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Spring Boot配置XSS_springboot3 xss
作者：煮酒与君饮 | 2024-08-03 05:13:57
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springboot3 xss
一、导入pom依赖
<!--常用工具类 --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.8.1</version> </dependency> <!--web环境--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- servlet包 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> </dependency>
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二、改yml、properties
# 防止XSS攻击
# 过滤开关
xss.enabled=true
# 排除链接（多个用逗号分隔）
xss.excludes=/index,/index/1/*
# 匹配链接（多个用逗号分隔）
xss.urlPatterns=/login
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三、配置config
/** * @author lihua * @date 2023/2/21 11:22 * 过滤器配置 **/ @Configuration //这个配置属性的值为：true @ConditionalOnProperty(value = "xss.enabled", havingValue = "true") public class FilterConfig { /** * xss排除路径 */ @Value("${xss.excludes}") private String excludes; /** * xss匹配路径 */ @Value("${xss.urlPatterns}") private String urlPatterns; @SuppressWarnings({ "rawtypes", "unchecked" }) @Bean public FilterRegistrationBean xssFilterRegistration() { FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setDispatcherTypes(DispatcherType.REQUEST); //设置过滤器 registration.setFilter(new XssFilter()); //添加需要过滤器处理的路径 registration.addUrlPatterns(StringUtils.split(urlPatterns, ",")); registration.setName("xssFilter"); registration.setOrder(FilterRegistrationBean.HIGHEST_PRECEDENCE); Map<String, String> initParameters = new HashMap<>(); //将excludes的内容放入FilterConfig配置容器中，通过filterConfig.getInitParameter("excludes");获取值 initParameters.put("excludes", excludes); registration.setInitParameters(initParameters); return registration; } }
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四、配置xss
（一）配置XSS过滤器
/** * @author lihua * @date 2023/2/21 11:49 * 配置XSS过滤器 **/ public class XssFilter implements Filter { /** * 排除链接 */ public List<String> excludes = new ArrayList<>(); /** * init初始化方法在系统启动前运行 */ @Override public void init(FilterConfig filterConfig) throws ServletException { //获取FilterConfig中配置的排除项 String tempExcludes = filterConfig.getInitParameter("excludes"); if (StringUtils.isNotEmpty(tempExcludes)) { String[] url = tempExcludes.split(","); Collections.addAll(excludes, url); } } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse resp = (HttpServletResponse) response; //排除url处理逻辑 if (handleExcludeURL(req, resp)) { chain.doFilter(request, response); return; } //XSS处理策略 XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request); chain.doFilter(xssRequest, response); } /** * 排除url处理逻辑 * @param request * @param response * @return */ private boolean handleExcludeURL(HttpServletRequest request, HttpServletResponse response) { String url = request.getServletPath(); String method = request.getMethod(); // GET DELETE 不过滤 // if (method == null || method.matches("GET") || method.matches("DELETE")) { // return true; // } return matches(url, excludes); } @Override public void destroy() { } /** * 查找指定字符串是否匹配指定字符串列表中的任意一个字符串 * * @param str 指定字符串 * @param strs 需要检查的字符串数组 * @return 是否匹配 */ public static boolean matches(String str, List<String> strs) { AntPathMatcher antPathMatcher = new AntPathMatcher(); if (Objects.isNull(str) || str.isEmpty() || Objects.isNull(strs) || strs.isEmpty()) { return false; } for (String pattern : strs) { if (antPathMatcher.match(pattern, str)) { return true; } } return false; } }
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（二） Xss攻击处理策略
