Addressing Security Challenges in the Container and Cloud-Native Age

By Muhuan, Dahu, and Zhuanghuai

The China Academy of Information and Communications Technology believes that Alibaba Cloud Container Service takes the lead in the Chinese market and outperforms other competitors in the international market in the following areas: minimizing attack surfaces, verifying the signatures of binary images, and encrypting data by using the bring-your-own-key (BYOK) model.

Security Challenges of the Container and Cloud-Native Age

High Density and Dynamicity

Each traditional server runs a few applications. With the introduction of containerization, hundreds of applications now can run on a single server. In addition, the automatic recovery of containers may result in their migration between servers at a moment’s notice.

Fast and Agile Iteration

Containerized applications developed in the DevOps model are released several times more frequently than traditional applications.

More Risk Sources

In a time of open standards, and as the software industry makes increasing use of community-developed projects, the introduction of non-trusted, open-source third-party software leads to greater security risks. At the same time, containers by nature require a higher level of cloud-native security.

To deal with the unceasing difficulties brought by the preceding challenges, in 2018, the Alibaba Cloud Container Service team put forward the concept of end-to-end enterprise-grade security and developed a three-layer comprehensive, end-to-end cloud-native security architecture.

As shown in the preceding figure, the underlying layer of this architecture relies on the physical security, hardware security, virtualization security, and cloud product security capabilities provided by the Alibaba Cloud platform.

The middle layer of the architecture, container infrastructure security, is based on the idea of attack surface minimization. Many important security capabilities work at this layer, including access control, permission management, configuration hardening, and identity management. It also provides necessary elements for user access security, such as credential issuance, certificate and key management, and cluster audit. These elements together form an automated operations and maintenance (O&M) system.

At the top layer are runtime and supply-chain security capabilities that cover the lifecycle of containerized applications from building an application to running it. For example, image signing and security scanning are available in the building phase, and integrated security management capabilities are available in the deployment and runtime phases. These capabilities include runtime policy management, configuration inspection, and runtime security scanning. The architecture also supports sandboxed containers and a trusted execution environment (TEE). These features together provide enterprises with improved isolation and data security for containerized applications.

Ensuring the Security of Containerized Applications throughout Their Lifecycles

To address these new challenges, we have used the three-layer cloud security architecture described in the preceding section with Alibaba Cloud Container Service for Kubernetes and Container Registry to conduct the following successful trials:

  • In-depth protection to set up an integrated security process from the supply chain to the runtime
  • Minimized attack surface to build a secure and stable container infrastructure platform

With these benefits, we have built the overall security architecture for Alibaba Cloud container services and can guarantee the security of containerized applications throughout their lifecycles.

The overall security architecture for Alibaba Cloud container services provides the following benefits for user applications in different phases of their lifecycles:

Development, Testing, and Building Phases

  • Users can scan application images in the supply chain to detect security risks in advance.
  • With Alibaba Cloud Container Registry Enterprise Edition, enterprise users can enable image signing on specified repositories to automatically sign images to be deployed.

Pre-deployment

With the centralized policy management platform in Alibaba Cloud Container Service, a cluster security administrator can implement customized security governance for application systems in different clusters.

Post-deployment

The Container Service security management center allows users to protect the runtime security of container applications and provides in-depth protection for overall container security.

Extensive Practical Experience with Cloud-native Applications

Over the past decade, Alibaba Cloud has provided security solutions for Container Service customers in the following scenarios:

Security Protection for Corporate IT Assets

An international new-retail giant uses the image signing and scanning features of the Container Registry security software supply chain, resource access management (RAM) roles for RBAC, end-to-end mTLS authentication in Alibaba Cloud Service Mesh, and certificate management and auditing.

Data Operation Security

To implement fine-grained control of east-west application traffic, an international financial bank uses end-to-end data encryption in Container Service for Kubernetes and runtime alert monitoring in Security Center in conjunction with Alibaba Cloud Service Mesh.

Permission Management and Control

To protect sensitive data on containers from disclosure, an international game company uses permission-based isolation of control-plane cloud resources at the pod level, synchronously imports and updates keys from external key management systems, and implements data-plane permission control and key management.

The preceding scenarios are typical to our customers. With our experience dealing with the requirements of these scenarios, Alibaba Cloud has launched the most extensive cloud-native product family, made the most comprehensive open-source contributions to cloud-native computing, developed the largest container clusters, established the largest customer base, and acquired rich practical experience in deploying cloud-native applications.

Summary

The Alibaba Cloud Container Service team believes that these strengths awarded Alibaba Cloud with the certification for advanced trusted cloud security from the China Academy of Information and Communications Technology.

Source: Lingyun Moments (WeChat official account: linuxpk)

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