Orchestrating Least Privilege by Diogo Monica

Orchestrating Least Privilege

What is an Orchestrator?

What is an Orchestra?

Job of a Conductor

-Casting-Assign sheet music-Unify performers-Set the tempo

Job of an Orchestrator

-Node management-Task assignment-Cluster state reconciliation-Resource Management

What is a Least Privilege

Orchestrator?

What is Least Privilege?

A process must be able to access only the information and

resources that are necessary for its legitimate purpose. Principle of Least Privilege

Why Least Privilege?

What do we need to achieve Least

Privilege Orchestration?

Mitigating External Attacker

-Externally accessible service ports are explicitly defined

-Administration endpoints are authenticated and authorized

Mitigating Internal Network Attacker

-Authentication of both network and cluster control-plane communication

-Service to service communication is authorized, with orchestrator managed ACLs

Mitigating MiTM Attacker

-All control and data-plane traffic is encrypted.

Mitigating Malicious Worker

‣Should only have access to resources currently in use‣Push VS Pull‣No ability to modify or access any cluster state except their own.‣Identity is assigned, never requested

Mitigating Malicious Manager

‣Can’t run arbitrary code on workers‣No access to secret material‣No ability to spin up unauthorized nodes/impersonate existing nodes.‣No ability to read service-to-service communication

Byzantine Consensus.

Mutual TLS by default

• First node generates a new self-signed CA.



• New nodes can get a certificate issued w/ a token.




• Workers and managers identified by their certificate.




• Workers and managers identified by their certificate.

• Communications secured with Mutual TLS.

The Token

SWMTKN-1-mx8susrv1etsmc8omaom825bet6-cm6zts22rl4hly2

Prefix to allow VCSsearches for leaked

Tokens

Token Version

Cryptographic Hashof the CA Root Certificate

for bootstrap

Randomly generatedSecret

Bootstrap

1. Retrieve and validate Root CA Public key material.

2. Submit new CSR along with secret token.

3. Retrieve the signed certificate.

Automatic Certificate Rotation

1. Submit new CSR using old key-pair.

2. Retrieve the new signed certificate.

Support for External CAs

• Managers support BYO CA.

• Forwards CSRs to external CA.

Thank you

Orchestrating Least Privilege by Diogo Monica

Technology

Transcript of Orchestrating Least Privilege by Diogo Monica