Secured (Kerberos-based) Spark Notebook for Data Science: Spark Summit East talk by Joy Chakraborty
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The document discusses securing Spark notebooks for data science by integrating Kerberos authentication. It begins with an overview of Spark notebooks and the current authentication approach. It then covers the requirements for Kerberos integration, how Kerberos works in HDFS and Yarn clusters, and a proposed design to integrate Kerberos into JupyterHub, SparkMagic and Livy to authenticate users and allow secured access to HDFS and Spark from notebooks. Key aspects of the design include custom JupyterHub authenticators and spawners, obtaining service tickets from the KDC, and propagating user identities through the system.
![© 2017 Bloomberg Finance L.P. All rights reserved. 36
Jupyter + Spark with Kerberos
Client
KDC
Spawner
SparkMagic
JupyterHub
KDC
Authenticator
Web
Service
Livy
2
1
3
4
5
6
7
8
0. LIVY HTTP
Service
Principles/Keys
2. KDC sends TGT
1. Client requests Ticket (kinit)
5. Client sends TGT and asks for JHUB Service Ticket
6. KDC sends Service Ticket
8. Spawns user session
4. 401/www-Authenticate: Negotiate
7. Sends HTTP GET with Get- Authorization: Negotiate
<jhub service-ticket>
3. Jhub sends URL request (GET)
0. Service
Principles/Keys
???
???
1. Opens Notebook
session
2. Encrypts user-id and
puts it into
env['PROXY_USER']
Connection/session established](https://image.slidesharecdn.com/9ajoychakraborty-170214184113/85/Secured-Kerberos-based-Spark-Notebook-for-Data-Science-Spark-Summit-East-talk-by-Joy-Chakraborty-36-320.jpg)
![© 2017 Bloomberg Finance L.P. All rights reserved. 39
Jupyter + Spark with Kerberos
Client
KDC
Spawner
SparkMagic
JupyterHub
KDC
Authenticator
Web
Service
Livy
2
1
3
4
5
6
7
8
9
10
0. LIVY HTTP
Service
Principles/Keys
2. KDC sends TGT
1. Client requests Ticket (kinit)
5. Client sends TGT and asks for JHUB Service Ticket
6. KDC sends Service Ticket
8. Spawns user session
4. 401/www-Authenticate: Negotiate
7. Sends HTTP GET with Get- Authorization: Negotiate
<jhub service-ticket>
9. Uses SM keytab to asks for LIVY service ticket (kinit)
3. Jhub sends URL request (GET)
10. KDC sends Livy Service Ticket
11
11. Forwards the request to SparkMagic kernel
0. Service
Principles/Keys
???
???
1. SparkMagic reads the
encrypted
env['PROXY_USER'] and adds
it to the Http request body as
“proxyUser”.
Connection/session established](https://image.slidesharecdn.com/9ajoychakraborty-170214184113/85/Secured-Kerberos-based-Spark-Notebook-for-Data-Science-Spark-Summit-East-talk-by-Joy-Chakraborty-39-320.jpg)
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Secured (Kerberos-based) Spark Notebook for Data Science: Spark Summit East talk by Joy Chakraborty
- 1. © 2017 Bloomberg Finance L.P. All rights reserved. February 8, 2017 Joy Chakraborty Distributed System Architect Secured (Kerberos-based) Spark Notebook for Data Science Spark Summit East 2017
- 2. © 2017 Bloomberg Finance L.P. All rights reserved. Speaker Bio I am a Distributed System Architect with 17+ years of application software development experience and 10+ years of experience in designing, architecting and developing Distributed systems. I have a special interest in distributed and parallel computing, and currently work on Cloud and Big Data technologies. I also actively participate in various Software architectural organizations. I have been working in Bloomberg’s Data Platform team as a Data Engineer since 2014. My responsibility is to store and process petabytes of data reliably, predictably and securely.
- 3. © 2017 Bloomberg Finance L.P. All rights reserved. 3 Agenda Why Secured Data Science Notebook?1 Design and technologies consideration2 Integration and Implementation3 Question/Answers4
- 4. © 2017 Bloomberg Finance L.P. All rights reserved. • Create Distributed Data platform to : –Ingest various data sources across the organization –Store data at most granular level in consistent format –Provide tooling across organization to perform Data-exploration, Analysis & Machine learning activities 4 Why Data Science Notebook?
