Skip to content

Latest commit

 

History

History
266 lines (210 loc) · 14.9 KB

sec-design.md

File metadata and controls

266 lines (210 loc) · 14.9 KB

Okay, let's create a design document for the Anime.js project, focusing on aspects relevant for threat modeling.

BUSINESS POSTURE

Anime.js is a JavaScript animation library. It's an open-source project, likely aiming for wide adoption and community contribution. The primary business goals are likely:

  • Ease of Use: Make animation simple and intuitive for developers of all skill levels.
  • Performance: Provide smooth and efficient animations, even with complex scenarios.
  • Flexibility: Support a wide range of animation targets (DOM elements, SVG, JavaScript objects) and properties.
  • Community Growth: Foster an active and engaged community around the library.
  • Reputation: Maintain a positive reputation for quality, reliability, and responsiveness to issues.

Based on these goals, the most important business risks are:

  • Malicious Code Injection: A compromised version of the library (e.g., through a supply chain attack or a compromised dependency) could be used to inject malicious code into websites using Anime.js. This is the highest risk.
  • Denial of Service (DoS): While less likely to be targeted directly, vulnerabilities in the library could potentially be exploited to cause performance issues or crashes in applications using it.
  • Reputational Damage: Security vulnerabilities, even if not actively exploited, could damage the library's reputation and discourage adoption.
  • Intellectual Property Theft: While open-source, there might be concerns about unauthorized commercial use or modification without attribution (though this is mitigated by the MIT license).

SECURITY POSTURE

The provided GitHub repository gives us insights into the existing security controls and accepted risks.

  • security control: MIT License: The project uses the MIT license, which is permissive and allows for broad use, modification, and distribution. (Found in the LICENSE file).
  • security control: Dependency Management: The project uses a package manager (likely npm or yarn, based on the presence of package.json) to manage dependencies. (Found in package.json).
  • security control: Code Style and Linting: The presence of configuration files like .eslintrc.js and .prettierrc.js suggests the use of linters and code formatters to maintain code quality and potentially catch some basic errors. (Found in root directory).
  • security control: Testing: The project includes a test directory, indicating the presence of automated tests. The extent and coverage of these tests would need further investigation. (Found in test directory).
  • accepted risk: Limited Formal Security Reviews: There's no explicit mention of formal security audits or penetration testing. This is common for open-source projects, but it's an accepted risk.
  • accepted risk: Dependency Vulnerabilities: While dependencies are managed, there's always a risk of vulnerabilities in third-party libraries. This is a common and generally accepted risk, mitigated by staying up-to-date.
  • accepted risk: User-Controlled Input: Anime.js inherently deals with user-provided input (animation parameters, target elements, etc.). This introduces a risk of misuse, though the library's design likely mitigates many direct injection vulnerabilities.

Recommended Security Controls (High Priority):

  • security control: Supply Chain Security: Implement measures to verify the integrity of dependencies. This could include using tools like npm audit or yarn audit, and potentially using tools for Software Composition Analysis (SCA).
  • security control: Security-Focused Code Review: Integrate security considerations into the code review process. Encourage contributors to think about potential security implications of their changes.
  • security control: Fuzz Testing: Consider adding fuzz testing to the test suite. Fuzz testing can help identify unexpected behavior and potential vulnerabilities by providing random or malformed input to the library.

Security Requirements:

  • Authentication: Not directly applicable to this library, as it doesn't handle user authentication.
  • Authorization: Not directly applicable, as the library doesn't manage user roles or permissions.
  • Input Validation:
    • The library should gracefully handle invalid or unexpected input values for animation parameters (e.g., non-numeric values for durations, invalid CSS property names).
    • The library should sanitize or escape any user-provided input that is used to construct DOM elements or modify attributes, to prevent potential XSS vulnerabilities (though this is less of a concern as Anime.js primarily manipulates existing elements).
  • Cryptography: Not directly applicable, as the library doesn't handle sensitive data requiring encryption.

DESIGN

C4 CONTEXT

graph LR
    User["User/Developer"] -- Uses --> AnimeJS["Anime.js Library"]
    AnimeJS -- Manipulates --> DOM["DOM/Browser"]
    AnimeJS -- Manipulates --> JSObjects["JavaScript Objects"]
    AnimeJS -- Manipulates --> SVG["SVG Elements"]
    AnimeJS -- Uses --> Dependencies["Third-party Dependencies"]
Loading

Element Descriptions:

  • Element:

    • Name: User/Developer
    • Type: Person
    • Description: A web developer who integrates Anime.js into their website or application.
    • Responsibilities: Provides animation parameters and target elements to Anime.js.
    • Security controls: None (external to the library).

