Skip to content

Latest commit

 

History

History
316 lines (250 loc) · 14.8 KB

sec-design.md

File metadata and controls

316 lines (250 loc) · 14.8 KB

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

BUSINESS POSTURE

Business Priorities and Goals:

  • Provide an easy-to-use, immediate-mode GUI library for Rust developers.
  • Enable rapid prototyping and development of interactive applications.
  • Offer a lightweight and portable solution, suitable for web and native platforms.
  • Maintain a clean and understandable codebase, encouraging community contributions.
  • Minimize external dependencies to reduce potential security and maintenance overhead.

Business Risks:

  • Malicious code injection through user-provided input (e.g., text fields, custom widgets).
  • Denial-of-service attacks targeting applications built with egui.
  • Cross-site scripting (XSS) vulnerabilities if egui is used to render untrusted content in a web context.
  • Data breaches if applications built with egui handle sensitive user data without proper security measures.
  • Supply chain attacks if dependencies of egui or build tools are compromised.
  • Reputational damage due to security vulnerabilities in egui or applications built with it.

SECURITY POSTURE

Existing Security Controls:

  • security control: The library is written in Rust, a memory-safe language, which inherently mitigates many common vulnerabilities like buffer overflows and use-after-free errors. (Source: Rust language design)
  • security control: The project appears to have a focus on minimizing external dependencies. (Source: Cargo.toml file and project philosophy)
  • security control: The project uses GitHub Actions for continuous integration, which can be configured to include security checks. (Source: .github/workflows directory)
  • security control: Clippy is used as linter. (Source: .github/workflows/rust.yml)
  • security control: cargo fmt is used to enforce consistent code style. (Source: .github/workflows/rust.yml)

Accepted Risks:

  • accepted risk: The library's immediate-mode nature means that developers are responsible for handling input sanitization and output encoding to prevent injection attacks. The library itself does not provide built-in mechanisms for this.
  • accepted risk: The library's focus on ease of use and portability may lead to developers overlooking security best practices when building applications.
  • accepted risk: The project relies on community contributions, which may introduce vulnerabilities if not thoroughly reviewed.

Recommended Security Controls:

  • security control: Integrate a static analysis tool (e.g., cargo audit, cargo deny) into the CI pipeline to automatically detect vulnerabilities in dependencies.
  • security control: Implement fuzz testing to identify potential vulnerabilities related to input handling.
  • security control: Provide clear documentation and examples on how to securely handle user input and output in egui applications.
  • security control: Establish a security policy and vulnerability disclosure process.
  • security control: Consider using a Content Security Policy (CSP) when deploying egui applications in a web context.

Security Requirements:

  • Authentication: egui itself does not handle authentication. Applications built with egui must implement their own authentication mechanisms if required.
  • Authorization: egui does not provide built-in authorization mechanisms. Applications must implement their own authorization logic.
  • Input Validation: Applications built with egui MUST thoroughly validate and sanitize all user-provided input to prevent injection attacks. egui provides basic input handling, but it is the application's responsibility to ensure that the input is safe.
  • Cryptography: egui does not provide cryptographic functions. Applications requiring cryptography must use appropriate Rust libraries.
  • Output Encoding: Applications built with egui and rendering to web targets MUST properly encode output to prevent XSS vulnerabilities.

DESIGN

C4 CONTEXT

graph LR
    User["User"]
    Egui["egui Application"]
    OperatingSystem["Operating System"]
    WebApplication["Web Application"]
    NativeApplication["Native Application"]
    BackendAPI["Backend API (Optional)"]

    User -- "Interacts with" --> Egui
    Egui -- "Runs on" --> OperatingSystem
    Egui -- "Deployed as" --> WebApplication
    Egui -- "Deployed as" --> NativeApplication
    Egui -- "Communicates with (Optional)" --> BackendAPI
Loading

Context Diagram Element List:

  • Element:

    • Name: User
    • Type: Person
    • Description: A person interacting with an application built using egui.
    • Responsibilities: Provides input, views output, interacts with the application's interface.
    • Security controls: None (external to the system).

  • Element:

    • Name: egui Application
    • Type: Software System
    • Description: An application built using the egui library.
    • Responsibilities: Renders the user interface, handles user input, manages application state.
    • Security controls: Relies on Rust's memory safety, input validation and output encoding performed by the application developer.

