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BUSINESS POSTURE

This project, fscalendar, provides a customizable calendar component for iOS applications.

  • Business priorities:

    • Provide a reusable and visually appealing calendar component for iOS developers.
    • Offer a flexible and feature-rich calendar solution that can be easily integrated into various iOS projects.
    • Maintain a high-quality, well-documented, and actively supported component to ensure developer satisfaction.

  • Business goals:

    • Increase developer productivity by offering a ready-to-use calendar component, saving development time and effort.
    • Enhance the user experience of iOS applications by providing a polished and intuitive calendar interface.
    • Establish fscalendar as a popular and trusted calendar component within the iOS development community.

  • Business risks:

    • Component defects leading to incorrect date or time handling in applications, potentially causing data corruption or functional errors.
    • Security vulnerabilities within the component that could be exploited by malicious actors in applications using fscalendar.
    • Performance issues within the component that could negatively impact the responsiveness and user experience of applications.
    • Lack of updates or maintenance, leading to incompatibility with newer iOS versions or unresolved bugs, diminishing developer trust and adoption.

SECURITY POSTURE

  • Security control: Code is publicly available on GitHub, allowing for community review and scrutiny. Implemented: GitHub repository.

  • Accepted risk: As an open-source project, formal security audits and penetration testing are unlikely to be performed regularly.

  • Accepted risk: Vulnerabilities might be discovered and disclosed by the community, potentially after exploitation in applications using the component.

  • Recommended security controls:

    • Security control: Implement automated static code analysis (SAST) tools in the development workflow to identify potential security vulnerabilities in the code.
    • Security control: Conduct regular manual code reviews, focusing on security best practices and common vulnerability patterns.
    • Security control: Implement dependency scanning to identify and address vulnerabilities in any third-party libraries or dependencies used by the component.
    • Security control: Establish a process for reporting and addressing security vulnerabilities discovered by the community or through internal testing.

  • Security requirements:

    • Authentication: Not directly applicable to a UI component. Authentication is expected to be handled by the application integrating fscalendar.
    • Authorization: Not directly applicable to a UI component. Authorization is expected to be handled by the application integrating fscalendar.
    • Input validation: The component should validate all inputs, such as dates, times, and user interactions, to prevent unexpected behavior or crashes. This is especially important when handling user-provided data to configure or interact with the calendar.
    • Cryptography: Cryptography is not expected to be a core requirement for this UI component. If the component were to handle or store sensitive date-related data (which is not the primary purpose), appropriate encryption measures would be necessary. For now, cryptography is not considered a primary security requirement.

DESIGN

C4 CONTEXT

flowchart LR
    subgraph "iOS User"
        U(["User of iOS App"])
    end
    subgraph "iOS Developer"
        D(["Developer using fscalendar"])
    end
    subgraph "fscalendar Project"
        F(["fscalendar Component"])
    end
    subgraph "iOS Ecosystem"
        IOS(["iOS Platform"])
        Xcode(["Xcode IDE"])
        SPM(["Swift Package Manager"])
        CocoaPods(["CocoaPods"])
        Carthage(["Carthage"])
    end

    U --> F
    D --> F
    D --> Xcode
    F --> IOS
    F --> SPM
    F --> CocoaPods
    F --> Carthage
    Xcode --> IOS