- 5. © 2017 Bloomberg Finance L.P. All rights reserved. 5 Data exploration, Analysis and Machine Learning Other Sources Databases Files Data Data Data Data Cluster
- 6. © 2017 Bloomberg Finance L.P. All rights reserved. 6 Data exploration, Analysis and Machine Learning Other Source s Databases Files Data Data Data Data Cluster
- 7. © 2017 Bloomberg Finance L.P. All rights reserved. 7 What are organization requirements for tooling?
- 8. © 2017 Bloomberg Finance L.P. All rights reserved. • Spark Notebook for Web-based Scala/Python libraries Templates Security and login integration Data discovery Enhanced SQL support 8 Jupyter Notebook for Spark
- 9. © 2017 Bloomberg Finance L.P. All rights reserved. • JupyterHub (Notebook web-application for multi-users environment) • SparkMagic (Spark kernel for Jupyter Notebook supporting Python & Scala) • Livy (HTTP REST web-service for to submit Spark jobs, managing sessions, etc.) • HDFS/Yarn (HDFS and Yarn running Spark jobs) 9 Spark Notebooks – Tech Stack
- 10. © 2017 Bloomberg Finance L.P. All rights reserved. 10 JupyterHub – Current State
- 11. © 2017 Bloomberg Finance L.P. All rights reserved. 11 JupyterHub Web Service Yarn Cluster Livy JupyterHub – Current State SparkMagic Spark-Scala Spark-Python Spark Job 1. JupyterHub login using OAuth 2. Sends HTTP Request 3. Creates/maintains Spark session and submits the Spark job to the yarn cluster xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy xxxxxxxx yyyyyyyy Running multiple Notebooks 4. Spark job output 5. HTTP Response
- 12. © 2017 Bloomberg Finance L.P. All rights reserved. 12 Requirement – Kerberos Integration • Kerberos is a Network Authentication Protocol that works on the basis of 'tickets' to allow nodes communicating over a network to prove their identity to one another in a secure manner. Kerberos uses account databases such as domain’s Active Directory.
- 13. © 2017 Bloomberg Finance L.P. All rights reserved. 13 Current State (with Kerberos) • HDFS supports Kerberos • Livy Supports Kerberos (configurable in Livy) • Can impersonate a user using HDFS “proxyuser” setting and submit Spark job on behalf of a user • A superuser with username ‘super’ wants to submit job and access hdfs on behalf of a user1. The superuser has kerberos credentials but user user1 doesn’t have any. The tasks are required to run as user user1. It is required that user1 can connect to the namenode or job tracker on a connection authenticated with super’s kerberos credentials. • JupyterHub and SparkMagic: No support for Kerberos <property> <name>hadoop.proxyuser. livyusr.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.livyusr.groups</name> <value>LIVY_GRP</value> </property>
- 14. © 2017 Bloomberg Finance L.P. All rights reserved. 14 How Kerberos works in HDFS and Yarn cluster running Spark Jobs?
- 15. © 2017 Bloomberg Finance L.P. All rights reserved. 15 HDFS/Spark with Kerberos Client
- 16. © 2017 Bloomberg Finance L.P. All rights reserved. 16 HDFS/Spark with Kerberos Client 0. Service Principles/Keys
- 17. © 2017 Bloomberg Finance L.P. All rights reserved. 17 HDFS/Spark with Kerberos Client 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys
- 18. © 2017 Bloomberg Finance L.P. All rights reserved. 18 HDFS/Spark with Kerberos Client 1. Client Request Ticket 2. KDC sends TGT 0. Service Principles/Keys
- 19. © 2017 Bloomberg Finance L.P. All rights reserved. 19 HDFS/Spark with Kerberos Client 5. Sends Service Ticket and requests for Authentication 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys
- 20. © 2017 Bloomberg Finance L.P. All rights reserved. 20 HDFS/Spark with Kerberos Client Retrieves User roles/permissions 6. User Authenticated using Service Principle/key 5. Sends Service Ticket and requests for Authentication 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys
- 21. © 2017 Bloomberg Finance L.P. All rights reserved. 21 HDFS/Spark with Kerberos Client Retrieves User roles/permissions 6. User Authenticated using Service Principle/key 5. Sends Service Ticket and requests for Authentication Client/Server session established 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys
- 22. © 2017 Bloomberg Finance L.P. All rights reserved. 22 Let’s have JupyterHub as Client and bring SparkMagic and Livy
- 23. © 2017 Bloomberg Finance L.P. All rights reserved. 23 Jupyter + Spark with Kerberos Client Retrieves User roles/permissions 6. User Authenticated using Service Principle/key 5. Sends Service Ticket and requests for Authentication Client/Server session established 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys
- 24. © 2017 Bloomberg Finance L.P. All rights reserved. 24 Jupyter + Spark with Kerberos Client 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys The nature of communication between Browser client and HDFS will be different
- 25. © 2017 Bloomberg Finance L.P. All rights reserved. 25 Jupyter + Spark with Kerberos Client 1. Client requests Ticket 2. KDC sends TGT 0. Service Principles/Keys Also the TGT process between Browser client and KDC will change.