  • Element:

    • Name: Anime.js Library
    • Type: Software System
    • Description: The core Anime.js library, providing animation functionality.
    • Responsibilities: Parses animation parameters, manages animation timelines, updates target element properties.
    • Security controls: Input validation, dependency management, code style/linting, testing.

  • Element:

    • Name: DOM/Browser
    • Type: External System
    • Description: The web browser's Document Object Model.
    • Responsibilities: Renders the web page and provides an interface for manipulating elements.
    • Security controls: Browser's built-in security mechanisms (e.g., same-origin policy, XSS protection).

  • Element:

    • Name: JavaScript Objects
    • Type: External System
    • Description: Plain JavaScript objects that can be animated.
    • Responsibilities: Store data that can be animated by Anime.js.
    • Security controls: None (managed by the user's code).

  • Element:

    • Name: SVG Elements
    • Type: External System
    • Description: Scalable Vector Graphics elements within the DOM.
    • Responsibilities: Render vector graphics and provide an interface for manipulating their properties.
    • Security controls: Browser's built-in security mechanisms for SVG.

  • Element:

    • Name: Third-party Dependencies
    • Type: External System
    • Description: External libraries used by Anime.js (if any).
    • Responsibilities: Provide functionality required by Anime.js.
    • Security controls: Managed through dependency management tools (e.g., npm audit).

C4 CONTAINER

Since Anime.js is a single library, the container diagram is essentially the same as the context diagram, with the addition of internal modules.

graph LR
    User["User/Developer"] -- Uses --> AnimeJS["Anime.js Library"]
    AnimeJS -- Manipulates --> DOM["DOM/Browser"]
    AnimeJS -- Manipulates --> JSObjects["JavaScript Objects"]
    AnimeJS -- Manipulates --> SVG["SVG Elements"]
    AnimeJS -- Uses --> Dependencies["Third-party Dependencies"]
    subgraph AnimeJS
        Core["Core Animation Engine"]
        Helpers["Helper Functions"]
        Easing["Easing Functions"]
        Core -- Uses --> Helpers
        Core -- Uses --> Easing
    end
Loading

Element Descriptions:

  • Elements from Context Diagram are the same.

  • Element:

    • Name: Core Animation Engine
    • Type: Component
    • Description: The main module responsible for parsing parameters, managing timelines, and updating values.
    • Responsibilities: Core animation logic.
    • Security controls: Input validation.

  • Element:

    • Name: Helper Functions
    • Type: Component
    • Description: Utility functions used by the core engine.
    • Responsibilities: Provide common functionality (e.g., unit conversion, value parsing).
    • Security controls: Input validation (where applicable).

  • Element:

    • Name: Easing Functions
    • Type: Component
    • Description: Functions that define the rate of change of animation parameters over time.
    • Responsibilities: Calculate intermediate values for animations.
    • Security controls: None (mathematical functions).

DEPLOYMENT

Anime.js is a JavaScript library, so deployment typically involves including it in a web page or application. Several deployment options exist:

  1. Direct Download: Download the anime.min.js file and include it in the project's directory structure.
  2. CDN: Use a Content Delivery Network (CDN) like jsDelivr or unpkg to include Anime.js without hosting it yourself.
  3. Package Manager: Install Anime.js using a package manager like npm or yarn, and then bundle it with the application's code using a build tool like Webpack or Parcel.

We'll describe the Package Manager approach, as it's the most common for modern web development and allows for better dependency management.

graph LR
    DevMachine["Developer Machine"] -- "npm install animejs" --> NPMRegistry["NPM Registry"]
    NPMRegistry -- "anime.min.js + dependencies" --> DevMachine
    DevMachine -- "Build Process (Webpack/Parcel)" --> BuildServer["Build Server"]
    BuildServer -- "Bundled Application Code" --> WebServer["Web Server"]
    WebServer -- "Serves to" --> UserBrowser["User's Browser"]
Loading

Element Descriptions:

  • Element:

    • Name: Developer Machine
    • Type: Infrastructure Node
    • Description: The developer's local machine.
    • Responsibilities: Writing code, installing dependencies, running build tools.
    • Security controls: Developer's own security practices.

