hive+senrty权限命令(beeline).doc
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1、Column-level AuthorizationThe following command grants a role theSELECTprivilege on a column:GRANT SELECT(column_name) ON TABLE table_name TO ROLE role_name;The following command can be used to revoke theSELECTprivilege on a column:REVOKE SELECT(column_name) ON TABLE table_name FROM ROLE role_name;A
2、ny new columns added to a table will be inaccessible by default, until explicitly granted access.Actions allowed for users with SELECT privilege on a column:Users whose roles have been granted theSELECTprivilege on columns only, can perform operations which explicitly refer to those columns. Some ex
3、amples are: SELECT column_name FROM TABLE table_name;In this case, Sentry will first check to see if the user has the required privileges to access the table. It will then further check to see whether the user has theSELECTprivilege to access the column(s). SELECT COUNT(column_name) FROM TABLE table
4、_name;Users are also allowed to use theCOUNTfunction to return the number of values in the column. SELECT column_name FROM TABLE table_name WHERE column_name GROUP BY column_name; The above command will work as long as you refer only to columns to which you already have access. To list the column(s)
5、 to which the current user hasSELECTaccess:SHOW COLUMNS;Exceptions: If a user hasSELECTaccess to all columns in a table, the following command will work. Note that this is an exception, not the norm. In all other cases,SELECTon all columns doesnotallow you to perform table-level operations.SELECT *
6、FROM TABLE table_name; TheDESCRIBEtable command differs from the others, in that it does not filter out columns for which the user does not haveSELECTaccess.DESCRIBE (table_name);Limitations: Column-level privileges can only be applied to tables and partitions, not views. HDFS-Sentry Sync:With HDFS-
7、Sentry sync enabled, even if a user has been granted access to all columns of a table, they will not have access to the corresponding HDFS data files. This is because Sentry does not considerSELECTon all columns equivalent to explicitly being grantedSELECTon the table. Column-level access control fo
8、r access from Spark SQL is not supported by the HDFS-Sentry plug-in.CREATE ROLE StatementTheCREATE ROLEstatement creates a role to which privileges can be granted. Privileges can be granted to roles, which can then be assigned to users. A user that has been assigned a role will only be able to exerc
9、ise the privileges of that role.Only users that have administrative privileges can create/drop roles. By default, thehive,impalaandhueusers have admin privileges in Sentry.CREATE ROLE role_name;DROP ROLE StatementTheDROP ROLEstatement can be used to remove a role from the database. Once dropped, the
10、 role will be revoked for all users to whom it was previously assigned. Queries that are already executing will not be affected. However, since Hive checks user privileges before executing each query, active user sessions in which the role has already been enabled will be affected.DROP ROLE role_nam
11、e;GRANT ROLE StatementTheGRANT ROLEstatement can be used to grant roles to groups. Only Sentry admin users can grant roles to a group.GRANT ROLE role_name , role_name TO GROUP ,GROUP REVOKE ROLE StatementTheREVOKE ROLEstatement can be used to revoke roles from groups. Only Sentry admin users can rev
12、oke the role from a group.REVOKE ROLE role_name , role_name FROM GROUP ,GROUP GRANT StatementIn order to grant privileges on an object to a role, the user must be a Sentry admin user.GRANT , ON TO ROLE ,ROLE you can grant theSELECTprivilege on specific columns of a table. For example:GRANT SELECT(co
13、lumn_name) ON TABLE table_name TO ROLE role_name;REVOKE StatementSince only authorized admin users can create roles, consequently only Sentry admin users can revoke privileges from a group.REVOKE , ON FROM ROLE ,ROLE You can also revoke any previously-grantedSELECTprivileges on specific columns of a
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