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BUSINESS POSTURE

Business Priorities and Goals:

  • Provide a library for Android developers to easily incorporate custom fonts and icons into their applications.
  • Offer a wide variety of pre-existing icon fonts, while also allowing developers to easily integrate their own custom fonts.
  • Simplify the process of using icons in Android development, reducing boilerplate code and improving developer productivity.
  • Maintain a lightweight and performant library to minimize impact on application size and performance.
  • Provide comprehensive documentation and support to ensure ease of use and adoption.
  • Foster a community around the library, encouraging contributions and feedback.

Business Risks:

  • Malicious code injection: If the library is compromised, attackers could inject malicious code that could be executed within applications using the library.
  • Supply chain attacks: Compromised dependencies could introduce vulnerabilities into the library.
  • Denial of service: Bugs or vulnerabilities in the library could be exploited to cause application crashes or performance degradation.
  • Data leakage: Although unlikely given the library's function, improper handling of custom fonts could potentially lead to font fingerprinting or other privacy concerns.
  • Intellectual property theft: Custom fonts provided by users could be stolen or misused if not handled securely.
  • Reputational damage: Security vulnerabilities or functional issues could damage the reputation of the library and its maintainers.

SECURITY POSTURE

Existing Security Controls:

  • security control: Code reviews: The project is open-source and subject to community review, which can help identify potential security issues. (Described in GitHub repository)
  • security control: Static analysis: The project may use static analysis tools to identify potential vulnerabilities. (Not explicitly mentioned, but common practice)
  • security control: Dependency management: The project uses Gradle for dependency management, which helps ensure that dependencies are tracked and updated. (Described in build.gradle files)
  • security control: Open source license: The project uses a permissive open-source license (Apache 2.0), which encourages scrutiny and contributions from the security community. (Described in LICENSE file)

Accepted Risks:

  • accepted risk: The library relies on third-party font libraries, which may contain vulnerabilities.
  • accepted risk: The library does not provide explicit mechanisms for protecting custom fonts provided by users.
  • accepted risk: The library does not currently implement specific security hardening measures beyond standard Android development practices.

Recommended Security Controls:

  • security control: Implement a robust Software Bill of Materials (SBOM) management process to track all dependencies and their versions.
  • security control: Integrate Static Application Security Testing (SAST) tools into the build process to automatically scan for vulnerabilities.
  • security control: Perform regular Dynamic Application Security Testing (DAST) to identify runtime vulnerabilities.
  • security control: Consider implementing Content Security Policy (CSP) if the library interacts with web resources.
  • security control: Provide guidelines and best practices for users on securely handling custom fonts.
  • security control: Establish a clear vulnerability disclosure process.
  • security control: Regularly audit the codebase for potential security issues.

Security Requirements:

  • Authentication: Not directly applicable to this library.
  • Authorization: Not directly applicable to this library.
  • Input Validation:
    • The library should validate user-provided font file paths and names to prevent path traversal vulnerabilities.
    • The library should validate font data to prevent buffer overflows or other memory corruption issues.
  • Cryptography: Not directly applicable, unless the library handles encrypted fonts, in which case standard cryptographic best practices should be followed.

DESIGN

C4 CONTEXT

graph LR
    User["Android Developer"] -- Uses --> AndroidIconics["Android Iconics Library"]
    AndroidIconics -- Loads --> FontFiles["Font Files (TTF, OTF)"]
    AndroidIconics -- Uses --> AndroidFramework["Android Framework"]
    AndroidIconics -- Integrated into --> UserApp["User's Android Application"]
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Element Descriptions:

  • Element:

    • Name: Android Developer
    • Type: Person
    • Description: A software developer building Android applications.
    • Responsibilities: Integrates the Android Iconics library into their application, configures icon fonts, and uses the library's API to display icons.
    • Security controls: Follows secure coding practices when integrating the library.

  • Element:

    • Name: Android Iconics Library
    • Type: Software System
    • Description: A library that simplifies the use of custom fonts and icons in Android applications.
    • Responsibilities: Provides an API for loading and displaying icons, manages font resources, and handles rendering.
    • Security controls: Input validation of font file paths and data, dependency management, code reviews.

  • Element:

    • Name: Font Files (TTF, OTF)
    • Type: Data
    • Description: TrueType Font (TTF) or OpenType Font (OTF) files containing icon glyphs.
    • Responsibilities: Store the visual representation of icons.
    • Security controls: None directly within the library's control; relies on the security of the file system and the integrity of the font files themselves.