- 26. © 2017 Bloomberg Finance L.P. All rights reserved. 26 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 0. Service Principles/Keys 1. Client requests Ticket 2. KDC sends TGT 1. KDCAuthenticator: JupyterHub Authentication extensibility point 2. KDCSpawner: JupyterHub per user session extensibility point
- 27. © 2017 Bloomberg Finance L.P. All rights reserved. 27 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 0. Service Principles/Keys 1. Client requests Ticket 2. KDC sends TGT ??? ??? ???
- 28. © 2017 Bloomberg Finance L.P. All rights reserved. 28 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 0. LIVY HTTP Service Principles/Keys 0. Service Principles/Keys ??? ??? ??? 1. Client requests Ticket 2. KDC sends TGT
- 29. © 2017 Bloomberg Finance L.P. All rights reserved. 29 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 0. Service Principles/Keys ??? ??? ???
- 30. © 2017 Bloomberg Finance L.P. All rights reserved. 30 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 0. LIVY HTTP Service Principles/Keys Retrieves User roles/permissions 2. KDC Sends TGT 1. Client requests Ticket (kinit) 4. 401/www-Authenticate: Negotiate 3. Jhub sends URL request (GET) 0. Service Principles/Keys ??? ??? Spnego
- 31. © 2017 Bloomberg Finance L.P. All rights reserved. 31 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 4. 401/www-Authenticate: Negotiate 3. Jhub sends URL request (GET) 0. Service Principles/Keys ??? ???
- 32. © 2017 Bloomberg Finance L.P. All rights reserved. 32 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 3. Jhub sends URL request (GET) 0. Service Principles/Keys ??? ???
- 33. © 2017 Bloomberg Finance L.P. All rights reserved. 33 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 3. Jhub sends URL request (GET) 0. Service Principles/Keys ??? ??? 1. Supports SPNEGO 2. Authenticates user using HTTP service principle/key 3. Retrieves user-id
- 34. © 2017 Bloomberg Finance L.P. All rights reserved. 34 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 3. Jhub sends URL request (GET) 0. Service Principles/Keys ??? ??? Connection/session established
- 35. © 2017 Bloomberg Finance L.P. All rights reserved. 35 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Send HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 3. Jhub sends URL request (GET) ??? ??? 0. Service Principles/Keys Connection/session established
- 36. © 2017 Bloomberg Finance L.P. All rights reserved. 36 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 3. Jhub sends URL request (GET) 0. Service Principles/Keys ??? ??? 1. Opens Notebook session 2. Encrypts user-id and puts it into env['PROXY_USER'] Connection/session established
- 37. © 2017 Bloomberg Finance L.P. All rights reserved. 37 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 0. Service Principles/Keys ??? ??? Connection/session established
- 38. © 2017 Bloomberg Finance L.P. All rights reserved. 38 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 11. Forwards the request to SparkMagic kernel 0. Service Principles/Keys ??? ??? Connection/session established
- 39. © 2017 Bloomberg Finance L.P. All rights reserved. 39 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 11. Forwards the request to SparkMagic kernel 0. Service Principles/Keys ??? ??? 1. SparkMagic reads the encrypted env['PROXY_USER'] and adds it to the Http request body as “proxyUser”. Connection/session established
- 40. © 2017 Bloomberg Finance L.P. All rights reserved. 40 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 12 11. Forwards the request to SparkMagic kernel 12. Submits the Spark request over HTTP to Livy with Get- Authorization: Negotiate <Livy service-ticket> 0. Service Principles/Keys ??? Connection/session established
- 41. © 2017 Bloomberg Finance L.P. All rights reserved. 41 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 12 13 14 11. Forwards the request to SparkMagic kernel 12. Submits the Spark request over HTTP to Livy with Get- Authorization: Negotiate <Livy service-ticket> 13. Uses Livy keytab to asks for HDFS service ticket 14. KDC sends HDFS Service Ticket 0. Service Principles/Keys ??? Connection/session established
- 42. © 2017 Bloomberg Finance L.P. All rights reserved. 42 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 12 13 14 11. Forwards the request to SparkMagic kernel 12. Submits the Spark request over HTTP to Livy with Get- Authorization: Negotiate <Livy service-ticket> 13. Uses Livy keytab to asks for HDFS service ticket 14. KDC sends HDFS Service Ticket 0. Service Principles/Keys ??? 1. Livy decrypts the “proxyUser” and sets the “proxy-user” value for remote Spark-SubmitConnection/session established