  • Element:

    • Name: Operating System
    • Type: Software System
    • Description: The underlying operating system on which the egui application runs (e.g., Windows, macOS, Linux, Web Browser).
    • Responsibilities: Provides resources and services to the application.
    • Security controls: OS-level security mechanisms (e.g., process isolation, memory protection).

  • Element:

    • Name: Web Application
    • Type: Software System
    • Description: An egui application compiled to WebAssembly and running in a web browser.
    • Responsibilities: Executes within the browser's sandbox, interacts with the DOM.
    • Security controls: Browser security mechanisms (e.g., same-origin policy, CSP).

  • Element:

    • Name: Native Application
    • Type: Software System
    • Description: An egui application compiled to native code and running directly on the operating system.
    • Responsibilities: Interacts directly with the operating system.
    • Security controls: OS-level security mechanisms.

  • Element:

    • Name: Backend API (Optional)
    • Type: Software System
    • Description: An optional backend API that the egui application may communicate with.
    • Responsibilities: Provides data and services to the egui application.
    • Security controls: Authentication, authorization, input validation, encryption (if applicable).

C4 CONTAINER

graph LR
    User["User"]
    EguiApp["egui Application"]
    RenderingBackend["Rendering Backend (e.g., wgpu, OpenGL, DirectX)"]
    OperatingSystem["Operating System"]
    WebApplication["Web Application"]
    NativeApplication["Native Application"]
    BackendAPI["Backend API (Optional)"]

    User -- "Interacts with" --> EguiApp
    EguiApp -- "Uses" --> RenderingBackend
    RenderingBackend -- "Interacts with" --> OperatingSystem
    EguiApp -- "Deployed as" --> WebApplication
    EguiApp -- "Deployed as" --> NativeApplication
    EguiApp -- "Communicates with (Optional)" --> BackendAPI
Loading

Container Diagram Element List:

  • Element:

    • Name: User
    • Type: Person
    • Description: A person interacting with an application built using egui.
    • Responsibilities: Provides input, views output, interacts with the application's interface.
    • Security controls: None (external to the system).

  • Element:

    • Name: egui Application
    • Type: Container
    • Description: The core application logic built using egui.
    • Responsibilities: Handles user input, manages application state, defines the UI layout.
    • Security controls: Relies on Rust's memory safety, input validation and output encoding performed by the application developer.

  • Element:

    • Name: Rendering Backend
    • Type: Container
    • Description: The graphics library used by egui to render the UI (e.g., wgpu, OpenGL, DirectX, or a web-based renderer).
    • Responsibilities: Translates egui's drawing commands into platform-specific graphics calls.
    • Security controls: Relies on the security of the underlying graphics library.

  • Element:

    • Name: Operating System
    • Type: Software System
    • Description: The underlying operating system.
    • Responsibilities: Provides resources and services.
    • Security controls: OS-level security mechanisms.

  • Element:

    • Name: Web Application
    • Type: Software System
    • Description: An egui application compiled to WebAssembly.
    • Responsibilities: Executes within the browser's sandbox.
    • Security controls: Browser security mechanisms.

  • Element:

    • Name: Native Application
    • Type: Software System
    • Description: An egui application compiled to native code.
    • Responsibilities: Interacts directly with the operating system.
    • Security controls: OS-level security mechanisms.

  • Element:

    • Name: Backend API (Optional)
    • Type: Container
    • Description: An optional backend API.
    • Responsibilities: Provides data and services.
    • Security controls: Authentication, authorization, input validation, encryption.

DEPLOYMENT

Possible Deployment Solutions:

  1. Native Application (Windows, macOS, Linux): Compiled executable distributed directly to users.
  2. Web Application (WebAssembly): Compiled to WebAssembly and served via a web server.
  3. Hybrid Approach: Native application using a web view (e.g., Tauri, Electron) to render the egui interface.

Chosen Solution (WebAssembly):

graph LR
    DeveloperMachine["Developer Machine"]
    BuildServer["Build Server (GitHub Actions)"]
    WebServer["Web Server (e.g., Netlify, GitHub Pages)"]
    UserBrowser["User Browser"]

    DeveloperMachine -- "Pushes code" --> BuildServer
    BuildServer -- "Compiles to WebAssembly" --> WebAssemblyArtifact["WebAssembly Artifact"]
    WebAssemblyArtifact -- "Deployed to" --> WebServer
    WebServer -- "Serves" --> UserBrowser
Loading

Deployment Diagram Element List:

  • Element:

    • Name: Developer Machine
    • Type: Infrastructure Node
    • Description: The developer's local machine.
    • Responsibilities: Code development, testing, local builds.
    • Security controls: Developer machine security best practices.

