Cloudera Engineering Blog · Security Posts
Apache Hive was one of the first projects to bring higher-level languages to Apache Hadoop. Specifically, Hive enables the legions of trained SQL users to use industry-standard SQL to process their Hadoop data.
However, as you probably have gathered from all the recent community activity in the SQL-over-Hadoop area, Hive has a few limitations for users in the enterprise space. Until recently, two in particular – concurrency and security – were largely unaddressed.
Thanks to Steven Noels, SVP of Products for NGDATA, for the guest post below.
NGDATA builds and sells Lily, the next-generation Customer Intelligence Platform that helps enterprise marketing teams collect and store customer interaction data in order to profile, segment, and present better offers. We designed Lily from the ground up to run on Apache HBase and Apache Solr. Combining these technologies with our deep marketing segmentation expertise and unique machine learning techniques we’re able to deliver interactive data management, real-time statistical calculations, faceted search views of customers, offers, interactions and the permutations they each inspire.
The following guest post comes from Alejandro Caceres, president and CTO of Hyperion Gray LLC – a small research and development shop focusing on open-source software for cyber security.
Imagine this: You’re an informed citizen, active in local politics, and you decide you want to support your favorite local political candidate. You go to his or her new website and make a donation, providing your bank account information, name, address, and telephone number. Later, you find out that the website was hacked and your bank account and personal information stolen. You’re angry that your information wasn’t better protected — but at whom should your anger be directed?
Hadoop network encryption is a feature introduced in Apache Hadoop 2.0.2-alpha and in CDH4.1.
In this blog post, we’ll first cover Hadoop’s pre-existing security capabilities. Then, we’ll explain why network encryption may be required. We’ll also provide some details on how it has been implemented. At the end of this blog post, you’ll get step-by-step instructions to help you set up a Hadoop cluster with network encryption.
A Bit of History on Hadoop Security
With the default Apache HBase configuration, everyone is allowed to read from and write to all tables available in the system. For many enterprise setups, this kind of policy is unacceptable.
Administrators can set up firewalls that decide which machines are allowed to communicate with HBase. However, machines that can pass the firewall are still allowed to read from and write to all tables. This kind of mechanism is effective but insufficient because HBase still cannot differentiate between multiple users that use the same client machines, and there is still no granularity with regard to HBase table, column family, or column qualifier access.
One of the more confusing topics in Hadoop is how authorization and authentication work in the system. The first and most important thing to recognize is the subtle, yet extremely important, differentiation between authorization and authentication, so let’s define these terms first:
Authentication is the process of determining whether someone is who they claim to be.
What is Kerberos & SPNEGO?
Kerberos is an authentication protocol that provides mutual authentication and single sign-on capabilities.
Post written by Cloudera Software Engineer Aaron T. Myers.
Apache Hadoop has had methods of doing user authorization for some time. The Hadoop Distributed File System (HDFS) has a permissions model similar to Unix to control file and directory access, and MapReduce has access control lists (ACLs) per job queue to control which users may submit jobs. These authorization schemes allow Hadoop users and administrators to specify exactly who may access Hadoop’s resources. However, until recently, these mechanisms relied on a fundamentally insecure method of identifying the user who is interacting with Hadoop. That is, Hadoop had no way of performing reliable authentication. This limitation meant that any authorization system built on top of Hadoop, while helpful to prevent accidental unwanted access, could do nothing to prevent malicious users from accessing other users’ data.
Today’s Hadoop World talk comes from Owen O’Malley and talks about some of the biggest challenges facing Hadoop: Security and API Compatibility.
Over the past several months, Yahoo! has been leading the charge in both areas. This work will enable wider use of Hadoop within Yahoo! as well as lower the barrier for new users – particularly those working with sensitive data. A big thanks to Yahoo! and everyone else in the community helping out.