工程中使用了shiro，最近启动工程后通过接口访问就一直在报错，跟踪了一下源码，发现是cookie导致的。错误如下:
org.apache.shiro.crypto.CryptoException: Unable to correctly extract the Initialization Vector or ciphertext. at org.apache.shiro.crypto.JcaCipherService.decrypt(JcaCipherService.java:378) at org.apache.shiro.mgt.AbstractRememberMeManager.decrypt(AbstractRememberMeManager.java:489) at org.apache.shiro.mgt.AbstractRememberMeManager.convertBytesToPrincipals(AbstractRememberMeManager.java:429) at org.apache.shiro.mgt.AbstractRememberMeManager.getRememberedPrincipals(AbstractRememberMeManager.java:396) at org.apache.shiro.mgt.DefaultSecurityManager.getRememberedIdentity(DefaultSecurityManager.java:604) at org.apache.shiro.mgt.DefaultSecurityManager.resolvePrincipals(DefaultSecurityManager.java:492) at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:342) at org.apache.shiro.subject.Subject$Builder.buildSubject(Subject.java:846) at org.apache.shiro.web.subject.WebSubject$Builder.buildWebSubject(WebSubject.java:148) at org.apache.shiro.web.servlet.AbstractShiroFilter.createSubject(AbstractShiroFilter.java:292) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:359) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744) Caused by: java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native Method) at org.apache.shiro.crypto.JcaCipherService.decrypt(JcaCipherService.java:370) ... 35 more分析
public AbstractRememberMeManager() {
this.serializer = new DefaultSerializer();
AesCipherService cipherService = new AesCipherService();
this.cipherService = cipherService;
// 默认构造方法调用时，生成新的密钥
setCipherKey(cipherService.generateNewKey().getEncoded());
}
解决方案shiro底层有一个AbstractRememberMeManager的抽象实现，它是这个错误的罪魁祸首，服务端在接收cookie时,得到rememberMe的cookie值=>Base64解码=>AES解密=>反序列化(未限制）。
shiro≤1.2.4版本预设使CookieRememberMeManager,由于AES使用的key泄露,导致反序化的cookie可控，从而引发反序化攻击。而且AbstractRememberMeManager的构造方法中每次都会重新生成对称加密密钥，意味着每次重启工程都会重新生成一对加解密密钥。这就会导致第一次启动工程shiro使用A密钥加密了cookie，第二次启动工程shiro重新生成了密钥B，当用户访问页面时，shiro会用密钥B去解密上一次用密钥A加密的cookie，导致解密失敗，形成报错，所以这不影响使用者登入操作(rememberMe失效罢了)，所以这种异常只会在工程重启(shiro清除session)第一次开启页面的时候出现。
1.升级shiro版本，shiro>1.2.4之后这个问题有相应的解决措施。
2.配置固定密钥，这种方法不建议，容易泄露。
3.最简单的方式，直接删除浏览器cookie。
以谷歌浏览器为例，直接找到cookie进行删除即可。
shiro文档可参考: https://shiro.apache.org/web.html#Web-RememberMeServices
