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BUSINESS POSTURE

  • Business Priorities:

    • Provide a reusable, customizable, and easy-to-integrate progress indicator for iOS applications.
    • Ensure the library is lightweight and performs well to avoid impacting application responsiveness.
    • Maintain compatibility with a wide range of iOS versions and devices.
    • Offer a visually appealing and user-friendly progress HUD to enhance user experience.

  • Business Goals:

    • Increase developer productivity by providing a ready-made solution for displaying progress.
    • Improve the visual consistency of progress indicators across different iOS applications.
    • Reduce development time and effort associated with creating custom progress HUDs.
    • Establish the library as a popular and trusted choice for iOS developers.

  • Business Risks:

    • Library defects leading to application crashes or unexpected UI behavior, negatively impacting user experience.
    • Security vulnerabilities within the library that could be exploited by malicious actors through applications using the library.
    • Performance issues in the library causing application slowdowns or battery drain.
    • Lack of ongoing maintenance and updates resulting in incompatibility with newer iOS versions or security vulnerabilities remaining unpatched.
    • Adoption risk if the library is perceived as too complex, poorly documented, or unreliable.

SECURITY POSTURE

  • Existing Security Controls:

    • security control: Open Source Code: The library is open source, allowing for community review and scrutiny of the codebase. This transparency can help identify potential security vulnerabilities. Implemented in: GitHub repository.
    • security control: Objective-C Language: The library is written in Objective-C, a mature language with well-established security best practices. Implemented in: Source code.
    • security control: Standard iOS SDK: The library likely relies on standard and well-vetted iOS SDK components, which are generally considered secure. Implemented in: Library dependencies.
    • security control: CocoaPods/Swift Package Manager: Distribution through package managers like CocoaPods and Swift Package Manager provides a degree of dependency management and version control. Implemented in: Project build and distribution configuration.

  • Accepted Risks:

    • accepted risk: Community-Driven Security: Reliance on the open-source community for security audits and vulnerability reporting means there is no dedicated security team actively monitoring the library.
    • accepted risk: Third-Party Dependency Vulnerabilities: While unlikely for a UI library, there's a general risk of vulnerabilities in any third-party dependencies, however minimal.
    • accepted risk: Delayed Patching: Vulnerability patching relies on maintainer availability and community reporting, which might lead to delays in addressing discovered issues.

  • Recommended Security Controls:

    • security control: Static Application Security Testing (SAST): Implement SAST tools in the development process to automatically scan the codebase for potential security vulnerabilities.
    • security control: Dependency Scanning: Although dependencies are minimal, perform dependency scanning to ensure no known vulnerable components are included.
    • security control: Regular Security Audits: Conduct periodic security audits, potentially by external security experts, to proactively identify and address potential vulnerabilities.
    • security control: Secure Development Practices: Follow secure coding practices during development, including input validation and secure handling of any configuration data.
    • security control: Security Response Plan: Establish a clear process for handling security vulnerability reports, including patching and public disclosure.

  • Security Requirements:

    • Authentication: Not applicable. This library is a UI component and does not handle user authentication.
    • Authorization: Not applicable. This library does not handle user authorization or access control.
    • Input Validation:
      • Requirement: Validate all configuration parameters passed to the library to prevent unexpected behavior or crashes.
      • Requirement: Ensure that input validation handles various data types and edge cases correctly.
      • Requirement: Sanitize any input that is displayed to the user to prevent potential UI injection vulnerabilities (though unlikely in this context).
    • Cryptography: Not applicable. This library does not require cryptographic operations.

DESIGN

  • C4 CONTEXT
graph LR
    subgraph "iOS Application Context"
    MBProgressHUD["MBProgressHUD Library"]
    iOSAppDeveloper["iOS App Developer"]
    iOSSDK["iOS SDK"]
    end

    iOSAppDeveloper --> MBProgressHUD: Integrates and Configures
    MBProgressHUD --> iOSSDK: Uses SDK Components
    iOSAppDeveloper -- Uses --> iOSSDK: Develops with
    MBProgressHUD -- Used by --> iOSApp: Embedded in
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  • C4 CONTEXT Elements:

      • Name: iOS App Developer
      • Type: Person
      • Description: Developers who build iOS applications and want to display progress indicators to users.
      • Responsibilities: Integrate the MBProgressHUD library into their iOS applications, configure its appearance and behavior, and use it to display progress during operations.
      • Security controls: Responsible for securely integrating and using the library within their applications, following secure coding practices in their own application code.
      • Name: MBProgressHUD Library
      • Type: Software System
      • Description: An open-source library providing customizable progress HUD (Heads-Up Display) views for iOS applications.
      • Responsibilities: Display progress indicators to users in iOS applications, offering various styles and customization options.
      • Security controls: Implement input validation for configuration parameters, adhere to secure coding practices, and address reported security vulnerabilities.
      • Name: iOS SDK
      • Type: Software System
      • Description: Apple's Software Development Kit for building iOS applications, providing frameworks and APIs used by MBProgressHUD.
      • Responsibilities: Provide core functionalities and APIs for iOS applications, including UI components, drawing, and system services.
      • Security controls: Apple is responsible for the security of the iOS SDK, including regular updates and security patches.

