Kubernetes Pod TLS Authentication Using Injected Tokens and Certificates

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Solution Overview

Problem

In Kubernetes container orchestration environments, establishing a trusted and secured client-server model is challenging due to issues like Man-in-the-Middle attacks, automated pod lifecycles, and TLS certificate management automation, particularly in managing secrets and ensuring secure communication between pods.

Innovation Solution

Implementing a system where a Kubernetes API server injects service tokens and self-signed certificates into pods, using a shared PVC for secure TLS connections, and enabling token-based authentication with HA failover for seamless workload transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If self-signed TLS certificates are generated and stored in shared memory for secure pod communication, then security against MITM attacks is improved, but device complexity increases due to certificate management overhead

Engineering Contradiction:

ImprovesecurityVSAvoidcertificate management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Server pods automatically generate their own self-signed TLS certificates without external intervention. The certificate generation is embedded in the pod startup process, allowing each pod to independently establish its cryptographic identity and store certificates in shared memory, eliminating the need for centralized certificate authority management.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

TLS certificates are generated and stored in shared memory before the pod begins processing requests. This preliminary setup ensures that secure communication channels are already established when the pod becomes active, avoiding security configuration issues during runtime.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If service tokens are injected into client pods for authentication, then access control is improved, but ease of operation deteriorates due to automated lifecycle management requirements

Engineering Contradiction:

Improveaccess controlVSAvoidpod lifecycle management

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system continuously monitors pod lifecycle events and automatically manages service token injection and revocation. When pods are created, updated, or terminated, the feedback mechanism triggers corresponding authentication credential management actions, ensuring access control remains synchronized with pod states without manual intervention.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Client pods automatically receive and manage their service tokens through injected mechanisms. The authentication credentials are self-managed within the pod lifecycle, with automatic renewal and revocation based on pod state changes, reducing operational overhead while maintaining security.

Inventive Principle:

Principle #25Self-service

3Reliability

If automated TLS certificate rotation is implemented, then security maintenance is improved, but loss of time increases due to automation overhead

Engineering Contradiction:

Improvecertificate maintenanceVSAvoidautomation overhead

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

TLS certificates are automatically rotated at predetermined intervals based on their expiration dates. The system periodically checks certificate validity and performs rotation before expiration, ensuring continuous security without manual intervention. This periodic automation balances maintenance reliability with time efficiency by acting only when necessary.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Certificate rotation is performed preliminarily before expiration dates are reached. The system proactively generates and deploys new certificates in advance, allowing for seamless transitions without service disruption, thus reducing the time impact of certificate maintenance.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If multiple server pods with HA failover are configured, then system availability is improved, but device complexity increases due to failover management

Engineering Contradiction:

ImproveavailabilityVSAvoidfailover management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple server pods are configured with identical self-signed certificate generation capabilities and authentication mechanisms. Each pod independently performs the same functions of certificate management and secure communication, eliminating the need for specialized failover configuration while maintaining high availability through redundant, functionally equivalent instances.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12621287B2Trusted and secured client-server model in Kubernetes cluster pods

Publication Date: 2026.05.05 OPEN TEXT CORPORATION

AI summary

Systems and methods are provided for enabling a trusted and secured client-server model in a container orchestration environment. Various embodiments provide a trusted and secured client-server model leverages the concept of self-signed TLS certificates to automate and efficiently manage TLS connections. In some embodiments a Kubernetes API server injects a service token into each pod in a cluster. The Kubernetes API server also injects the certificate used to generate the service token. In a client server model between pods, clients can use the same service token as its identity to the server and the server can use the same certificate for validating the token. In this way, trust is established using token-based authentication between clients and servers.