引入了Shiro的项目请求路径中带有中文报错400的问题
by emanjusaka from https://www.emanjusaka.top/2024/04/shiro-request-chinese-error-400 彼岸花开可奈何
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当我们的项目中引入了 Shiro 后,带有中文的请求路径会被拦截并返回 400 的错误。一般我们的请求路径是不会带有中文字符,但当我们访问静态资源时那些文件是有可能是中文名称的。比如通过 SpringBoot 的静态资源映射预览上传的图片,这些上传的图片名称就可能是中文的。在没有引入 Shiro 的项目中是可以正常预览的,但引入了 Shiro 的项目中预览这些文件时就会遇到报错 400 的问题。
造成错误的原因
造成这个问题的是原因是 Shiro 有一个全局的拦截器InvalidRequestFilter
,它会检查请求的路径是否合法,如果不合法就会阻止该请求进一步处理并返回 400 的错误。带有中文的请求路径正是它认为不合法的情况之一。该请求过滤器在请求 URI 中发现以下字符都会认为其不合法并阻止该请求:
分号:可以通过设置 blockSemicolon = false 来禁用
反斜杠:可以通过设置blockBackslash = false 来禁用
非ascii字符-可以通过设置blockNonAscii = false来禁用,禁用此检查的功能将在将来的版本中删除。
路径遍历-可以通过设置blockTraversal = false来禁用
检查的路径
@Override
protected boolean isAccessAllowed(ServletRequest req, ServletResponse response, Object mappedValue) throws Exception {
HttpServletRequest request = WebUtils.toHttp(req);
// check the original and decoded values
return isValid(request.getRequestURI()) // user request string (not decoded)
&& isValid(request.getServletPath()) // decoded servlet part
&& isValid(request.getPathInfo()); // decoded path info (may be null)
}
它会检查请求的各个组成部分,包括原始请求 URI、解码后的 servlet 路径和解码后的路径信息是否符合特定的规则或格式。也就是是否包含分号、反斜杠、非 ascii 字符和路径遍历,如果包含这些东西的某一个都表明是不合法的,isAccessAllowed方法就会返回 false,从而阻止此次请求的进一步处理。
requestURI、servletPath 和 pathInfo 的区别
HttpServletRequest 类中的 getRequestURI()、getServletPath() 和 getPathInfo() 这三个方法分别提供了不同层次的请求路径信息:
request.getRequestURI()
: 返回的是客户端发送的完整请求URI,也就是请求行中的请求资源部分,不包含协议、主机名和端口号,但包括查询参数(如果有)。示例:如果请求是 https://www.emanjusaka.top/context-path/some/path?param=value,则 getRequestURI() 返回 /context-path/some/path?param=value。request.getServletPath()
: 返回的是匹配到当前Servlet的路径部分,这部分路径是根据web.xml或Spring MVC的@RequestMapping注解等配置确定的。 示例:如果请求是 https://www.emanjusaka.top/context-path/my-app/some/path,假设 /my-app/* 匹配到了一个Servlet,则 getServletPath() 返回 /my-app/some(具体值取决于Servlet映射配置)。request.getPathInfo()
: 返回的是请求URI中除Servlet路径之外的部分,这部分被称为路径信息(Path Info),通常包含匹配Servlet之后剩余的具体资源路径。 继续上面的示例,对于请求 https://www.emanjusaka.top/context-path/my-app/some/path,getPathInfo() 返回 /path,因为 /some/path 超出了 /my-app/* 的Servlet映射,/some 是Servlet路径,而 /path 是额外的路径信息。
总结起来,getRequestURI()
是整个请求资源路径,包括可能存在的查询参数;getServletPath()
是匹配到的Servlet路径;而 getPathInfo()
是请求资源路径中超出Servlet映射的那一部分。
解决方案
下面给出两种解决方案:
通过设置
blockNonAscii = false
来禁用中文字符不合法的检查(现版本生效的解决方案,可能会在以后的某个版本失效)通过自定义过滤器替换掉
InvalidRequestFilter
来让中文字符通过合法检查
方案一:
@Configuration
@Slf4j
public class ShiroConfig {
@Bean
public InvalidRequestFilter invalidRequestFilter() {
InvalidRequestFilter invalidRequestFilter = new InvalidRequestFilter();
invalidRequestFilter.setBlockNonAscii(false);
return invalidRequestFilter;
}
@Bean
public ShiroFilterFactoryBean shiroFilterFactoryBean(SecurityManager securityManager) {
ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
shiroFilterFactoryBean.setSecurityManager(securityManager);
Map<String, String> map = new LinkedHashMap<>();
//登出
map.put("/logout", "logout");
//登录
map.put("/login/**", "anon");
//对所有用户认证
map.put("/**", "authc");
//登录
shiroFilterFactoryBean.setLoginUrl(loginUrl);
//首页
shiroFilterFactoryBean.setSuccessUrl("/index");
//错误页面,认证不通过跳转
shiroFilterFactoryBean.setUnauthorizedUrl("/error");
shiroFilterFactoryBean.setFilterChainDefinitionMap(map);
HashMap<String, Filter> filterMap = new LinkedHashMap<>();
filterMap.put("invalidRequest", invalidRequestFilter());
shiroFilterFactoryBean.setFilters(filterMap);
return shiroFilterFactoryBean;
}
//... 省略其他配置
}
方案二:
自定义的 CNInvalidRequestFilter,把 InvalidRequestFilter 的代码复制了过来,只修改其中一小部分,在不影响原始功能的情况下,让中文字符的请求路径通过检查。
package top.emanjusaka.filter;
import org.apache.shiro.web.filter.AccessControlFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;