  • C4 CONTAINER

graph LR
    subgraph "iOS Application Context"
    MBProgressHUD_Framework["MBProgressHUD.framework"]
    iOSSDK["iOS SDK"]
    end

    MBProgressHUD_Framework --> iOSSDK: Uses SDK Frameworks
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  • C4 CONTAINER Elements:

      • Name: MBProgressHUD.framework
      • Type: Framework
      • Description: The compiled Objective-C framework containing the MBProgressHUD library code, ready to be integrated into iOS applications.
      • Responsibilities: Provide the progress HUD functionality to iOS applications through its classes and APIs.
      • Security controls: Implements input validation, follows secure coding practices, and is built using secure build processes.
      • Name: iOS SDK
      • Type: Framework Collection
      • Description: Collection of frameworks provided by Apple for iOS development, used by MBProgressHUD.framework.
      • Responsibilities: Provides underlying functionalities for UI rendering, system interactions, and other core features used by the MBProgressHUD framework.
      • Security controls: Security is managed by Apple through the iOS SDK development and update process.

  • DEPLOYMENT

graph LR
    subgraph "iOS Device"
    iOSApplication["iOS Application"]
    MBProgressHUD_Embedded["MBProgressHUD.framework (Embedded)"]
    iOSOperatingSystem["iOS Operating System"]
    end

    iOSApplication --> MBProgressHUD_Embedded: Uses
    MBProgressHUD_Embedded --> iOSOperatingSystem: Runs on
    iOSApplication --> iOSOperatingSystem: Runs on
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  • DEPLOYMENT Elements:

      • Name: iOS Device
      • Type: Environment
      • Description: The target environment where iOS applications using MBProgressHUD are deployed and run, such as iPhones and iPads.
      • Responsibilities: Execute iOS applications and provide the runtime environment for MBProgressHUD.
      • Security controls: Security of the iOS device is managed by Apple through iOS updates and device security features.
      • Name: iOS Application
      • Type: Software
      • Description: An iOS application that integrates and uses the MBProgressHUD library to display progress indicators to its users.
      • Responsibilities: Provide application-specific functionality to end-users, including using MBProgressHUD to enhance user experience.
      • Security controls: Application developers are responsible for the overall security of their iOS applications, including secure usage of third-party libraries like MBProgressHUD.
      • Name: MBProgressHUD.framework (Embedded)
      • Type: Library
      • Description: The MBProgressHUD framework embedded within an iOS application package.
      • Responsibilities: Provide progress HUD functionality within the context of the deployed iOS application.
      • Security controls: Inherits security controls from the build and development process, and is subject to the security context of the iOS application it is embedded in.
      • Name: iOS Operating System
      • Type: Operating System
      • Description: Apple's iOS operating system running on the iOS device.
      • Responsibilities: Manage device resources, provide system services, and enforce security policies for applications running on the device.
      • Security controls: Apple is responsible for the security of the iOS operating system, including kernel security, sandboxing, and permission management.

  • BUILD

graph LR
    subgraph "Developer Environment"
    Developer["Developer"]
    SourceCode["Source Code (GitHub)"]
    Xcode["Xcode IDE"]
    end

    subgraph "Build Environment"
    BuildSystem["Build System (e.g., GitHub Actions)"]
    SASTScanner["SAST Scanner"]
    DependencyScanner["Dependency Scanner"]
    end

    subgraph "Distribution"
    PackageManagers["Package Managers (CocoaPods, SPM)"]
    MBProgressHUD_Artifact["MBProgressHUD Artifact (Framework)"]
    end

