Container Image Signing With Decentralized Manifest Validation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing container image signing solutions, such as Docker's Notary, suffer from a single point of failure and are difficult to manage at scale due to the need for centralized authentication, making it challenging to authenticate and secure container images effectively.
Innovation Solution
The image manifest is signed using a private-key cryptography, embedding a unique authentication signature within the manifest, allowing end-users to validate authenticity without a central server, and setting an expiry date for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized server and database are used to manage image signing (Docker Notary), then image authentication can be validated, but a single point of failure is created and scalability is reduced
Solution Approach 1:
The centralized authentication system is segmented into distributed key pairs. Each image producer has their own private key for signing, and each end-user system has its own public key for validation. This distributes the authentication function across multiple independent entities, eliminating the single point of failure while maintaining authentication capability.
Solution Approach 2:
The authentication signature is extracted from the centralized server and embedded directly within the image manifest. This allows validation to occur locally at the end-user system without requiring connection to the centralized server, removing the dependency on centralized infrastructure.
2Reliability
If a centralized server is used to manage image signing, then authentication can be performed, but management at scale becomes difficult
Solution Approach 1:
Each end-user system performs self-service authentication by validating signatures locally using stored public keys. No centralized server intervention is required during validation, allowing each system to independently authenticate images and manage their own authentication process at scale.
Solution Approach 2:
Public keys are pre-configured in end-user systems before authentication is needed. This preliminary setup allows rapid validation of multiple images without requiring real-time connection to a centralized server, facilitating scalable operations.
3Adaptability or versatility
If signatures are embedded in image manifests, then decentralized validation is enabled, but additional validation steps are required for expired signatures
Solution Approach 1:
Expiry dates are pre-set on signatures during the signing process. This preliminary action allows the validation system to automatically check expiration status without complex real-time validation logic, simplifying the overall process while enabling decentralized control.
Solution Approach 2:
The system provides feedback on signature validity including expiration status. When a signature is expired or invalid, the system returns a clear rejection signal, allowing the end-user system to take appropriate action. This feedback mechanism simplifies validation by providing explicit results rather than requiring complex decision logic.
Data Source
AI summary
There is disclosed a process for signing an image file as well as a process for validating the signed image file as well as a system for signing and validating these image files. The process for signing and authenticating or validating these image files comprises signing these image files with at least one private key, and then authenticating these image files with the corresponding public key. In addition, associated with the signing of these image files are custom claims or restrictions on use. Thus, along with the signing and authentication or validation of these image files, the types of use and duration of use of these image files can be controlled by the originator of the image file.