    linkStyle 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14 fill:transparent,stroke:black,stroke-width:1px;
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  • Context Diagram Elements:
    • Element:
      • Name: User of iOS App
      • Type: Person
      • Description: End-users who interact with iOS applications that incorporate the fscalendar component.
      • Responsibilities: Interacting with the calendar UI to select dates, view events (if integrated), and manage their schedule within the iOS application.
      • Security controls: Security controls are managed by the iOS application itself and the underlying iOS platform. fscalendar should not introduce vulnerabilities that could compromise user security.
    • Element:
      • Name: Developer using fscalendar
      • Type: Person
      • Description: iOS software developers who integrate the fscalendar component into their iOS applications.
      • Responsibilities: Integrating the fscalendar component into their projects, configuring it to meet their application's needs, and ensuring proper functionality and security within their application.
      • Security controls: Developers are responsible for using fscalendar securely within their applications and following secure coding practices.
    • Element:
      • Name: fscalendar Component
      • Type: Software System
      • Description: The fscalendar iOS calendar component, providing UI elements and logic for displaying and interacting with calendars.
      • Responsibilities: Providing a customizable and functional calendar UI, handling date calculations and display, and offering an API for developers to integrate calendar functionality into their applications.
      • Security controls: Input validation, secure coding practices during development, and adherence to iOS security guidelines.
    • Element:
      • Name: iOS Platform
      • Type: Software System
      • Description: Apple's iOS operating system, providing the runtime environment for iOS applications and the fscalendar component.
      • Responsibilities: Providing a secure and stable platform for applications, managing system resources, and enforcing security policies.
      • Security controls: Operating system level security controls, sandboxing, code signing, and regular security updates.
    • Element:
      • Name: Xcode IDE
      • Type: Software System
      • Description: Apple's Integrated Development Environment (IDE) used by iOS developers to build and develop iOS applications, including those using fscalendar.
      • Responsibilities: Providing tools for code editing, building, debugging, and deploying iOS applications.
      • Security controls: Code signing, developer certificates, and integration with Apple's security infrastructure.
    • Element:
      • Name: Swift Package Manager
      • Type: Software System
      • Description: Apple's dependency management tool for Swift projects, used to integrate fscalendar into iOS applications.
      • Responsibilities: Managing project dependencies, downloading and linking libraries, and ensuring dependency integrity.
      • Security controls: Dependency verification, checksums, and secure package distribution.
    • Element:
      • Name: CocoaPods
      • Type: Software System
      • Description: A popular dependency manager for Swift and Objective-C projects, used to integrate fscalendar into iOS applications.
      • Responsibilities: Managing project dependencies, downloading and linking libraries, and ensuring dependency integrity.
      • Security controls: Podspec verification, source code review of pods, and community vetting.
    • Element:
      • Name: Carthage
      • Type: Software System
      • Description: A decentralized dependency manager for Swift and Objective-C projects, used to integrate fscalendar into iOS applications.
      • Responsibilities: Managing project dependencies, building frameworks from source code, and allowing for more control over dependency integration.
      • Security controls: Dependency source code review, build process control, and decentralized nature reducing single points of failure.

C4 CONTAINER

flowchart LR
    subgraph "iOS Application"
        subgraph "fscalendar Container"
            F(["fscalendar Library (Swift)"])
        end
        AppCode(["Application Code (Swift/Objective-C)"])
    end
    IOS(["iOS Platform"])

    AppCode --> F
    F --> IOS

    linkStyle 0,1,2 fill:transparent,stroke:black,stroke-width:1px;
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  • Container Diagram Elements:
    • Element:
      • Name: fscalendar Library (Swift)
      • Type: Library
      • Description: The fscalendar component implemented as a Swift library, containing the code for calendar UI rendering, date calculations, and user interaction handling.
      • Responsibilities: Providing calendar UI elements, managing date and time logic, handling user input related to calendar interactions, and exposing an API for application developers to customize and integrate the calendar.
      • Security controls: Input validation within the library to handle various date formats and user inputs, secure coding practices in Swift, and adherence to iOS security guidelines.
    • Element:
      • Name: Application Code (Swift/Objective-C)
      • Type: Application Code
      • Description: The custom Swift or Objective-C code written by iOS developers to build their specific iOS application, which integrates and utilizes the fscalendar library.
      • Responsibilities: Integrating the fscalendar library into the application, configuring the calendar component, handling application-specific logic related to dates and calendar events, and managing user authentication and authorization within the application.
      • Security controls: Secure coding practices in application code, proper handling of user data, implementation of authentication and authorization mechanisms, and secure communication with backend services if applicable.
    • Element:
      • Name: iOS Platform
      • Type: Operating System
      • Description: Apple's iOS operating system, providing the runtime environment for the iOS application and the fscalendar library.
      • Responsibilities: Providing a secure and stable platform for applications, managing system resources, enforcing security policies, and providing system-level security features.
      • Security controls: Operating system level security controls, sandboxing, code signing, app store review process, and regular security updates.

DEPLOYMENT

flowchart LR
    subgraph "iOS Device"
        subgraph "Operating System"
            IOS(["iOS"])
            subgraph "Application Sandbox"
                App(["iOS Application with fscalendar"])
            end
        end
    end
    AppStore(["App Store"])
    TestFlight(["TestFlight"])

    AppStore -.-> App
    TestFlight -.-> App
    App --> IOS
    IOS --> "iOS Device Hardware"