  • Element:

    • Name: Android Framework
    • Type: Software System
    • Description: The underlying Android operating system and its APIs.
    • Responsibilities: Provides core functionality for rendering text and graphics, managing resources, and interacting with the device.
    • Security controls: Android's built-in security features, such as sandboxing and permission management.

  • Element:

    • Name: User's Android Application
    • Type: Software System
    • Description: The Android application that integrates the Android Iconics library.
    • Responsibilities: Utilizes the library to display icons within its user interface.
    • Security controls: Dependent on the developer's implementation; should follow secure coding practices.

C4 CONTAINER

graph LR
    User["Android Developer"] -- Uses --> API["API"]
    API -- Uses --> FontLoader["Font Loader"]
    API -- Uses --> IconRenderer["Icon Renderer"]
    FontLoader -- Loads --> FontFiles["Font Files (TTF, OTF)"]
    IconRenderer -- Uses --> AndroidFramework["Android Framework (TextView, ImageView)"]
    API -- Integrated into --> UserApp["User's Android Application"]
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Element Descriptions:

  • Element:

    • Name: Android Developer
    • Type: Person
    • Description: A software developer building Android applications.
    • Responsibilities: Integrates the Android Iconics library into their application, configures icon fonts, and uses the library's API to display icons.
    • Security controls: Follows secure coding practices when integrating the library.

  • Element:

    • Name: API
    • Type: API
    • Description: The public interface of the Android Iconics library.
    • Responsibilities: Provides methods for developers to load fonts, create icon drawables, and configure icon appearance.
    • Security controls: Input validation of parameters passed to API methods.

  • Element:

    • Name: Font Loader
    • Type: Component
    • Description: Responsible for loading font files from various sources (assets, resources, external storage).
    • Responsibilities: Reads font data, parses font information, and makes it available to the Icon Renderer.
    • Security controls: Input validation of font file paths, checks for file integrity (if possible).

  • Element:

    • Name: Icon Renderer
    • Type: Component
    • Description: Responsible for rendering icon glyphs into bitmaps or drawables.
    • Responsibilities: Uses the Android Framework's text and graphics APIs to draw icons based on the loaded font data.
    • Security controls: Relies on the security of the Android Framework's rendering mechanisms.

  • Element:

    • Name: Font Files (TTF, OTF)
    • Type: Data
    • Description: TrueType Font (TTF) or OpenType Font (OTF) files containing icon glyphs.
    • Responsibilities: Store the visual representation of icons.
    • Security controls: None directly within the library's control; relies on the security of the file system and the integrity of the font files themselves.

  • Element:

    • Name: Android Framework (TextView, ImageView)
    • Type: Software System
    • Description: Components of the Android Framework used for displaying text and images.
    • Responsibilities: Render the icon drawables created by the Icon Renderer.
    • Security controls: Android's built-in security features.

  • Element:

    • Name: User's Android Application
    • Type: Software System
    • Description: The Android application that integrates the Android Iconics library.
    • Responsibilities: Utilizes the library to display icons within its user interface.
    • Security controls: Dependent on the developer's implementation; should follow secure coding practices.

DEPLOYMENT

Possible Deployment Solutions:

  1. Local Library Project: The library is included as a local module within the application project.
  2. Maven Central/JitPack: The library is published to a repository like Maven Central or JitPack and included as a dependency in the application's build.gradle file.
  3. Manual AAR Import: The library is compiled into an AAR file and manually imported into the application project.

Chosen Solution (Maven Central/JitPack):

graph LR
    DevMachine["Developer Machine"] -- "./gradlew publish" --> MavenRepo["Maven Central / JitPack"]
    MavenRepo -- Dependency Resolution --> AppProject["Application Project (build.gradle)"]
    AppProject -- Build --> APK["Android Application Package (APK)"]
    APK -- Install --> AndroidDevice["Android Device"]
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Element Descriptions:

  • Element:

    • Name: Developer Machine
    • Type: Infrastructure Node
    • Description: The developer's workstation where the library code is developed and built.
    • Responsibilities: Hosts the source code, build tools, and publishing scripts.
    • Security controls: Standard development environment security practices (e.g., secure coding, access control).

  • Element:

    • Name: Maven Central / JitPack
    • Type: Infrastructure Node
    • Description: A public repository for hosting Java and Android libraries.
    • Responsibilities: Stores and distributes the compiled Android Iconics library.
    • Security controls: Repository-specific security measures (e.g., access control, integrity checks).

  • Element:

    • Name: Application Project (build.gradle)
    • Type: Software System
    • Description: The Android application project that depends on the Android Iconics library.
    • Responsibilities: Declares the library as a dependency in its build.gradle file.
    • Security controls: Dependency management, secure coding practices.

