Redshift security

Introduction to Redshift

Jason Myers

Principal Engineer

Redshift security

Column level access control
Row level security via policies
Data masking via policies

Redshift Security Portfolio

Column level permissions

Hides a column completely
Can verify via SVV_COLUMN_PRIVILEGES

SELECT *
  FROM SVV_COLUMN_PRIVILEGES
 WHERE relation_name = 'products';

relation_name | column_name  | privilege_type | identity_name | identity_type
==============|==============|================|===============|==============
products      | product_name | SELECT         | amelia        | user
products      | product_name | SELECT         | analytics     | role

Row-level security

Policies that prefilter data

CREATE RLS POLICY policy_books
WITH (category VARCHAR(255))
USING (category = 'Dark Academia');

SELECT product_line, category, product_name
FROM products;

product_line | category      | product_name
=============|===============|===================
Books        | Dark Academia | A Deadly Education

Row-level security

SVV_RLS_POLICY to view policies

SELECT polname AS policy_name, 
       polatts AS column_details,
       polqual AS condition
  FROM SVV_RLS_POLICY;

policy_name  | column_details                                 | condition
 ============|================================================|===========================
policy_books | [{"colname":"category","type":"VARCHAR(255)"}] | category = 'Dark Academia'

Row-level security admin view

SVV_RLS_APPLIED_POLICY can be used by Superusers to see affected queries

SELECT username, 
       command, 
       relschema, 
       relname, 
       polname,
FROM SVV_RLS_APPLIED_POLICY;

username | command | relschema | relname  | polname  
=========|=========|===========|==========|=============
aashvi   |    s    | public    | products | policy_books

Dynamic Masking overview

Policy that obscures values returned by a query
Only a super user or someone granted can see them
Uses
- National ID numbers (e.g. Social Security Number)
- Credit cards

SELECT name, social_security_number
  FROM customers;

name     | social_security_number
======== | =======================
John Doe | XXX-XX-1234
Jane Doe | XXX-XX-5678

Let's practice!

Introduction to Redshift