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sec-design.md

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Okay, let's create a design document for the Egg.js framework based on the provided GitHub repository.

BUSINESS POSTURE

Egg.js is a Node.js framework designed to help developers build enterprise-level web applications and APIs. It emphasizes convention over configuration, extensibility, and stability. The business priorities appear to be:

  • Provide a stable and reliable framework for building enterprise applications.
  • Reduce development time and effort through conventions and built-in features.
  • Enable easy extension and customization to meet specific project needs.
  • Foster a strong community and ecosystem around the framework.
  • Maintain backward compatibility and minimize breaking changes.

Business Goals:

  • Become a leading choice for Node.js enterprise development.
  • Attract and retain a large and active user base.
  • Maintain a high level of developer satisfaction.
  • Ensure the long-term sustainability of the project.

Most Important Business Risks:

  • Security vulnerabilities in the framework or its dependencies could expose user data or disrupt applications.
  • Lack of adoption or a decline in community engagement could lead to the framework becoming obsolete.
  • Performance bottlenecks or scalability issues could limit the use of the framework for high-traffic applications.
  • Failure to keep up with the evolving Node.js ecosystem could make the framework less attractive to developers.
  • Inadequate documentation or support could hinder developer adoption and satisfaction.

SECURITY POSTURE

Existing Security Controls:

  • security control: Egg.js has a dedicated security plugin (egg-security) that provides protection against common web vulnerabilities like XSS, CSRF, clickjacking, and others. (Described in the documentation and implemented as a plugin).
  • security control: The framework encourages the use of secure coding practices through its conventions and documentation. (Described in documentation).
  • security control: Dependency management is handled through npm, allowing for regular updates to address known vulnerabilities in third-party libraries. (Implicit in the Node.js ecosystem).
  • security control: The framework provides built-in support for common security features like HTTPS and secure cookies. (Described in the documentation).
  • security control: Regular security audits and penetration testing are likely conducted, although this is not explicitly stated in the repository. (Assumption based on best practices).

Accepted Risks:

  • accepted risk: The framework relies on the security of its underlying dependencies, and vulnerabilities in those dependencies could impact the security of applications built with Egg.js.
  • accepted risk: Developers are ultimately responsible for implementing secure coding practices within their applications, and the framework cannot guarantee the absence of all vulnerabilities.
  • accepted risk: The framework's security plugin may not cover all possible attack vectors, and developers may need to implement additional security measures.

Recommended Security Controls:

  • Implement a robust Content Security Policy (CSP) to mitigate the impact of XSS attacks.
  • Integrate static application security testing (SAST) tools into the development workflow to identify potential vulnerabilities early on.
  • Implement dynamic application security testing (DAST) to scan running applications for vulnerabilities.
  • Establish a clear vulnerability disclosure program to encourage responsible reporting of security issues.
  • Provide more detailed security guidance and best practices in the documentation.

Security Requirements:

  • Authentication:
    • The framework should provide mechanisms for implementing secure user authentication, including support for various authentication methods (e.g., password-based, OAuth, JWT).
    • Session management should be secure, protecting against session hijacking and fixation attacks.
  • Authorization:
    • The framework should support role-based access control (RBAC) or other authorization mechanisms to restrict access to sensitive resources.
    • Authorization checks should be enforced consistently throughout the application.
  • Input Validation:
    • All user input should be validated rigorously to prevent injection attacks (e.g., SQL injection, NoSQL injection, command injection).
    • The framework should provide built-in validation mechanisms or integrate with popular validation libraries.
  • Cryptography:
    • Sensitive data should be encrypted both in transit (using HTTPS) and at rest (using appropriate encryption algorithms).
    • The framework should provide secure mechanisms for managing cryptographic keys.
    • Password should be hashed using strong, one-way hashing algorithms (e.g., bcrypt, Argon2).

DESIGN

C4 CONTEXT

graph LR
    User["User"] --> EggApp["Egg.js Application"]
    EggApp --> Database["Database"]
    EggApp --> ThirdPartyService["Third-party Services (e.g., APIs)"]
    EggApp --> Cache["Cache Server"]
    EggApp --> MessageQueue["Message Queue"]
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Element Descriptions:

  • Element:

    • Name: User
    • Type: Person
    • Description: A user interacting with the Egg.js application through a web browser or other client.
    • Responsibilities: Accessing application features, providing input, receiving output.
    • Security controls: Browser security features, network security.

  • Element:

    • Name: Egg.js Application
    • Type: Software System
    • Description: The web application built using the Egg.js framework.
    • Responsibilities: Handling user requests, processing data, interacting with other systems.
    • Security controls: egg-security plugin, secure coding practices, input validation, authentication, authorization.

