Container Image Signing for Digest-Based Integrity Verification
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Solution Overview
Problem
Ensuring the integrity and security of container images is a critical issue in cloud computing, as image security directly affects the security of containers and underlying infrastructure, with existing methods lacking effective mechanisms for image management and authentication.
Innovation Solution
An image management method and apparatus that involves receiving signer and image information, generating a signature file based on the signer's identity and image content, and verifying the digest of the image to ensure its integrity before allowing container startup, thereby enhancing security and reducing operational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional image management method is used, then the image can be pushed and pulled freely, but the integrity and security of the image cannot be ensured
Solution Approach 1:
The patent applies preliminary action by requiring the image to be signed before it is pushed to the registry. The signer generates a signature file containing a digest of the image content, and this signature is attached to the image metadata before the image is made available for pulling. This ensures that the image integrity is verified in advance, preventing tampered images from being deployed while maintaining a streamlined management process.
2Ease of manufacture
If the signer generates key pairs and stores keys locally, then the image can be signed, but the operation complexity and security risks increase
Solution Approach 1:
The patent introduces an intermediary mechanism where the signing process is mediated through a coordinated system involving the terminal device, registry server, and image management apparatus. Instead of requiring the signer to independently generate and store private keys, the system uses a key pair generation mechanism where the public key is stored in the registry and the private key is used for signing. This intermediary approach simplifies the signer's operation while distributing security responsibilities across the system architecture.
3Reliability
If the container platform verifies image digests manually, then the security can be verified, but the productivity and automation are reduced
Solution Approach 1:
The patent implements feedback mechanisms at multiple stages: the registry server returns the signature file along with image pull requests, the image management apparatus verifies the signature and returns verification results, and the container platform uses this feedback to determine whether to allow container startup. This automated feedback loop ensures security verification is performed accurately while maintaining high productivity by eliminating manual verification steps and enabling automated security checks throughout the image lifecycle.
Data Source
AI summary
An image management method includes: receiving information about a signer and information about a target image that are sent by a first terminal device, where the signer is an object designated to sign the target image; obtaining a signature file based on the information about the signer and the information about the target image; and if a first digest that is of the target image and is returned by a container platform matches a second digest obtained based on the signature file, indicating the container platform to allow use of the target image to start a container.