  • Element:

    • Name: Build Server (GitHub Actions)
    • Type: Infrastructure Node
    • Description: The CI/CD server running GitHub Actions.
    • Responsibilities: Automated builds, testing, deployment.
    • Security controls: GitHub Actions security best practices, secrets management.

  • Element:

    • Name: WebAssembly Artifact
    • Type: Artifact
    • Description: The compiled WebAssembly module and associated files.
    • Responsibilities: Contains the executable code for the egui application.
    • Security controls: Code signing (if applicable).

  • Element:

    • Name: Web Server (e.g., Netlify, GitHub Pages)
    • Type: Infrastructure Node
    • Description: The web server hosting the WebAssembly application.
    • Responsibilities: Serves the WebAssembly files to users.
    • Security controls: Web server security best practices, HTTPS, CSP.

  • Element:

    • Name: User Browser
    • Type: Infrastructure Node
    • Description: The user's web browser.
    • Responsibilities: Executes the WebAssembly application.
    • Security controls: Browser security mechanisms (same-origin policy, sandboxing).

BUILD

graph LR
    Developer["Developer"]
    CodeRepository["Code Repository (GitHub)"]
    CI_CD["CI/CD (GitHub Actions)"]
    Linters["Linters (Clippy, rustfmt)"]
    Tests["Tests (cargo test)"]
    Compiler["Compiler (rustc)"]
    WebAssemblyArtifact["WebAssembly Artifact"]
    NativeArtifact["Native Artifact (Optional)"]

    Developer -- "Pushes code" --> CodeRepository
    CodeRepository -- "Triggers" --> CI_CD
    CI_CD -- "Runs" --> Linters
    CI_CD -- "Runs" --> Tests
    CI_CD -- "Runs" --> Compiler
    Compiler -- "Produces" --> WebAssemblyArtifact
    Compiler -- "Produces" --> NativeArtifact
Loading

Build Process Description:

  1. Developer pushes code changes to the GitHub repository.
  2. GitHub Actions triggers a workflow.
  3. Linters (clippy, rustfmt) are run to check code style and potential errors.
  4. Tests (cargo test) are executed to ensure code correctness.
  5. The Rust compiler (rustc) compiles the code to WebAssembly (and optionally native targets).
  6. Build artifacts (WebAssembly module, native executables) are produced.

Security Controls:

  • security control: Linting with clippy and rustfmt helps identify potential code quality and security issues.
  • security control: Automated testing with cargo test helps ensure code correctness and prevent regressions.
  • security control: GitHub Actions provides a secure and controlled environment for building the application.
  • security control: Dependency management with Cargo helps track and manage dependencies.
  • security control: (Recommended) Integration of static analysis tools (e.g., cargo audit, cargo deny) to detect vulnerabilities in dependencies.

RISK ASSESSMENT

Critical Business Processes:

  • Providing a functional and reliable GUI library for developers.
  • Maintaining the reputation and trust of the egui project.
  • Ensuring the security of applications built with egui.

Data to Protect:

  • Source code of the egui library (sensitivity: medium - public repository, but integrity is important).
  • User data handled by applications built with egui (sensitivity: varies depending on the application - potentially high). egui itself does not directly handle user data, but applications built with it might.
  • Build artifacts (sensitivity: medium - integrity is important to prevent distribution of malicious code).

QUESTIONS & ASSUMPTIONS

Questions:

  • Are there any specific compliance requirements (e.g., GDPR, HIPAA) that applications built with egui are expected to meet?
  • What is the expected threat model for typical egui applications (e.g., web applications, desktop applications, embedded systems)?
  • What level of security expertise is expected from developers using egui?
  • Are there plans to add any built-in security features to egui in the future?

Assumptions:

  • BUSINESS POSTURE: The primary goal is to provide a user-friendly and versatile GUI library, with security being a significant but not overriding concern.
  • SECURITY POSTURE: Developers using egui are responsible for implementing appropriate security measures in their applications. egui provides a foundation, but it does not guarantee application security.
  • DESIGN: The deployment model will vary depending on the specific application. The WebAssembly deployment model is chosen as a representative example. The build process relies on GitHub Actions for automation and security.