End-to-End Security and Auditing in a Big Data as a Service Deployment
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End-to-End Security and Auditing in a Big Data as a Service Deployment
- 1. End-to-End Security and Auditing in a Big-Data-as-a-Service (BDaaS) Deployment Nanda Vijaydev - BlueData Abhiraj Butala - BlueData
- 2. “A mechanism for the delivery of statistical analysis tools and information that helps organizations understand and use insights gained from large information sets in order to gain a competitive advantage.” On-Demand, Self-Service, Elastic Big Data Infrastructure, Applications, Analytics Source: www.semantikoz.com/blog/big-data-as-a-service-definition-classification Big-Data-as-a-Service (BDaaS)
- 3. Multi-Tenant Big-Data-as-a-Service Data/Storage Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance Data LakeStaging Multiple compute services (Hadoop, BI, Spark) There is a shared Data Lake (Shared HDFS)
- 4. Why BDaaS? – Compute Side Of The Story • Set of applications that interact with Hadoop keeps growing • Various versions of the same app/distro run in parallel • Enterprises have need to scale compute up and down based on usage • A model similar to Amazon AWS with S3 as storage and applications on EC2
- 5. Why BDaaS? – Data Side Of The Story • Production cluster access takes time and is generally restricted • Staging clusters may not have all the data • Data exists on other storage systems such as NFS Isilon is common • Users also want to upload arbitrary files for analysis
- 6. Hadoop – A Collection Of Services Hadoop is a collection of storage and compute services such as HDFS, HBase, Hive, Yarn, Solr, Kafka
- 7. Security In Hadoop • Authenticate user into Hadoop ecosystem – Each service has its own integration with LDAP/AD for authentication • Authorize and limit their actions to selected services. Authorization is granted separately for each service. Example: – Folder “/user/customer” in HDFS has ‘r-x’ to user ‘alice’, and ‘- wx’ to user ‘bob’ – Enable column level access to a Hive Table. “Customer.Name” & “Customer.PhoneNumber” is only accessible by some users and groups
- 8. Ranger – A Pluggable Security Framework • Ranger works with a common user DB (LDAP/AD) for authentication • Provides a plug-in for individual Hadoop services to enable authorization • Allows users to define policies in a central location, using WEB UI or APIs • Users can define their own plug-in for a custom service and manage them centrally via Ranger Admin
- 9. Defining HDFS Ranger Policies HDFS Policy List Marketing Policy Drill Down
- 10. Security Considerations in BDaaS Data/Storage Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance Data LakeStaging 1. User Identity – Data Lake 2. User Identity - Application Level 3. User Identity propagation to Data Layer 1. User identity within a Data Lake 2. User identity in application layer 3. Prevent data duplication & maintain user integrity across layers
- 11. 1. Securing The Data Lake LDAPKDC Data/Storage Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance Data LakeStaging 1. Authentication & Authorization – Data Lake 2. User Identity - Application Level 3. User Identity propagation to Data Layer
- 12. 2. Securing The App Layer LDAP KDC Data/Storage Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance Data LakeStaging 1. Authentication & Authorization – Data Lake 2. User Identity - Application Level 3. User Identity propagation to Data Layer App containers are integrated with LDAP KDC AliceBob Tom
- 13. 3. Identity Propagation to Data Layer LDAP KDC Data/Storage Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance Data LakeStaging 1. Authentication & Authorization – Data Lake 2. User Identity - Application Level 3. User Identity propagation to Data Layer KDC AliceBob Tom
- 14. User Identity Propagation Two Ways –Users connect directly to HDFS • Simple Authentication • Kerberos Authentication –Users connect to HDFS via a Super-user (Impersonation)
- 15. HDFS Direct Connections LDAP KDC Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance KDC Alice BobTom HDFS Data Lake
- 16. HDFS Direct Connections.. – hdfs-audit.log – Ranger policies are enforced for alice and bob as they are the effective users
- 17. HDFS Direct Connections.. • Single Hadoop Setup – Ideal • Multi-tenant, Multi-application Setup – Kerberized HDFS needs kerberized compute and services – May not want to kerberize Dev/QA setups – Hadoop versions should be compatible all across – Data duplication
- 18. HDFS Super-user Connections • Super-users perform actions on behalf of other users (Impersonation/Proxying) • Adding a new super-user is easy – core-site.xml
- 19. HDFS Super-user Connections.. LDAP KDC Prod 2.2 Dev/Test 2.4 POC 2.3 Prod 2.3 Dev/Test 2.4 MARKETING R&D MANUFACTURING 360 Customer View Log Analysis Predictive Maintenance KDC Alice BobTom HDFS Data Lake DataTap Caching Service via – super-user
- 20. HDFS Super-user Connections.. – hdfs-audit.log – Ranger Authorization policies still enforced, as alice and bob are effective users
- 21. HDFS Super-user Connections.. Multi-tenant, Multi-application Setup – Works for applications which don’t support Kerberos (yet) – Dev/Test setups need not be kerberized – DataTap service can abstract version incompatibilities – Can help avoid data duplication – Need tight LDAP/AD integration though!
