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sec-design.md

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Okay, let's create a design document for the provided GitHub repository.

BUSINESS POSTURE

Business Priorities and Goals:

  • Provide a functional example of using Swift programming language on iOS.
  • Demonstrate a simple "Hello World" application.
  • Serve as a basic template or starting point for iOS development with Swift.
  • Educational purpose: help developers learn the basics of Swift on iOS.

Most Important Business Risks:

  • The application might contain vulnerabilities that could be exploited, although the impact is likely low given its simplicity.
  • The example code might be outdated, leading to compatibility issues or promoting insecure practices.
  • Lack of documentation could hinder understanding and adoption.

SECURITY POSTURE

Existing Security Controls:

  • security control: The project uses Swift, a memory-safe language, which inherently protects against many common vulnerabilities like buffer overflows. (Source code)
  • security control: The project is a simple "Hello World" application, minimizing the attack surface. (Source code)

Accepted Risks:

  • accepted risk: The project does not implement explicit security controls beyond the inherent safety of Swift.
  • accepted risk: The project may not follow all the latest security best practices for iOS development, as it's a very basic example.
  • accepted risk: The project does not include any input validation, as there is no user input.

Recommended Security Controls:

  • security control: Integrate a Static Application Security Testing (SAST) tool into the build process to identify potential vulnerabilities early.
  • security control: If the project evolves to include user input or network communication, implement appropriate input validation and output encoding.
  • security control: Consider using a dependency management system (like Swift Package Manager) and regularly update dependencies to address known vulnerabilities.
  • security control: Add code signing to ensure the integrity of the application.

Security Requirements:

  • Authentication: Not applicable for this simple "Hello World" application.
  • Authorization: Not applicable for this simple "Hello World" application.
  • Input Validation: Not applicable, as there is no user input.
  • Cryptography: Not applicable for this simple "Hello World" application.

DESIGN

C4 CONTEXT

graph LR
    User["User"]
    SwiftOnIOS["Swift on iOS App"]

    User -- "Uses" --> SwiftOnIOS
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Element Description:

  • User
    • Name: User
    • Type: Person
    • Description: A person interacting with the iOS device.
    • Responsibilities: Runs the "Swift on iOS" application.
    • Security controls: None (relies on the device's security).
  • Swift on iOS App
    • Name: Swift on iOS App
    • Type: Software System
    • Description: A simple "Hello World" application written in Swift.
    • Responsibilities: Displays "Hello World" on the screen.
    • Security controls: Leverages Swift's memory safety features.

C4 CONTAINER

graph LR
    User["User"]
    App["iOS App"]

    User -- "Uses" --> App
Loading

Element Description:

  • User
    • Name: User
    • Type: Person
    • Description: A person interacting with the iOS device.
    • Responsibilities: Runs the "Swift on iOS" application.
    • Security controls: None (relies on the device's security).
  • iOS App
    • Name: iOS App
    • Type: Mobile App
    • Description: The compiled Swift code running as an iOS application.
    • Responsibilities: Displays "Hello World" on the screen.
    • Security controls: Leverages Swift's memory safety features; runs within the iOS sandbox.

DEPLOYMENT

Possible deployment solutions:

  1. Direct deployment to a physical iOS device via Xcode.
  2. Deployment via TestFlight for beta testing.
  3. Deployment to the App Store for public release.

Chosen solution (for detailed description): Direct deployment to a physical iOS device via Xcode.

graph LR
    DeveloperMachine["Developer Machine\n(macOS with Xcode)"]
    IOSDevice["iOS Device"]

    DeveloperMachine -- "Deploys via USB" --> IOSDevice
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Element Description:

  • Developer Machine
    • Name: Developer Machine
    • Type: Development Environment
    • Description: A macOS machine with Xcode installed.
    • Responsibilities: Compiles the Swift code, builds the iOS application, and deploys it to the connected iOS device.
    • Security controls: Relies on macOS security features; Xcode code signing.
  • iOS Device
    • Name: iOS Device
    • Type: Mobile Device
    • Description: A physical iPhone or iPad.
    • Responsibilities: Runs the deployed iOS application.
    • Security controls: iOS sandbox, operating system security features.

BUILD

The build process involves using Xcode on a macOS machine.

graph LR
    Developer["Developer"]
    SourceCode["Source Code\n(Swift)"]
    Xcode["Xcode"]
    BuildArtifact["Build Artifact\n(.ipa file)"]
    IOSDevice["iOS Device"]

    Developer -- "Writes code" --> SourceCode
    SourceCode -- "Compiles & Builds" --> Xcode
    Xcode -- "Creates" --> BuildArtifact
    Xcode -- "Deploys" --> IOSDevice
Loading

Build Process Description:

  1. Developer writes Swift code.
  2. The code is compiled and built using Xcode.
  3. Xcode creates a build artifact (.ipa file).
  4. Xcode can deploy the .ipa file to a connected iOS device or prepare it for distribution.

Security Controls in Build Process:

  • security control: Xcode's built-in compiler performs static analysis and provides warnings/errors for potential issues.
  • security control: Code signing with a developer certificate ensures the app's integrity and authenticity (during deployment).
  • security control: (Recommended) Integrate a SAST tool into the Xcode build process or a separate CI/CD pipeline.

RISK ASSESSMENT

Critical Business Processes:

  • Demonstrating a basic Swift application on iOS.
  • Providing a starting point for learning.

Data Protection:

  • There is no sensitive data handled by this application. The application does not collect, store, or transmit any user data.

QUESTIONS & ASSUMPTIONS

Questions:

  • Will this application be extended in the future to include more features (user input, network communication, etc.)?
  • What is the target audience for this example (beginner developers, experienced developers)?
  • Is there a specific version of iOS or Swift that this example should target?

Assumptions:

  • BUSINESS POSTURE: The primary goal is education and demonstration, not production use.
  • SECURITY POSTURE: The application is assumed to be low-risk due to its simplicity. No sensitive data is handled.
  • DESIGN: The deployment model is assumed to be direct deployment via Xcode for development and testing purposes. The build process relies on Xcode's built-in capabilities.