XssFilter EscapeUtil
2024-10-08 16:22:03
package com.ruoyi.framework.config; import java.util.HashMap;
import java.util.Map;
import javax.servlet.DispatcherType;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.xss.XssFilter; /**
* Filter配置
*
* @author ruoyi
*/
@Configuration
public class FilterConfig
{
@Value("${xss.enabled}")
private String enabled; @Value("${xss.excludes}")
private String excludes; @Value("${xss.urlPatterns}")
private String urlPatterns; @SuppressWarnings({ "rawtypes", "unchecked" })
@Bean
public FilterRegistrationBean xssFilterRegistration()
{
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setDispatcherTypes(DispatcherType.REQUEST);
registration.setFilter(new XssFilter());
registration.addUrlPatterns(StringUtils.split(urlPatterns, ","));
registration.setName("xssFilter");
registration.setOrder(Integer.MAX_VALUE);
Map<String, String> initParameters = new HashMap<String, String>();
initParameters.put("excludes", excludes);
initParameters.put("enabled", enabled);
registration.setInitParameters(initParameters);
return registration;
}
}
applicati.yml
# 防止XSS攻击
xss:
# 过滤开关
enabled: true
# 排除链接（多个用逗号分隔）
excludes: /system/notice/*
# 匹配链接
urlPatterns: /system/*,/monitor/*,/tool/*
package com.ruoyi.common.xss; import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.ruoyi.common.utils.StringUtils; /**
* 防止XSS攻击的过滤器
*
* @author ruoyi
*/
public class XssFilter implements Filter
{
/**
* 排除链接
*/
public List<String> excludes = new ArrayList<>(); /**
* xss过滤开关
*/
public boolean enabled = false; @Override
public void init(FilterConfig filterConfig) throws ServletException
{
String tempExcludes = filterConfig.getInitParameter("excludes");
String tempEnabled = filterConfig.getInitParameter("enabled");
if (StringUtils.isNotEmpty(tempExcludes))
{
String[] url = tempExcludes.split(",");
for (int i = 0; url != null && i < url.length; i++)
{
excludes.add(url[i]);
}
}
if (StringUtils.isNotEmpty(tempEnabled))
{
enabled = Boolean.valueOf(tempEnabled);
}
} @Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
{
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
if (handleExcludeURL(req, resp))
{
chain.doFilter(request, response);
return;
}
XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request);
chain.doFilter(xssRequest, response);
} private boolean handleExcludeURL(HttpServletRequest request, HttpServletResponse response)
{
if (!enabled)
{
return true;
}
if (excludes == null || excludes.isEmpty())
{
return false;
}
String url = request.getServletPath();
for (String pattern : excludes)
{
Pattern p = Pattern.compile("^" + pattern);
Matcher m = p.matcher(url);
if (m.find())
{
return true;
}
}
return false;
} @Override
public void destroy()
{ }
}
package com.ruoyi.common.xss; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import com.ruoyi.common.utils.html.EscapeUtil; /**
* XSS过滤处理
*
* @author ruoyi
*/
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper
{
/**
* @param request
*/
public XssHttpServletRequestWrapper(HttpServletRequest request)
{
super(request);
} @Override
public String[] getParameterValues(String name)
{
String[] values = super.getParameterValues(name);
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] = EscapeUtil.clean(values[i]).trim();
}
return escapseValues;
}
return super.getParameterValues(name);
}
}
package com.ruoyi.common.utils.html; import com.ruoyi.common.utils.StringUtils; /**
* 转义和反转义工具类
*
* @author ruoyi
*/
public class EscapeUtil
{
public static final String RE_HTML_MARK = "(<[^<]*?>)|(<[\\s]*?/[^<]*?>)|(<[^<]*?/[\\s]*?>)"; private static final char[][] TEXT = new char[64][]; static
{
for (int i = 0; i < 64; i++)
{
TEXT[i] = new char[] { (char) i };
} // special HTML characters
TEXT['\''] = "'".toCharArray(); // 单引号
TEXT['"'] = """.toCharArray(); // 单引号
TEXT['&'] = "&".toCharArray(); // &符
TEXT['<'] = "<".toCharArray(); // 小于号
TEXT['>'] = ">".toCharArray(); // 大于号
} /**
* 转义文本中的HTML字符为安全的字符
*
* @param text 被转义的文本
* @return 转义后的文本
*/
public static String escape(String text)
{
return encode(text);
} /**
* 还原被转义的HTML特殊字符
*
* @param content 包含转义符的HTML内容
* @return 转换后的字符串
*/
public static String unescape(String content)
{
return decode(content);
} /**
* 清除所有HTML标签，但是不删除标签内的内容
*
* @param content 文本
* @return 清除标签后的文本
*/
public static String clean(String content)
{
return content.replaceAll(RE_HTML_MARK, "");
} /**
* Escape编码
*
* @param text 被编码的文本
* @return 编码后的字符
*/
private static String encode(String text)
{
int len;
if ((text == null) || ((len = text.length()) == 0))
{
return StringUtils.EMPTY;
}
StringBuilder buffer = new StringBuilder(len + (len >> 2));
char c;
for (int i = 0; i < len; i++)
{
c = text.charAt(i);
if (c < 64)
{
buffer.append(TEXT[c]);
}
else
{
buffer.append(c);
}
}
return buffer.toString();
} /**
* Escape解码
*
* @param content 被转义的内容
* @return 解码后的字符串
*/
public static String decode(String content)
{
if (StringUtils.isEmpty(content))
{
return content;
} StringBuilder tmp = new StringBuilder(content.length());
int lastPos = 0, pos = 0;
char ch;
while (lastPos < content.length())
{
pos = content.indexOf("%", lastPos);
if (pos == lastPos)
{
if (content.charAt(pos + 1) == 'u')
{
ch = (char) Integer.parseInt(content.substring(pos + 2, pos + 6), 16);
tmp.append(ch);
lastPos = pos + 6;
}
else
{
ch = (char) Integer.parseInt(content.substring(pos + 1, pos + 3), 16);
tmp.append(ch);
lastPos = pos + 3;
}
}
else
{
if (pos == -1)
{
tmp.append(content.substring(lastPos));
lastPos = content.length();
}
else
{
tmp.append(content.substring(lastPos, pos));
lastPos = pos;
}
}
}
return tmp.toString();
} public static void main(String[] args)
{
String html = "<script>alert(1);</script>";
System.out.println(EscapeUtil.clean(html));
System.out.println(EscapeUtil.escape(html));
System.out.println(EscapeUtil.unescape(html));
}
}
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