spring mvc url匹配禁用后缀访问操作

在spring mvc中默认 访问url 加任意后缀名都能访问

比如：你想访问 /login ，但是通过 /login.do /login.action /login.json 都能访问

通常来说可能没有影响，但对于权限控制，这就严重了。

允许所有url通过，仅对个别重要的url做权限控制。此种方式比较简单，不需要对所有url资源进行配置，只配置重要的资源。

默认禁止所有url请求通过，仅开放授权的资源。此种方式对所有的url资源进行控制。在系统种需要整理所有的请求，或者某一目录下所有的url资源。这种方式安全控制比较严格，操作麻烦，但相对安全。

如果用第二种方式，则上面spring mvc的访问策略对安全没有影响。

但如果用第一种安全策略，则会有很大的安全风险。

例如：我们控制了/login 的访问，但是我们默认除/login的资源不受权限控制约束，那么攻击者就可以用 /login.do /login.xxx 来访问我们的资源。

在spring 3.1之后，url找对应方法的处理步骤，第一步，直接调用RequestMappingHandlerMapping查找到相应的处理方法，第二步，调用RequestMappingHandlerAdapter进行处理

我们在RequestMappingHandlerMapping中可以看到

/** * Whether to use suffix pattern match for registered file extensions only * when matching patterns to requests. * <p>If enabled, a controller method mapped to '/users' also matches to * '/users.json' assuming '.json' is a file extension registered with the * provided {@link #setContentNegotiationManager(ContentNegotiationManager) * contentNegotiationManager}. This can be useful for allowing only specific * URL extensions to be used as well as in cases where a '.' in the URL path * can lead to ambiguous interpretation of path variable content, (e.g. given * '/users/{user}' and incoming URLs such as '/users/john.j.joe' and * '/users/john.j.joe.json'). * <p>If enabled, this flag also enables * {@link #setUseSuffixPatternMatch(boolean) useSuffixPatternMatch}. The * default value is {@code false}. */public void setUseRegisteredSuffixPatternMatch(boolean useRegisteredSuffixPatternMatch) { this.useRegisteredSuffixPatternMatch = useRegisteredSuffixPatternMatch; this.useSuffixPatternMatch = (useRegisteredSuffixPatternMatch || this.useSuffixPatternMatch);}

那么如何来配置呢？

<mvc:annotation-driven> <mvc:path-matching suffix-pattern='false' /> </mvc:annotation-driven>

在匹配模式时是否使用后缀模式匹配，默认值为true。这样你想访问 /login ，通过 /login.* 就不能访问了。

RequestMappingInfoHandlerMapping 在处理http请求的时候， 如果 请求url 有后缀，如果找不到精确匹配的那个@RequestMapping方法。

那么，就把后缀去掉，然后.* 去匹配，这样，一般都可以匹配。 比如有一个@RequestMapping('/rest'), 那么精确匹配的情况下， 只会匹配/rest请求。

但如果我前端发来一个 /rest.abcdef 这样的请求， 又没有配置 @RequestMapping('/rest.abcdef') 这样映射的情况下， 那么@RequestMapping('/rest') 就会生效。

at org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getMatchingPattern(PatternsRequestCondition.java:254)at org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getMatchingPatterns(PatternsRequestCondition.java:230)at org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getMatchingCondition(PatternsRequestCondition.java:210)at org.springframework.web.servlet.mvc.method.RequestMappingInfo.getMatchingCondition(RequestMappingInfo.java:214)at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:79)at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:56)at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.addMatchingMappings(AbstractHandlerMethodMapping.java:358)at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:328)at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:299)at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:57)at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:299)at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1104)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:916)关键是PatternsRequestCondition， 具体来说是这个方法：