/** * @author lihua * @date 2023/2/21 13:49 * Xss攻击处理策略 **/ public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper { @Override public String[] getParameterValues(String name) { String[] values = super.getParameterValues(name); HTMLFilter htmlFilter = new HTMLFilter(); if (values != null) { int length = values.length; String[] escapseValues = new String[length]; for (int i = 0; i < length; i++) { // 防xss攻击和过滤前后空格 escapseValues[i] = htmlFilter.filter(values[i]).trim(); } return escapseValues; } return super.getParameterValues(name); } /** * Constructs a request object wrapping the given request. * * @param request The request to wrap * @throws IllegalArgumentException if the request is null */ public XssHttpServletRequestWrapper(HttpServletRequest request) { super(request); } }
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（三）对请求数据包含的html、js、css内容过滤
/** * HTML过滤器，用于去除XSS漏洞隐患。 * * @author ruoyi */ 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<>(); private static final ConcurrentMap<String, Pattern> P_REMOVE_SELF_BLANKS = new ConcurrentHashMap<>(); /** * 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<>(); /** * 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; /** * 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<>(); a_atts.add("href"); a_atts.add("target"); vAllowed.put("a", a_atts); final ArrayList<String> img_atts = new ArrayList<>(); 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<>(); 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 = false; } /** * Map-parameter configurable constructor. * * @param conf map containing configuration. keys match field names. */ @SuppressWarnings("unchecked") 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 conf.containsKey("vRemoveBlanks") : "configuration requires vRemoveBlanks"; assert conf.containsKey("vAllowedEntities") : "configuration requires vAllowedEntities"; vAllowed = Collections.unmodifiableMap((HashMap<String, List<String>>) conf.get("vAllowed")); vSelfClosingTags = (String[]) conf.get("vSelfClosingTags"); vNeedClosingTags = (String[]) conf.get("vNeedClosingTags"); vDisallowed = (String[]) conf.get("vDisallowed"); vAllowedProtocols = (String[]) conf.get("vAllowedProtocols"); vProtocolAtts = (String[]) conf.get("vProtocolAtts"); vRemoveBlanks = (String[]) conf.get("vRemoveBlanks"); vAllowedEntities = (String[]) conf.get("vAllowedEntities"); stripComment = conf.containsKey("stripComment") ? (Boolean) conf.get("stripComment") : true; encodeQuotes = conf.containsKey("encodeQuotes") ? (Boolean) conf.get("encodeQuotes") : true; alwaysMakeTags = conf.containsKey("alwaysMakeTags") ? (Boolean) conf.get("alwaysMakeTags") : true; } private void reset() { vTagCounts.clear(); } // --------------------------------------------------------------- // my versions of some PHP library functions public static String chr(final int decimal) { return String.valueOf((char) decimal); } public static String htmlSpecialChars(final String s) { String result = s; result = regexReplace(P_AMP, "&", result); result = regexReplace(P_QUOTE, """, result); result = regexReplace(P_LEFT_ARROW, "<", result); result = regexReplace(P_RIGHT_ARROW, ">", result); return result; } // --------------------------------------------------------------- /** * given a user submitted input String, filter out any invalid or restricted html. * * @param input text (i.e. submitted by a user) than may contain html * @return "clean" version of input, with only valid, whitelisted html elements allowed */ public String filter(final String input) { reset(); String s = input; s = escapeComments(s); s = balanceHTML(s); s = checkTags(s); s = processRemoveBlanks(s); // s = validateEntities(s); return s; } public boolean isAlwaysMakeTags() { return alwaysMakeTags; } public boolean isStripComments() { return stripComment; } private String escapeComments(final String s) { final Matcher m = P_COMMENTS.matcher(s); final StringBuffer buf = new StringBuffer(); if (m.find()) { final String match = m.group(1); // (.*?) m.appendReplacement(buf, Matcher.quoteReplacement("<!