  • Element:

    • Name: Database
    • Type: Software System
    • Description: The database used by the application to store persistent data.
    • Responsibilities: Storing and retrieving data, ensuring data integrity.
    • Security controls: Database access controls, encryption at rest, regular backups.

  • Element:

    • Name: Third-party Services
    • Type: Software System
    • Description: External services used by the application, such as payment gateways, email providers, or social media APIs.
    • Responsibilities: Providing specific functionalities as required by the application.
    • Security controls: Secure API communication (HTTPS), API keys, rate limiting.

  • Element:

    • Name: Cache Server
    • Type: Software System
    • Description: A caching system used to improve application performance.
    • Responsibilities: Storing frequently accessed data in memory for faster retrieval.
    • Security controls: Access controls, data validation.

  • Element:

    • Name: Message Queue
    • Type: Software System
    • Description: A message queue used for asynchronous communication between different parts of the application or with external systems.
    • Responsibilities: Handling asynchronous tasks, ensuring reliable message delivery.
    • Security controls: Access controls, message encryption.

C4 CONTAINER

graph LR
    User["User"] --> LoadBalancer["Load Balancer"]
    LoadBalancer --> WebServer1["Web Server (Node.js/Egg.js)"]
    LoadBalancer --> WebServer2["Web Server (Node.js/Egg.js)"]
    WebServer1 --> Database["Database"]
    WebServer1 --> Cache["Cache Server"]
    WebServer1 --> MessageQueue["Message Queue"]
    WebServer1 --> ThirdPartyService["Third-party Services"]
    WebServer2 --> Database["Database"]
    WebServer2 --> Cache["Cache Server"]
    WebServer2 --> MessageQueue["Message Queue"]
    WebServer2 --> ThirdPartyService["Third-party Services"]
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Element Descriptions:

  • Element:

    • Name: User
    • Type: Person
    • Description: A user interacting with the application.
    • Responsibilities: Accessing application features, providing input, receiving output.
    • Security controls: Browser security features, network security.

  • Element:

    • Name: Load Balancer
    • Type: Container
    • Description: Distributes incoming traffic across multiple web server instances.
    • Responsibilities: Ensuring high availability and scalability.
    • Security controls: SSL/TLS termination, DDoS protection.

  • Element:

    • Name: Web Server (Node.js/Egg.js)
    • Type: Container
    • Description: An instance of the Node.js application running the Egg.js framework.
    • Responsibilities: Handling user requests, processing data, interacting with other systems.
    • Security controls: egg-security plugin, secure coding practices, input validation, authentication, authorization.

  • Element:

    • Name: Database
    • Type: Container
    • Description: The database used by the application.
    • Responsibilities: Storing and retrieving data, ensuring data integrity.
    • Security controls: Database access controls, encryption at rest, regular backups.

  • Element:

    • Name: Cache Server
    • Type: Container
    • Description: The caching system.
    • Responsibilities: Storing frequently accessed data.
    • Security controls: Access controls, data validation.

  • Element:

    • Name: Message Queue
    • Type: Container
    • Description: The message queue system.
    • Responsibilities: Handling asynchronous tasks.
    • Security controls: Access controls, message encryption.

  • Element:

    • Name: Third-party Services
    • Type: Container
    • Description: External services used by the application.
    • Responsibilities: Providing specific functionalities.
    • Security controls: Secure API communication (HTTPS), API keys, rate limiting.

DEPLOYMENT

Possible Deployment Solutions:

  1. Traditional VM-based deployment (e.g., AWS EC2, Google Compute Engine, Azure VMs).
  2. Containerized deployment using Docker and Kubernetes (e.g., AWS EKS, Google Kubernetes Engine, Azure Kubernetes Service).
  3. Platform as a Service (PaaS) deployment (e.g., Heroku, AWS Elastic Beanstalk, Google App Engine).
  4. Serverless deployment using functions (e.g., AWS Lambda, Google Cloud Functions, Azure Functions).

Chosen Solution: Containerized deployment using Docker and Kubernetes.

graph LR
    Internet["Internet"] --> Ingress["Kubernetes Ingress"]
    Ingress --> Service["Kubernetes Service"]
    Service --> Pod1["Pod (Egg.js App Container)"]
    Service --> Pod2["Pod (Egg.js App Container)"]
    Pod1 --> Database["Database (e.g., PostgreSQL)"]
    Pod1 --> Cache["Cache (e.g., Redis)"]
    Pod2 --> Database["Database (e.g., PostgreSQL)"]
    Pod2 --> Cache["Cache (e.g., Redis)"]
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Element Descriptions:

  • Element:

    • Name: Internet
    • Type: Infrastructure Node
    • Description: The public internet.
    • Responsibilities: Routing traffic to the application.
    • Security controls: Network firewalls, DDoS protection.