  • Element:

    • Name: Android Application Package (APK)
    • Type: Data
    • Description: The final packaged application file that is installed on Android devices.
    • Responsibilities: Contains the compiled application code, resources, and the Android Iconics library.
    • Security controls: Android's application signing and verification mechanisms.

  • Element:

    • Name: Android Device
    • Type: Device
    • Description: The end-user's Android device where the application is installed.
    • Responsibilities: Runs the application, including the Android Iconics library.
    • Security controls: Android's built-in security features.

BUILD

graph LR
    Developer["Developer"] -- Commits code --> GitRepo["Git Repository (GitHub)"]
    GitRepo -- Webhook Trigger --> CI["CI Server (GitHub Actions)"]
    CI -- Runs build script --> Build["Build Process (Gradle)"]
    Build -- Dependency Resolution --> Maven["Maven Central / JitPack"]
    Build -- Performs --> SAST["SAST (Static Analysis)"]
    Build -- Performs --> Lint["Linting (Android Lint)"]
    Build -- Generates --> AAR["AAR Library File"]
    AAR -- Uploaded to --> ArtifactRepo["Artifact Repository (GitHub Releases / Maven)"]
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Build Process Description:

  1. Code Commit: A developer commits code changes to the Git repository (GitHub).
  2. CI Trigger: A webhook triggers the CI server (GitHub Actions) upon code commit.
  3. Build Execution: The CI server runs the build script (Gradle).
  4. Dependency Resolution: Gradle resolves dependencies from Maven Central/JitPack.
  5. Static Analysis: SAST tools (e.g., FindBugs, PMD, Checkstyle) are executed to analyze the code for potential vulnerabilities.
  6. Linting: Android Lint is used to identify potential code quality and style issues.
  7. AAR Generation: Gradle compiles the library code and generates the AAR (Android Archive) file.
  8. Artifact Upload: The AAR file is uploaded to an artifact repository (GitHub Releases or Maven Central/JitPack).

Security Controls:

  • security control: Dependency Management: Gradle manages dependencies, ensuring that specific versions are used and tracked.
  • security control: SAST: Static analysis tools are integrated into the build process to identify potential vulnerabilities before deployment.
  • security control: Linting: Android Lint helps enforce coding standards and identify potential issues that could lead to security vulnerabilities.
  • security control: CI/CD: The use of a CI server (GitHub Actions) automates the build and testing process, ensuring consistency and reducing the risk of manual errors.
  • security control: Signed Releases: Releases should be digitally signed to ensure their integrity and authenticity.

RISK ASSESSMENT

Critical Business Processes:

  • Providing a reliable and functional library for Android developers.
  • Maintaining the reputation and trust of the library and its maintainers.

Data Protection:

  • Font Files (TTF, OTF): While the library itself doesn't store sensitive data, it handles font files provided by users. The sensitivity of these files depends on the user's content. If a user provides a custom font containing sensitive information (e.g., a proprietary font used for branding), that information could be exposed if the font file is not handled securely. Sensitivity: Low to Medium (depending on user-provided content).
  • Library Code: The library's source code itself is not considered sensitive data, as it is publicly available. However, vulnerabilities in the code could be exploited to compromise applications using the library. Sensitivity: Low (source code), High (vulnerabilities).
  • No other user data is handled by the library.

QUESTIONS & ASSUMPTIONS

Questions:

  • Are there any specific performance requirements or limitations for the library?
  • Are there any plans to support other platforms besides Android in the future?
  • What is the expected frequency of updates and releases?
  • What level of support is provided to users of the library?
  • Are there any specific legal or compliance requirements that the library needs to adhere to?
  • Are there any plans for monetization of the library?

Assumptions:

  • BUSINESS POSTURE: The primary goal is to provide a free and open-source library for the Android developer community.
  • BUSINESS POSTURE: The project maintainers have a moderate risk appetite, prioritizing functionality and ease of use while still taking reasonable security precautions.
  • SECURITY POSTURE: The project follows standard Android development practices and security best practices.
  • SECURITY POSTURE: The project relies on community contributions and code reviews for security auditing.
  • SECURITY POSTURE: The project uses Gradle for dependency management.
  • DESIGN: The library is primarily used by integrating it into Android applications via Maven Central or JitPack.
  • DESIGN: The library's core functionality is to load and render icons from font files.
  • DESIGN: The library relies on the Android Framework for rendering and resource management.
  • DESIGN: The build process is automated using GitHub Actions and Gradle.