AbstractHandlerMethodMapping 的getHandlerInternal： protected HandlerMethod getHandlerInternal(HttpServletRequest request) throws Exception {String lookupPath = this.getUrlPathHelper().getLookupPathForRequest(request);if (this.logger.isDebugEnabled()) { this.logger.debug('Looking up handler method for path ' + lookupPath);}HandlerMethod handlerMethod = this.lookupHandlerMethod(lookupPath, request);// 这里是关键，它去寻找，找到了就找到了，找不到就不会再去寻找了if (this.logger.isDebugEnabled()) { if (handlerMethod != null) {this.logger.debug('Returning handler method [' + handlerMethod + ']'); } else {this.logger.debug('Did not find handler method for [' + lookupPath + ']'); }}return handlerMethod != null ? handlerMethod.createWithResolvedBean() : null; } protected HandlerMethod lookupHandlerMethod(String lookupPath, HttpServletRequest request) throws Exception {List<AbstractHandlerMethodMapping<T>.Match> matches = new ArrayList();List<T> directPathMatches = (List)this.urlMap.get(lookupPath); // directPathMatches， 直接匹配， 也可以说是 精确匹配if (directPathMatches != null) { this.addMatchingMappings(directPathMatches, matches, request);// 如果能够精确匹配， 就会进来这里}if (matches.isEmpty()) { this.addMatchingMappings(this.handlerMethods.keySet(), matches, request);// 如果无法精确匹配， 就会进来这里}if (!matches.isEmpty()) { Comparator<AbstractHandlerMethodMapping<T>.Match> comparator = new AbstractHandlerMethodMapping.MatchComparator(this.getMappingComparator(request)); Collections.sort(matches, comparator); if (this.logger.isTraceEnabled()) {this.logger.trace('Found ' + matches.size() + ' matching mapping(s) for [' + lookupPath + '] : ' + matches); } AbstractHandlerMethodMapping<T>.Match bestMatch = (AbstractHandlerMethodMapping.Match)matches.get(0); if (matches.size() > 1) {AbstractHandlerMethodMapping<T>.Match secondBestMatch = (AbstractHandlerMethodMapping.Match)matches.get(1);if (comparator.compare(bestMatch, secondBestMatch) == 0) { Method m1 = bestMatch.handlerMethod.getMethod(); Method m2 = secondBestMatch.handlerMethod.getMethod(); throw new IllegalStateException('Ambiguous handler methods mapped for HTTP path ’' + request.getRequestURL() + '’: {' + m1 + ', ' + m2 + '}');} } this.handleMatch(bestMatch.mapping, lookupPath, request); return bestMatch.handlerMethod;} else { return this.handleNoMatch(this.handlerMethods.keySet(), lookupPath, request);} }public List<String> getMatchingPatterns(String lookupPath) {List<String> matches = new ArrayList();Iterator var3 = this.patterns.iterator();while(var3.hasNext()) { String pattern = (String)var3.next(); // pattern 是 @RequestMapping 提供的映射 String match = this.getMatchingPattern(pattern, lookupPath); // lookupPath + .* 后能够匹配pattern， 那么就不为空 if (match != null) {matches.add(match);// 对于有后缀的情况， .* 后 }}Collections.sort(matches, this.pathMatcher.getPatternComparator(lookupPath));return matches; } 最关键是这里 getMatchingPatterns ： private String getMatchingPattern(String pattern, String lookupPath) {if (pattern.equals(lookupPath)) { return pattern;} else { if (this.useSuffixPatternMatch) {if (!this.fileExtensions.isEmpty() && lookupPath.indexOf(46) != -1) { Iterator var5 = this.fileExtensions.iterator(); while(var5.hasNext()) {String extension = (String)var5.next();if (this.pathMatcher.match(pattern + extension, lookupPath)) { return pattern + extension;} }} else { boolean hasSuffix = pattern.indexOf(46) != -1; if (!hasSuffix && this.pathMatcher.match(pattern + '.*', lookupPath)) {return pattern + '.*'; // 关键是这里 }} } if (this.pathMatcher.match(pattern, lookupPath)) {return pattern; } else {return this.useTrailingSlashMatch && !pattern.endsWith('/') && this.pathMatcher.match(pattern + '/', lookupPath) ? pattern + '/' : null; }} }

而对于AbstractUrlHandlerMapping ，匹配不上就是匹配不上， 不会进行 +.* 后在匹配。

protected Object lookupHandler(String urlPath, HttpServletRequest request) throws Exception {Object handler = this.handlerMap.get(urlPath);if (handler != null) { if (handler instanceof String) {String handlerName = (String)handler;handler = this.getApplicationContext().getBean(handlerName); } this.validateHandler(handler, request); return this.buildPathExposingHandler(handler, urlPath, urlPath, (Map)null);} else { List<String> matchingPatterns = new ArrayList(); Iterator var5 = this.handlerMap.keySet().iterator(); while(var5.hasNext()) {String registeredPattern = (String)var5.next();if (this.getPathMatcher().match(registeredPattern, urlPath)) { matchingPatterns.add(registeredPattern);} } String bestPatternMatch = null; Comparator<String> patternComparator = this.getPathMatcher().getPatternComparator(urlPath); if (!matchingPatterns.isEmpty()) {Collections.sort(matchingPatterns, patternComparator);if (this.logger.isDebugEnabled()) { this.logger.debug('Matching patterns for request [' + urlPath + '] are ' + matchingPatterns);}bestPatternMatch = (String)matchingPatterns.get(0); } if (bestPatternMatch != null) {handler = this.handlerMap.get(bestPatternMatch);String pathWithinMapping;if (handler instanceof String) { pathWithinMapping = (String)handler; handler = this.getApplicationContext().getBean(pathWithinMapping);}this.validateHandler(handler, request);pathWithinMapping = this.getPathMatcher().extractPathWithinPattern(bestPatternMatch, urlPath);Map<String, String> uriTemplateVariables = new LinkedHashMap();Iterator var9 = matchingPatterns.iterator();while(var9.hasNext()) { String matchingPattern = (String)var9.next(); if (patternComparator.compare(bestPatternMatch, matchingPattern) == 0) {Map<String, String> vars = this.getPathMatcher().extractUriTemplateVariables(matchingPattern, urlPath);Map<String, String> decodedVars = this.getUrlPathHelper().decodePathVariables(request, vars);uriTemplateVariables.putAll(decodedVars); }}if (this.logger.isDebugEnabled()) { this.logger.debug('URI Template variables for request [' + urlPath + '] are ' + uriTemplateVariables);}return this.buildPathExposingHandler(handler, bestPatternMatch, pathWithinMapping, uriTemplateVariables); } else {return null; }} }

当然， 或许我们可以设置自定义的PathMatcher ，从而到达目的。 默认的 是AntPathMatcher 。

以上为个人经验，希望能给大家一个参考，也希望大家多多支持好吧啦网。