- 22. Ranger in Action Hue Example
- 23. HDFS Permissions on Data Lake • Set HDFS file access for ‘/user/secret’ to strict mode • Set umask to ‘077’
- 26. Create Table via Hue
- 27. Query table via Hue - Success
- 28. Query table via Hue - Failure
- 30. Key Takeaways • BDaaS is more than Hadoop-as-a-Service – Includes BI / ETL / Analytics + Data Science tools • Security is an important consideration in BDaaS • Data duplication is not an option • Global user authentication using a centralized DB like LDAP/AD is a must • Apache Ranger helps in enforcing global policies, provided user identities are propagated correctly
- 31. Q & A www.bluedata.com Nanda Vijaydev @nandavijaydev Abhiraj Butala @abhirajbutala
Notas del editor
- Tom There are many definitions of BDaaS. Some say it is the combo of s/w & data- that can be hard to grasp. We say it is functionality stack:
- This is how the audit logs for direct connections will look like. Bob and alice will have entry as highlighted above. Ranger Authorization policies are enforced.
- Finally, to summarize the use of direct HDFS connections. Works best in a Single Hadoop Setup. Single Hadoop distro, kerberos everywhere, tight coupling. May not want to kerberize Dev/QA setups. May not be practical.
- Standard feature supported by Hadoop eco-system components to access HDFS data A super user performs operations on behalf of other users. Also known as impersonation. Typical configuration.
- This is how the audit logs for connections via super-users will look like. Bob and alice will have entries as highlighted above. Please note that, Ranger policies are still enforced for Bob and Alice, as they are the effective users!
- Finally, lets see what are the pros and cons of using supers-users.
- Finally, lets demonstrate all this by taking an example of Hue. Here, Hue is running in one of the compute nodes in a multi-tenant environment. It is trying to access data from HDFS, for which Ranger policies are enforced. Also, note that, Hue is LDAP integrated.
- Here, HDFS path /user/secret has restricted access Also, HDFS umask is set to 077, so it only allows the owner to access the data.
- This is how Ranger policies are defined for HDFS. We are defining who can access /user/secret path. Describe users nanda, abhiraj
- In our product, the HDFS caching service (DataTap), also supports impersonation. We won’t go into its details for the purpose of this talk. Typically, it is used to load remote HDFS backends as DataTaps, as shown in this picture.
- Using Hive Editor in Hue, we create a table using the path provided. Explain dtap:// path. User here is nanda, who was read/write permissions. This will succeed as Ranger policies will allow it.
- Now, the same user nanda queries the table and it succeeds. Note that, even though the permissions are 000, Ranger allows access to nanda. So it goes through.
- Next, the same operation is performed by user abhiraj. Here, it fails, because Ranger does not allow abhiraj to read. Thus, ranger policies are enforced.
- Finally, this is how the audit logs would look like. As you can see, nanda is allowed read access. Abhiraj is denied access. So, this shows that even though we use impersonation from remote clusters, the policies are still enforced. This is because, effective users are still ‘nanda’ and ‘abhiraj’.