- 43. © 2017 Bloomberg Finance L.P. All rights reserved. 43 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and asks for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 12 13 14 11. Forwards the request to SparkMagic kernel 12. Submits the Spark request over HTTP to Livy with Get- Authorization: Negotiate <Livy service-ticket> 13. Uses Livy keytab to asks for HDFS service ticket 14. KDC sends HDFS Service Ticket15 15. Livy submits remote Spark job using HTTP Spnego with Get- Authorization: Negotiate <HDFS service- ticket> 0. Service Principles/Keys Connection/session established
- 44. © 2017 Bloomberg Finance L.P. All rights reserved. 44 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and ask for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 12 13 14 11. Forwards the request to SparkMagic kernel 12. Submits the Spark request over HTTP to Livy with Get- Authorization: Negotiate <Livy service-ticket> 13. Uses Livy keytab to asks for HDFS service ticket 14. KDC sends HDFS Service Ticket15 15. Livy submits remote Spark job using HTTP Spnego with Get- Authorization: Negotiate <HDFS service- ticket> 0. Service Principles/Keys Retrieves User roles/permissions 16. User Authenticated using Service Principle/key 16 Connection/session established
- 45. © 2017 Bloomberg Finance L.P. All rights reserved. 45 Jupyter + Spark with Kerberos Client KDC Spawner SparkMagic JupyterHub KDC Authenticator Web Service Livy 2 1 3 4 5 6 7 8 9 10 0. LIVY HTTP Service Principles/Keys 2. KDC sends TGT 1. Client requests Ticket (kinit) 5. Client sends TGT and ask for JHUB Service Ticket 6. KDC sends Service Ticket 8. Spawns user session 4. 401/www-Authenticate: Negotiate 7. Sends HTTP GET with Get- Authorization: Negotiate <jhub service-ticket> 9. Uses SM keytab to asks for LIVY service ticket (kinit) 3. Jhub sends URL request (GET) 10. KDC sends Livy Service Ticket 11 12 13 14 11. Forwards the request to SparkMagic kernel 12. Submits the Spark request over HTTP to Livy with Get- Authorization: Negotiate <Livy service-ticket> 13. Uses Livy keytab to asks for HDFS service ticket 14. KDC sends HDFS Service Ticket15 15. Livy submits remote Spark job using HTTP Spnego with Get- Authorization: Negotiate <HDFS service- ticket> 0. Service Principles/Keys Retrieves User roles/permissions 16. User Authenticated using Service Principle/key 16 Connection/session established Connection/session established
- 46. © 2017 Bloomberg Finance L.P. All rights reserved. 46 Jhub-Kerberos Development Summary • JupyterHub • KDC Authenticator (configurable using JupyerHub configuration) • Supports Kerberos-Spnego authentication using HTTP Service Principle and keys • KDC Spawner (configurable using JupyerHub configuration) • Encrypts the current user-name and stores it in the “PROXY_USER” environment variable (before spawning a new user child process) which SparkMagic reads/uses later. • Kinit to get the Livy Service ticket for Spnego Authentication with Livy server. • SparkMagic • Adds current user-name (reading from “PROXY_USER” environment variable) as “proxyUser” in the Livy HTTP Request body. This behavior can enabled or disabled (default) by SparkMagic configuration • Livy changes (configurable using Livy configuration) • Supports to decrypt the “proxyUser” from the request body & adds to the remote Spark job request for HDFS impersonation
- 47. © 2017 Bloomberg Finance L.P. All rights reserved. 47 Jhub-Kerberos Development Setup • Learnings • KDC Domain controller running the AS and TGS • Multiple nodes running JupyterHub, Livy and Yarn (Spark) at different DNS farm and networking between these farms • Creating/modifying key-tabs and principles on demand basis in a corporate environment for dev • Corporate IT dependency • How Docker helps • Easy to bootstrap the JupyterHub, Livy, Yarn and KDC using Docker script • Seamless networking (easy to configure) between Docker instances • Creating Service principles and key-tabs on demand (without involving corporate IT) • Custom DNS farm setup for POC and development activities
- 48. © 2017 Bloomberg Finance L.P. All rights reserved. Q&A
- 49. © 2017 Bloomberg Finance L.P. All rights reserved. THANK YOU Joy Chakraborty Bloomberg L.P. [email protected]