  • Element:

    • Name: NPM Registry
    • Type: External System
    • Description: The public npm registry, hosting open-source JavaScript packages.
    • Responsibilities: Providing access to Anime.js and its dependencies.
    • Security controls: npm's security measures (e.g., package signing, vulnerability scanning).

  • Element:

    • Name: Build Server
    • Type: Infrastructure Node
    • Description: A server (or local machine) that runs the build process.
    • Responsibilities: Bundling the application code, including Anime.js.
    • Security controls: Secure configuration of the build environment, dependency checking.

  • Element:

    • Name: Web Server
    • Type: Infrastructure Node
    • Description: The server that hosts the web application.
    • Responsibilities: Serving the bundled application code to users.
    • Security controls: Standard web server security practices (e.g., HTTPS, firewalls).

  • Element:

    • Name: User's Browser
    • Type: External System
    • Description: The user's web browser.
    • Responsibilities: Rendering the web page and executing the JavaScript code, including Anime.js.
    • Security controls: Browser's built-in security mechanisms.

BUILD

The build process for Anime.js, based on the repository, likely involves the following steps:

  1. Development: Developers write code and tests on their local machines.
  2. Dependency Installation: Dependencies are installed using npm install (or yarn install).
  3. Linting and Formatting: Code is checked for style and potential errors using ESLint and Prettier.
  4. Testing: Automated tests are run to ensure code quality.
  5. Bundling/Minification: The code is likely bundled and minified using a tool like Rollup or Webpack (based on common practices, though not explicitly stated in the provided repository information). This creates the anime.min.js file.
  6. Publishing (to npm): The library is published to the npm registry, making it available for others to install.
graph LR
    Developer["Developer"] -- "Writes Code" --> LocalMachine["Local Machine"]
    LocalMachine -- "npm install" --> NPM["NPM Registry"]
    NPM -- "Dependencies" --> LocalMachine
    LocalMachine -- "Linting (ESLint)" --> Linting
    LocalMachine -- "Formatting (Prettier)" --> Formatting
    LocalMachine -- "Testing" --> Testing
    LocalMachine -- "Bundling/Minification (Rollup/Webpack)" --> Bundler
    Bundler -- "anime.min.js" --> Artifacts["Build Artifacts"]
    Artifacts -- "npm publish" --> NPM
Loading

Security Controls in the Build Process:

  • security control: Dependency Management: Using npm or yarn to manage dependencies.
  • security control: Linting: Using ESLint to catch potential errors and enforce code style.
  • security control: Formatting: Using Prettier to maintain consistent code formatting.
  • security control: Testing: Running automated tests to verify code correctness.
  • security control: (Recommended) npm audit or yarn audit: Running these commands during the build process to check for known vulnerabilities in dependencies.
  • security control: (Recommended) Software Composition Analysis (SCA): Using a dedicated SCA tool for more in-depth dependency analysis.

RISK ASSESSMENT

  • Critical Business Process: Delivering animations to users' browsers without compromising their security or the application's performance.
  • Data to Protect:
    • Source Code: While open-source, unauthorized modification or distribution of a compromised version is a risk. Sensitivity: Low (publicly available).
    • User Data (Indirectly): Anime.js itself doesn't directly handle user data. However, a compromised version could be used to exfiltrate user data from the application using it. Sensitivity: Potentially High (depending on the application).
    • Dependencies: The integrity of the dependencies is crucial. Sensitivity: Medium (impacts the library's security).

QUESTIONS & ASSUMPTIONS

  • Questions:

    • What is the exact build process (e.g., which bundler is used)?
    • What is the test coverage of the automated tests?
    • Are there any specific security concerns raised by the community or in past issues?
    • Are there any plans for formal security reviews or audits?
    • Is there a process for handling security vulnerability reports?

  • Assumptions:

    • BUSINESS POSTURE: The primary goal is to provide a widely used, reliable, and performant animation library.
    • SECURITY POSTURE: The project follows common open-source security practices, but may not have dedicated security resources.
    • DESIGN: The library is designed to be efficient and minimize potential attack surfaces, but inherent risks exist due to its interaction with the DOM and user-provided input. The build process uses standard JavaScript tooling.
    • The project uses Rollup or Webpack for building and bundling.
    • The project uses npm for publishing.
    • The project has automated tests.
    • The project has linting and formatting setup.