--" + htmlSpecialChars(match) + "-->")); } m.appendTail(buf); return buf.toString(); } private String balanceHTML(String s) { if (alwaysMakeTags) { // // try and form html // s = regexReplace(P_END_ARROW, "", s); // 不追加结束标签 s = regexReplace(P_BODY_TO_END, "<$1>", s); s = regexReplace(P_XML_CONTENT, "$1<$2", s); } else { // // escape stray brackets // s = regexReplace(P_STRAY_LEFT_ARROW, "<$1", s); s = regexReplace(P_STRAY_RIGHT_ARROW, "$1$2><", s); // // the last regexp causes '<>' entities to appear // (we need to do a lookahead assertion so that the last bracket can // be used in the next pass of the regexp) // s = regexReplace(P_BOTH_ARROWS, "", s); } return s; } private String checkTags(String s) { Matcher m = P_TAGS.matcher(s); final StringBuffer buf = new StringBuffer(); while (m.find()) { String replaceStr = m.group(1); replaceStr = processTag(replaceStr); m.appendReplacement(buf, Matcher.quoteReplacement(replaceStr)); } m.appendTail(buf); // these get tallied in processTag // (remember to reset before subsequent calls to filter method) final StringBuilder sBuilder = new StringBuilder(buf.toString()); for (String key : vTagCounts.keySet()) { for (int ii = 0; ii < vTagCounts.get(key); ii++) { sBuilder.append("</").append(key).append(">"); } } s = sBuilder.toString(); return s; } private String processRemoveBlanks(final String s) { String result = s; for (String tag : vRemoveBlanks) { if (!P_REMOVE_PAIR_BLANKS.containsKey(tag)) { P_REMOVE_PAIR_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?></" + tag + ">")); } result = regexReplace(P_REMOVE_PAIR_BLANKS.get(tag), "", result); if (!P_REMOVE_SELF_BLANKS.containsKey(tag)) { P_REMOVE_SELF_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?/>")); } result = regexReplace(P_REMOVE_SELF_BLANKS.get(tag), "", result); } return result; } private static String regexReplace(final Pattern regex_pattern, final String replacement, final String s) { Matcher m = regex_pattern.matcher(s); return m.replaceAll(replacement); } private String processTag(final String s) { // ending tags Matcher m = P_END_TAG.matcher(s); if (m.find()) { final String name = m.group(1).toLowerCase(); if (allowed(name)) { if (false == inArray(name, vSelfClosingTags)) { if (vTagCounts.containsKey(name)) { vTagCounts.put(name, vTagCounts.get(name) - 1); return "</" + name + ">"; } } } } // starting tags m = P_START_TAG.matcher(s); if (m.find()) { final String name = m.group(1).toLowerCase(); final String body = m.group(2); String ending = m.group(3); // debug( "in a starting tag, name='" + name + "'; body='" + body + "'; ending='" + ending + "'" ); if (allowed(name)) { final StringBuilder params = new StringBuilder(); final Matcher m2 = P_QUOTED_ATTRIBUTES.matcher(body); final Matcher m3 = P_UNQUOTED_ATTRIBUTES.matcher(body); final List<String> paramNames = new ArrayList<>(); final List<String> paramValues = new ArrayList<>(); while (m2.find()) { paramNames.add(m2.group(1)); // ([a-z0-9]+) paramValues.add(m2.group(3)); // (.*?) } while (m3.find()) { paramNames.add(m3.group(1)); // ([a-z0-9]+) paramValues.add(m3.group(3)); // ([^\"\\s']+) } String paramName, paramValue; for (int ii = 0; ii < paramNames.size(); ii++) { paramName = paramNames.get(ii).toLowerCase(); paramValue = paramValues.get(ii); // debug( "paramName='" + paramName + "'" ); // debug( "paramValue='" + paramValue + "'" ); // debug( "allowed? " + vAllowed.get( name ).contains( paramName ) ); if (allowedAttribute(name, paramName)) { if (inArray(paramName, vProtocolAtts)) { paramValue = processParamProtocol(paramValue); } params.append(' ').append(paramName).append("=\"").append(paramValue).append("\""); } } if (inArray(name, vSelfClosingTags)) { ending = " /"; } if (inArray(name, vNeedClosingTags)) { ending = ""; } if (ending == null || ending.length() < 1) { if (vTagCounts.containsKey(name)) { vTagCounts.put(name, vTagCounts.get(name) + 1); } else { vTagCounts.put(name, 1); } } else { ending = " /"; } return "<" + name + params + ending + ">"; } else { return ""; } } // comments m = P_COMMENT.matcher(s); if (!stripComment && m.find()) { return "<" + m.group() + ">"; } return ""; } private String processParamProtocol(String s) { s = decodeEntities(s); final Matcher m = P_PROTOCOL.matcher(s); if (m.find()) { final String protocol = m.group(1); if (!inArray(protocol, vAllowedProtocols)) { // bad protocol, turn into local anchor link instead s = "#" + s.substring(protocol.length() + 1); if (s.startsWith("#//")) { s = "#" + s.substring(3); } } } return s; } private String decodeEntities(String s) { StringBuffer buf = new StringBuffer(); Matcher m = P_ENTITY.matcher(s); while (m.find()) { final String match = m.group(1); final int decimal = Integer.decode(match).intValue(); m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal))); } m.appendTail(buf); s = buf.toString(); buf = new StringBuffer(); m = P_ENTITY_UNICODE.matcher(s); while (m.find()) { final String match = m.group(1); final int decimal = Integer.valueOf(match, 16).intValue(); m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal))); } m.appendTail(buf); s = buf.toString(); buf = new StringBuffer(); m = P_ENCODE.matcher(s); while (m.find()) { final String match = m.group(1); final int decimal = Integer.valueOf(match, 16).intValue(); m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal))); } m.appendTail(buf); s = buf.toString(); s = validateEntities(s); return s; } private String validateEntities(final String s) { StringBuffer buf = new StringBuffer(); // validate entities throughout the string Matcher m = P_VALID_ENTITIES.matcher(s); while (m.find()) { final String one = m.group(1); // ([^&;]*) final String two = m.group(2); // (?=(;|&|$)) m.appendReplacement(buf, Matcher.quoteReplacement(checkEntity(one, two))); } m.appendTail(buf); return encodeQuotes(buf.toString()); } private String encodeQuotes(final String s) { if (encodeQuotes) { StringBuffer buf = new StringBuffer(); Matcher m = P_VALID_QUOTES.matcher(s); while (m.find()) { final String one = m.group(1); // (>|^) final String two = m.group(2); // ([^<]+?) final String three = m.group(3); // (<|$) // 不替换双引号为"，防止json格式无效 regexReplace(P_QUOTE, """, two) m.appendReplacement(buf, Matcher.quoteReplacement(one + two + three)); } m.appendTail(buf); return buf.toString(); } else { return s; } } private String checkEntity(final String preamble, final String term) { return ";".equals(term) && isValidEntity(preamble) ? '&' + preamble : "&" + preamble; } private boolean isValidEntity(final String entity) { return inArray(entity, vAllowedEntities); } private static boolean inArray(final String s, final String[] array) { for (String item : array) { if (item != null && item.equals(s)) { return true; } } return false; } private boolean allowed(final String name) { return (vAllowed.isEmpty() || vAllowed.containsKey(name)) && !inArray(name, vDisallowed); } private boolean allowedAttribute(final String name, final String paramName) { return allowed(name) && (vAllowed.isEmpty() || vAllowed.get(name).contains(paramName)); } }
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五、测试
/** * @author lihua * @date 2023/2/21 14:41 * 被XSS处理的url **/ @RestController public class LoginController { @RequestMapping("/login") public String index(String data){ return data; } } /** * @author lihua * @date 2023/2/21 14:41 * 没有被XSS处理的url **/ @RestController public class IndexController { @RequestMapping("/index") public String index(String data){ return data; } }
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测试链接。
http://localhost:8080/login?data=<script>console.log("1111")</script><h1>我的第一个标题</h1>
http://localhost:8080/index?data=<script>console.log("1111")</script><h1>我的第一个标题</h1>
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login请求结果：
index请求结果：
六、Springboot XSS过滤插件（mica-xss）
当然你也可以使用xss过滤插件处理xss攻击。Springboot XSS过滤插件（mica-xss）
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