  • Element:

    • Name: Kubernetes Ingress
    • Type: Infrastructure Node
    • Description: Entry point for external traffic into the Kubernetes cluster.
    • Responsibilities: Routing traffic to the appropriate Kubernetes Service.
    • Security controls: SSL/TLS termination, request filtering.

  • Element:

    • Name: Kubernetes Service
    • Type: Infrastructure Node
    • Description: Provides a stable endpoint for accessing the Egg.js application pods.
    • Responsibilities: Load balancing traffic across multiple pods.
    • Security controls: Network policies.

  • Element:

    • Name: Pod (Egg.js App Container)
    • Type: Container Instance
    • Description: A Kubernetes pod running the Docker container with the Egg.js application.
    • Responsibilities: Handling user requests, processing data.
    • Security controls: Container security context, resource limits.

  • Element:

    • Name: Database (e.g., PostgreSQL)
    • Type: Container Instance / Infrastructure Node
    • Description: The database instance. Could be a managed service or a separate pod.
    • Responsibilities: Storing and retrieving data.
    • Security controls: Database access controls, encryption at rest, regular backups.

  • Element:

    • Name: Cache (e.g., Redis)
    • Type: Container Instance / Infrastructure Node
    • Description: The cache instance. Could be a managed service or a separate pod.
    • Responsibilities: Storing frequently accessed data.
    • Security controls: Access controls, data validation.

BUILD

graph LR
    Developer["Developer"] --> GitCommit["Git Commit"]
    GitCommit --> CI["CI Server (e.g., GitHub Actions)"]
    CI --> Lint["Code Linting"]
    CI --> SAST["SAST Scanning"]
    CI --> Test["Unit/Integration Tests"]
    Lint --> Build["Build Application"]
    SAST --> Build
    Test --> Build
    Build --> DockerBuild["Docker Build"]
    DockerBuild --> DockerRegistry["Docker Registry"]
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Build Process Description:

  1. Developer commits code to a Git repository (e.g., GitHub, GitLab).
  2. A CI server (e.g., GitHub Actions, Jenkins) is triggered by the commit.
  3. The CI server runs a series of steps:
    • Code Linting: Checks code style and potential errors using tools like ESLint.
    • SAST Scanning: Performs static application security testing to identify vulnerabilities in the code.
    • Unit/Integration Tests: Executes automated tests to ensure code quality and functionality.
    • Build Application: Compiles the application code (if necessary) and packages it for deployment.
    • Docker Build: Creates a Docker image containing the application and its dependencies.
    • Docker Registry: Pushes the Docker image to a container registry (e.g., Docker Hub, AWS ECR, Google Container Registry).

Security Controls:

  • security control: Code linting helps enforce coding standards and prevent common errors.
  • security control: SAST scanning identifies vulnerabilities early in the development lifecycle.
  • security control: Automated tests ensure code quality and prevent regressions.
  • security control: Docker images provide a consistent and isolated environment for the application.
  • security control: Container registries provide a secure way to store and manage Docker images.
  • security control: Using signed commits and verifying them in CI.
  • security control: Using signed docker images.

RISK ASSESSMENT

Critical Business Processes:

  • User authentication and authorization.
  • Data storage and retrieval.
  • API request handling.
  • Asynchronous task processing.
  • Interaction with third-party services.

Data Sensitivity:

  • User data (e.g., usernames, passwords, email addresses, personal information): High sensitivity.
  • Application data (e.g., business data, financial transactions): Varies depending on the specific application, but potentially high sensitivity.
  • Configuration data (e.g., API keys, database credentials): High sensitivity.
  • Logs and audit trails: Medium sensitivity.

QUESTIONS & ASSUMPTIONS

Questions:

  • What specific types of applications are typically built with Egg.js (e.g., e-commerce, social media, internal tools)? This will help refine the risk assessment.
  • What are the specific performance and scalability requirements for applications built with Egg.js?
  • Are there any existing security audits or penetration testing reports available for Egg.js?
  • What is the process for reporting and addressing security vulnerabilities in Egg.js?
  • What level of support is provided for developers using Egg.js?

Assumptions:

  • BUSINESS POSTURE: Assumed that Egg.js aims to be a leading framework for enterprise Node.js development.
  • SECURITY POSTURE: Assumed that regular security audits and penetration testing are conducted.
  • DESIGN: Assumed a containerized deployment using Docker and Kubernetes as a common and recommended approach. Other deployment models are possible.
  • DESIGN: Assumed use of common supporting services like databases, caches, and message queues.
  • BUILD: Assumed use of a CI/CD pipeline with common security checks.