    linkStyle 0,1,2,3,4 fill:transparent,stroke:black,stroke-width:1px;
    linkStyle 0,1  stroke-dasharray: 5 5
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  • Deployment Diagram Elements:
    • Element:
      • Name: iOS Device
      • Type: Physical Device
      • Description: An iPhone or iPad device running the iOS operating system, on which the iOS application incorporating fscalendar is deployed and used by end-users.
      • Responsibilities: Providing the physical hardware and environment for running the iOS application.
      • Security controls: Device passcode/biometrics, device encryption, and user control over app permissions.
    • Element:
      • Name: iOS
      • Type: Operating System
      • Description: Apple's iOS operating system running on the iOS device, providing the runtime environment and security features for applications.
      • Responsibilities: Managing system resources, enforcing security policies, providing the application sandbox, and handling app installations and updates.
      • Security controls: Operating system level security controls, kernel integrity protection, sandboxing, code signing enforcement, and regular security updates.
    • Element:
      • Name: Application Sandbox
      • Type: Software Environment
      • Description: A restricted environment within iOS where each application runs, limiting its access to system resources and other applications' data, enhancing security and privacy.
      • Responsibilities: Isolating applications from each other and the system, restricting access to sensitive resources, and enforcing security permissions.
      • Security controls: Process isolation, file system restrictions, network access controls, and permission-based access to device features.
    • Element:
      • Name: iOS Application with fscalendar
      • Type: Software Application
      • Description: The iOS application developed by a developer, which includes the integrated fscalendar component and is deployed on the user's iOS device.
      • Responsibilities: Providing the application's functionality to the user, utilizing the fscalendar component for calendar-related features, and managing application-specific data and security.
      • Security controls: Application-level security controls, secure coding practices, input validation, data protection measures, and adherence to iOS security guidelines.
    • Element:
      • Name: App Store
      • Type: Distribution Platform
      • Description: Apple's official app distribution platform, used to distribute and install iOS applications to end-users.
      • Responsibilities: Reviewing applications for security and policy compliance before distribution, providing a trusted source for app downloads, and managing app updates.
      • Security controls: App review process, code signing requirements, and platform security measures to prevent malware distribution.
    • Element:
      • Name: TestFlight
      • Type: Distribution Platform
      • Description: Apple's platform for beta testing iOS applications before public release, allowing developers to distribute pre-release versions of their apps to testers.
      • Responsibilities: Facilitating beta testing of applications, providing a controlled environment for pre-release distribution, and gathering feedback from testers.
      • Security controls: Limited distribution to invited testers, code signing requirements, and platform security measures.

BUILD

flowchart LR
    subgraph "Developer Workstation"
        Developer(["Developer"])
        CodeEditor(["Code Editor (Xcode)"])
        SourceCode(["fscalendar Source Code"])
    end
    subgraph "Build System (Local/CI)"
        BuildScript(["Build Script (Swift Package Manager/Xcodebuild)"])
        Compiler(["Swift Compiler"])
        StaticAnalysis(["Static Analysis Tools (SAST)"])
        DependencyCheck(["Dependency Check"])
        BuildArtifacts(["fscalendar Library Artifacts"])
    end
    subgraph "Distribution"
        SPMRegistry(["Swift Package Manager Registry (e.g., GitHub Releases)"])
        CocoaPodsRegistry(["CocoaPods Registry"])
        CarthageRegistry(["Carthage Registry (e.g., GitHub Releases)"])
    end

    Developer --> CodeEditor
    CodeEditor --> SourceCode
    SourceCode --> BuildScript
    BuildScript --> Compiler
    Compiler --> StaticAnalysis
    Compiler --> DependencyCheck
    StaticAnalysis --> BuildSystem
    DependencyCheck --> BuildSystem
    BuildScript --> BuildArtifacts
    BuildArtifacts --> SPMRegistry
    BuildArtifacts --> CocoaPodsRegistry
    BuildArtifacts --> CarthageRegistry

