最近在研究Hue,遇到一个问题,在HiveEditor写一个HQL,提交后会报权限错误,类似这样的Authorizationfailed:NoprivilegeSelectfoundforinputs&n..
最近在研究Hue,遇到一个问题,在Hive Editor写一个HQL,提交后会报权限错误,类似这样的
Authorization failed:No privilege 'Select' found for inputs {database:xxx, table:xxx, columnName:xxx}. Use show grant to get more details.
Hue的登录用户是hadoop,使用cli方式查询的时候,是没问题的,但是使用Hue连接HiveServer2的方式,就查询不了对应的表了,排除Hue的干扰,使用Beeline来连接HiveServer2,同样报权限的错误,堆栈信息如下图
根据堆栈信息大概梳理了下源码(只列出比较重要的代码),Hive提交SQL的权限验证流程如下
Driver.compile(String command, boolean resetTaskIds){
if (HiveConf.getBoolVar(conf,
HiveConf.ConfVars.HIVE_AUTHORIZATION_ENABLED)) {
try {
perfLogger.PerfLogBegin(LOG, PerfLogger.DO_AUTHORIZATION);
//进行权限校验
doAuthorization(sem);
}
}
Driver.doAuthorization(BaseSemanticAnalyzer sem){
//判断op的操作类型为QUERY
if (op.equals(HiveOperation.CREATETABLE_AS_SELECT)
|| op.equals(HiveOperation.QUERY)) {
if (cols != null && cols.size() > 0) {
//进行更具体的验证
ss.getAuthorizer().authorize(tbl, null, cols,
op.getInputRequiredPrivileges(), null);
}
}
}
BitSetCheckedAuthorizationProvider.authorize(Table table, Partition part, List
columns,Privilege[] inputRequiredPriv, Privilege[] outputRequiredPriv){
//验证用户对DB和Table的权限
authorizeUserDBAndTable(table, inputRequiredPriv, outputRequiredPriv,inputCheck,outputCheck)
//验证用户对Table中column的权限
for (String col : columns) {
PrincipalPrivilegeSet partColumnPrivileges = hive_db
.get_privilege_set(HiveObjectType.COLUMN, table.getDbName(),table.getTableName(),partValues, col,this.getAuthenticator().getUserName(), this.getAuthenticator().getGroupNames());
authorizePrivileges(partColumnPrivileges, inputRequiredPriv, inputCheck2,
outputRequiredPriv, outputCheck2);
}
} Hive的权限验证首先会调用authorizeUserDBAndTable验证用户是否对访问的DB和Table有访问权限,对应到MetaStore的DB_PRIVS和TBL_PRIVS表,在进行验证的时候,会通过thrift与HiveMetaStore进程进行交互来获取MetaStore库中对应表的相关信息。如果用户对更大粒度的资源有访问权限,则会直接返回,不会再继续进行更细粒度的验证,也就是说如果用户对DB有相关的权限,则不会继续验证对Table和Column的访问权限。
查看了下DB_PRIVS表,hadoop用户对访问的数据库是有Select权限的,所以再传统CLI模式下访问是没有问题的。看上述代码也都是在预料之中,因为实际上CLI模式和HiveServer模式的权限验证是一套代码。决定remote debug下,进而发现this.getAuthenticator().getUserName()的值为hive,也即是启动HiveServer2的用户,而不是提交SQL的用户hadoop,顺藤摸瓜,找到了设置authenticator相关属性的代码
SessionState.start(SessionState startSs) {
//实例化默认的HadoopDefaultAuthenticator,方法内部,,使用ReflectionUtils反射加载类的时候,进而调用了HadoopDefaultAuthenticator.setConf方法
startSs.authenticator=HiveUtils.getAuthenticator(startSs.getConf(),HiveConf.ConfVars.HIVE_AUTHENTICATOR_MANAGER);
}
HadoopDefaultAuthenticator.setConf(Configuration conf){
ugi = ShimLoader.getHadoopShims().getUGIForConf(conf);
}
HadoopShimsSecure.getUGIForConf(Configuration conf) throws IOException {
return UserGroupInformation.getCurrentUser();
}
UserGroupInformation.getCurrentUser() throws IOException {
AccessControlContext context = AccessController.getContext();
Subject subject = Subject.getSubject(context);
//HiveServer刚启动的时候,subject为空,调用getLoginUser
if (subject == null || subject.getPrincipals(User.class).isEmpty()) {
return getLoginUser();
} else {
return new UserGroupInformation(subject);
}
}
UserGroupInformation.getLoginUser() {
if (loginUser == null) {
try {
Subject subject = new Subject();
LoginContext login;
if (isSecurityEnabled()) {
login = newLoginContext(HadoopConfiguration.USER_KERBEROS_CONFIG_NAME,
subject, new HadoopConfiguration());
} else {
login = newLoginContext(HadoopConfiguration.SIMPLE_CONFIG_NAME,
subject, new HadoopConfiguration());
}
login.login();
loginUser = new UserGroupInformation(subject);
loginUser.setLogin(login);
loginUser.setAuthenticationMethod(isSecurityEnabled() ?
AuthenticationMethod.KERBEROS :
AuthenticationMethod.SIMPLE);
loginUser = new UserGroupInformation(login.getSubject());
String fileLocation = System.getenv(HADOOP_TOKEN_FILE_LOCATION);
if (fileLocation != null) {
Credentials cred = Credentials.readTokenStorageFile(
new File(fileLocation), conf);
loginUser.addCredentials(cred);
}
loginUser.spawnAutoRenewalThreadForUserCreds();
} catch (LoginException le) {
LOG.debug("failure to login", le);
throw new IOException("failure to login", le);
}
if (LOG.isDebugEnabled()) {
LOG.debug("UGI loginUser:"+loginUser);
}
}
return loginUser;
}