@Component
public class CNInvalidRequestFilter extends AccessControlFilter {
private static final List<String> SEMICOLON = Collections.unmodifiableList(Arrays.asList(";", "%3b", "%3B"));
private static final List<String> BACKSLASH = Collections.unmodifiableList(Arrays.asList("\\", "%5c", "%5C"));
private boolean blockSemicolon = true;
private boolean blockBackslash = !Boolean.getBoolean("org.apache.shiro.web.ALLOW_BACKSLASH");
private boolean blockNonAscii = true;
protected boolean isAccessAllowed(ServletRequest req, ServletResponse response, Object mappedValue) throws Exception {
HttpServletRequest request = WebUtils.toHttp(req);
return this.isValid(request.getRequestURI()) && this.isValid(request.getServletPath()) && this.isValid(request.getPathInfo());
}
private boolean isValid(String uri) {
return !StringUtils.hasText(uri) || !this.containsSemicolon(uri) && !this.containsBackslash(uri) && !this.containsNonAsciiCharacters(uri);
}
protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
WebUtils.toHttp(response).sendError(400, "Invalid request");
return false;
}
private boolean containsSemicolon(String uri) {
if (this.isBlockSemicolon()) {
Stream<String> var10000 = SEMICOLON.stream();
Objects.requireNonNull(uri);
return var10000.anyMatch(uri::contains);
} else {
return false;
}
}
private boolean containsBackslash(String uri) {
if (this.isBlockBackslash()) {
Stream<String> var10000 = BACKSLASH.stream();
Objects.requireNonNull(uri);
return var10000.anyMatch(uri::contains);
} else {
return false;
}
}
private boolean containsNonAsciiCharacters(String uri) {
if (this.isBlockNonAscii()) {
return !containsOnlyPrintableAsciiCharacters(uri);
} else {
return false;
}
}
private boolean isChinese(char c) {
Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
return ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION;
}
private boolean containsOnlyPrintableAsciiCharacters(String uri) {
int length = uri.length();
for (int i = 0; i < length; ++i) {
char c = uri.charAt(i);
if ((c < ' ' || c > '~') && !isChinese(c)) {
return false;
}
}
return true;
}
public boolean isBlockSemicolon() {
return this.blockSemicolon;
}
public void setBlockSemicolon(boolean blockSemicolon) {
this.blockSemicolon = blockSemicolon;
}
public boolean isBlockBackslash() {
return this.blockBackslash;
}
public void setBlockBackslash(boolean blockBackslash) {
this.blockBackslash = blockBackslash;
}
public boolean isBlockNonAscii() {
return this.blockNonAscii;
}
public void setBlockNonAscii(boolean blockNonAscii) {
this.blockNonAscii = blockNonAscii;
}
}
配置自定义的过滤器到 shiro 中
@Configuration
@Slf4j
public class ShiroConfig {
@Bean
public ShiroFilterFactoryBean shiroFilterFactoryBean(SecurityManager securityManager) {
ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
shiroFilterFactoryBean.setSecurityManager(securityManager);
Map<String, String> map = new LinkedHashMap<>();
//登出
map.put("/logout", "logout");
//登录
map.put("/login/**", "anon");
//对所有用户认证
map.put("/**", "authc");
//登录
shiroFilterFactoryBean.setLoginUrl(loginUrl);
//首页
shiroFilterFactoryBean.setSuccessUrl("/index");
//错误页面,认证不通过跳转
shiroFilterFactoryBean.setUnauthorizedUrl("/error");
shiroFilterFactoryBean.setFilterChainDefinitionMap(map);
HashMap<String, Filter> filterMap = new LinkedHashMap<>();
filterMap.put("invalidRequest", new CNInvalidRequestFilter());
shiroFilterFactoryBean.setFilters(filterMap);
return shiroFilterFactoryBean;
}
//... 省略其他配置
}
参考资料
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原文地址: https://www.emanjusaka.top/2024/04/shiro-request-chinese-error-400
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