    style BuildSystem fill:#f9f,stroke:#333,stroke-width:2px
    linkStyle 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14 fill:transparent,stroke:black,stroke-width:1px;
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  • Build Process Elements:
    • Element:
      • Name: Developer
      • Type: Person
      • Description: A software developer working on the fscalendar project, writing code, and initiating the build process.
      • Responsibilities: Writing and maintaining the fscalendar source code, initiating builds, and addressing build failures or security findings.
      • Security controls: Secure workstation, access control to source code repository, and code review participation.
    • Element:
      • Name: Code Editor (Xcode)
      • Type: Tool
      • Description: Xcode IDE used by developers to write and edit the fscalendar source code.
      • Responsibilities: Providing a development environment for writing and managing code.
      • Security controls: Code editor security features, plugins from trusted sources only.
    • Element:
      • Name: fscalendar Source Code
      • Type: Data
      • Description: The Swift source code of the fscalendar component, stored in a version control system (e.g., Git on GitHub).
      • Responsibilities: Representing the codebase of the project, tracked for changes and collaboration.
      • Security controls: Access control to the repository, branch protection, and version history.
    • Element:
      • Name: Build Script (Swift Package Manager/Xcodebuild)
      • Type: Script
      • Description: Scripts used to automate the build process, potentially using Swift Package Manager commands or Xcodebuild.
      • Responsibilities: Automating compilation, testing, and packaging of the fscalendar library.
      • Security controls: Securely stored and managed build scripts, review of script contents for malicious commands.
    • Element:
      • Name: Swift Compiler
      • Type: Tool
      • Description: Apple's Swift compiler, used to compile the Swift source code into executable code or library artifacts.
      • Responsibilities: Compiling Swift code into machine code.
      • Security controls: Compiler from trusted source (Xcode), compiler security features.
    • Element:
      • Name: Static Analysis Tools (SAST)
      • Type: Tool
      • Description: Static Application Security Testing tools used to automatically scan the source code for potential security vulnerabilities.
      • Responsibilities: Identifying potential security flaws in the code before runtime.
      • Security controls: Regularly updated SAST tools, configured with relevant security rules.
    • Element:
      • Name: Dependency Check
      • Type: Tool
      • Description: Tools used to check for known vulnerabilities in third-party dependencies used by the fscalendar project.
      • Responsibilities: Identifying vulnerable dependencies to mitigate supply chain risks.
      • Security controls: Regularly updated dependency vulnerability databases, automated dependency checking.
    • Element:
      • Name: Build Artifacts
      • Type: Data
      • Description: The compiled fscalendar library files (e.g., .swiftmodule, .swiftdoc, .framework) produced by the build process.
      • Responsibilities: Representing the distributable component of fscalendar.
      • Security controls: Secure storage of build artifacts, signing of artifacts if applicable.
    • Element:
      • Name: Swift Package Manager Registry (e.g., GitHub Releases)
      • Type: Registry
      • Description: A registry or distribution point for Swift Packages, potentially using GitHub Releases to host fscalendar releases.
      • Responsibilities: Hosting and distributing fscalendar releases for developers to use via Swift Package Manager.
      • Security controls: Secure registry platform, integrity checks for packages, and version control.
    • Element:
      • Name: CocoaPods Registry
      • Type: Registry
      • Description: The CocoaPods central repository, where fscalendar might be published as a pod for dependency management.
      • Responsibilities: Hosting and distributing fscalendar as a CocoaPod for developers.
      • Security controls: CocoaPods registry security measures, podspec verification process.
    • Element:
      • Name: Carthage Registry (e.g., GitHub Releases)
      • Type: Registry
      • Description: Distribution point for Carthage compatible frameworks, potentially using GitHub Releases to host fscalendar releases.
      • Responsibilities: Hosting and distributing fscalendar releases for developers to use via Carthage.
      • Security controls: Secure registry platform, integrity checks for frameworks, and version control.

RISK ASSESSMENT

  • Critical business process: Ensuring correct and reliable calendar functionality within iOS applications that use fscalendar. Incorrect date handling or component malfunction could lead to data errors, scheduling conflicts, or user dissatisfaction in applications relying on accurate calendar information.

  • Data to protect:

    • Source code of fscalendar: Sensitivity: Medium. Confidentiality and integrity of the source code are important to prevent unauthorized modifications or exposure of potential vulnerabilities.
    • Build artifacts (compiled library): Sensitivity: Low to Medium. Integrity of build artifacts is important to ensure that developers are using a safe and unmodified version of the component.
    • User data handled by applications using fscalendar: Sensitivity: Varies depending on the application. fscalendar itself is a UI component and ideally should not handle sensitive user data directly. However, applications integrating fscalendar might display or process sensitive date-related information. The security of this data is primarily the responsibility of the integrating application, but fscalendar should not introduce vulnerabilities that could compromise it.

QUESTIONS & ASSUMPTIONS

  • Questions:

    • Is fscalendar intended to handle any user-sensitive data directly, or is it purely a UI component for date selection and display?
    • Are there specific performance requirements for fscalendar, especially in resource-constrained iOS environments?
    • What is the intended support and maintenance model for fscalendar? Will there be regular updates and security patches?
    • Are there any specific compliance requirements (e.g., accessibility, data privacy) that fscalendar needs to adhere to?

  • Assumptions:

    • BUSINESS POSTURE: The primary business goal is to provide a useful and reliable calendar component for iOS developers to enhance their applications. The project is community-driven and aims for wide adoption within the iOS development community.
    • SECURITY POSTURE: Security is important but not the absolute top priority for this open-source UI component compared to projects handling sensitive backend data. Basic security best practices and community scrutiny are the main security controls currently in place.
    • DESIGN: fscalendar is designed as a UI library to be integrated into iOS applications. It focuses on providing calendar UI functionality and relies on the integrating application for data handling, business logic, and security context. Deployment is primarily through dependency managers like Swift Package Manager, CocoaPods, and Carthage, and ultimately deployed as part of iOS applications distributed via the App Store or TestFlight.