    Developer --> SourceCode: Commits Code
    SourceCode --> BuildSystem: Triggers Build
    BuildSystem --> Xcode: Builds Framework
    BuildSystem --> SASTScanner: Scans Code
    BuildSystem --> DependencyScanner: Scans Dependencies
    Xcode --> MBProgressHUD_Artifact: Creates Artifact
    BuildSystem --> PackageManagers: Publishes Artifact
    PackageManagers --> Developer: Integrates Library
    style SASTScanner fill:#f9f,stroke:#333,stroke-width:2px
    style DependencyScanner fill:#f9f,stroke:#333,stroke-width:2px
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  • BUILD Elements:
      • Name: Developer
      • Type: Person
      • Description: Software developer contributing to the MBProgressHUD library.
      • Responsibilities: Write code, fix bugs, implement new features, and commit code changes to the source code repository.
      • Security controls: Follow secure coding practices, perform local testing, and participate in code reviews.
      • Name: Source Code (GitHub)
      • Type: Code Repository
      • Description: GitHub repository hosting the source code of the MBProgressHUD library.
      • Responsibilities: Version control, code storage, collaboration platform for development.
      • Security controls: GitHub provides access control, audit logs, and vulnerability scanning for the repository itself.
      • Name: Xcode IDE
      • Type: Integrated Development Environment
      • Description: Apple's IDE used for developing and building iOS applications and libraries, including MBProgressHUD.
      • Responsibilities: Code editing, compilation, building, testing, and debugging of the MBProgressHUD library.
      • Security controls: Xcode provides code signing capabilities and integrates with Apple's security tools.
      • Name: Build System (e.g., GitHub Actions)
      • Type: Automation System
      • Description: Automated build system used to compile, test, and package the MBProgressHUD library. Could be GitHub Actions or other CI/CD tools.
      • Responsibilities: Automate the build process, run tests, perform security scans, and publish build artifacts.
      • Security controls: Implement security controls in the build pipeline, such as SAST and dependency scanning, and secure artifact storage.
      • Name: SAST Scanner
      • Type: Security Tool
      • Description: Static Application Security Testing tool used to automatically analyze the source code for potential security vulnerabilities during the build process.
      • Responsibilities: Identify potential security flaws in the code without executing it.
      • Security controls: Configuration and maintenance of the SAST scanner, and remediation of identified vulnerabilities.
      • Name: Dependency Scanner
      • Type: Security Tool
      • Description: Tool used to scan project dependencies for known vulnerabilities during the build process.
      • Responsibilities: Identify vulnerable dependencies used by the library.
      • Security controls: Configuration and maintenance of the dependency scanner, and updating or replacing vulnerable dependencies.
      • Name: MBProgressHUD Artifact (Framework)
      • Type: Build Artifact
      • Description: The compiled MBProgressHUD.framework, ready for distribution and integration into iOS applications.
      • Responsibilities: Provide the distributable form of the MBProgressHUD library.
      • Security controls: Artifact signing and secure storage of the built framework.
      • Name: Package Managers (CocoaPods, SPM)
      • Type: Distribution Platform
      • Description: Package managers like CocoaPods and Swift Package Manager used to distribute and manage dependencies for iOS projects, including MBProgressHUD.
      • Responsibilities: Distribute the MBProgressHUD library to iOS developers, manage versions, and handle dependency resolution.
      • Security controls: Package managers provide mechanisms for package integrity verification and secure distribution.

RISK ASSESSMENT

  • Critical Business Processes:

    • Displaying progress to users in iOS applications to provide feedback and improve user experience. While not a core business process in itself, it is critical for the usability and perceived quality of applications that rely on it. Indirectly, it supports all business processes that rely on smooth user interaction within iOS applications.

  • Data We Are Trying to Protect and Sensitivity:

    • The MBProgressHUD library itself does not directly handle sensitive data. However, applications using the library might be processing sensitive data while displaying progress.
    • Data sensitivity depends entirely on the context of the iOS application using the library. If the application processes Personal Identifiable Information (PII), financial data, or health records, then any vulnerability in the application (including indirectly through a library) could potentially expose this sensitive data.
    • The primary concern is to ensure the library does not introduce vulnerabilities that could be exploited in applications to compromise data confidentiality, integrity, or availability.

QUESTIONS & ASSUMPTIONS

  • Questions:

    • What is the specific context for this threat modeling exercise? Is there a particular application or use case in mind?
    • Are there any known security concerns or past incidents related to UI libraries or progress indicators in iOS applications?
    • What is the organization's risk appetite regarding the use of open-source UI libraries?
    • Are there specific compliance requirements that need to be considered for applications using this library (e.g., GDPR, HIPAA)?

  • Assumptions:

    • Assumption: The primary goal of threat modeling is to identify potential security vulnerabilities in the MBProgressHUD library that could impact applications using it.
    • Assumption: The library is intended for use in a wide range of iOS applications, with varying levels of data sensitivity.
    • Assumption: Security vulnerabilities in the library are primarily a concern if they can be exploited to compromise the security of applications that integrate it.
    • Assumption: The organization using this design document is concerned about the overall security posture of their iOS applications and wants to ensure they are using libraries responsibly and securely.