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BUSINESS POSTURE

Business Priorities and Goals:

  • Provide a modern, efficient, and customizable JSON library for Java and Kotlin.
  • Offer a simpler, more robust alternative to existing JSON libraries like Gson.
  • Improve developer productivity by reducing boilerplate code related to JSON serialization and deserialization.
  • Enhance performance and reduce memory footprint compared to other JSON libraries.
  • Support advanced features like polymorphism, custom adapters, and streaming.
  • Maintain strong compatibility with Kotlin's features, including null safety and data classes.
  • Ensure the library is easy to use, well-documented, and actively maintained.

Business Risks:

  • Incompatibility with existing projects or libraries that rely on different JSON processing mechanisms.
  • Performance bottlenecks or excessive memory usage when handling large or complex JSON data.
  • Security vulnerabilities arising from improper handling of untrusted JSON input.
  • Difficulty in adapting the library to evolving JSON standards or specific application requirements.
  • Lack of community adoption or contribution, leading to stagnation or obsolescence.
  • Bugs or unexpected behavior that could lead to data corruption or application instability.

SECURITY POSTURE

Existing Security Controls:

  • security control: The project uses GitHub, which provides a secure platform for code hosting, version control, and collaboration.
  • security control: The project is open-source, allowing for community review and scrutiny of the codebase.
  • security control: Moshi focuses on secure defaults, such as strict parsing, to mitigate common JSON vulnerabilities.
  • security control: The library is designed to handle various edge cases and malformed JSON input gracefully. (implied, needs verification)
  • security control: The project likely has unit and integration tests to ensure the correctness and security of the code. (implied, needs verification)

Accepted Risks:

  • accepted risk: The library relies on external dependencies, which could introduce vulnerabilities if not properly managed.
  • accepted risk: Users may misuse the library or introduce vulnerabilities in their own code that interacts with Moshi.
  • accepted risk: The library may not be fully compliant with all relevant security standards or regulations. (needs verification)

Recommended Security Controls:

  • security control: Implement regular dependency updates and vulnerability scanning to mitigate supply chain risks.
  • security control: Provide clear security documentation and guidelines for users on how to use the library securely.
  • security control: Conduct regular security audits and penetration testing to identify and address potential vulnerabilities.
  • security control: Implement a security policy and vulnerability disclosure program.
  • security control: Consider using static analysis tools (SAST) to identify potential security issues during development.
  • security control: Consider using dynamic analysis tools (DAST) to test the library's runtime behavior and identify vulnerabilities.

Security Requirements:

  • Authentication: Not directly applicable to a JSON library.
  • Authorization: Not directly applicable to a JSON library.
  • Input Validation:
    • The library should strictly validate JSON input against the expected schema.
    • The library should handle malformed or unexpected JSON input gracefully, without crashing or exposing sensitive information.
    • The library should provide mechanisms for users to customize validation rules and error handling.
  • Cryptography:
    • Not directly applicable to a JSON library, unless it's used for handling encrypted data. If so, it should use well-established cryptographic libraries and algorithms.
  • Data Protection:
    • The library should not store or transmit sensitive data unnecessarily.
    • If the library handles sensitive data, it should be protected in accordance with relevant security standards and regulations.

DESIGN

C4 CONTEXT

graph LR
    User["User/Application"] -- "Uses" --> Moshi["Moshi Library"]
    Moshi -- "Uses" --> Kotlin["Kotlin Standard Library"]
    Moshi -- "Uses" --> Okio["Okio Library"]
    Moshi -- "Uses" --> Java["Java Standard Library"]
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Element Descriptions:

  • User/Application:
    • Name: User/Application
    • Type: External Entity
    • Description: Represents the application or user that utilizes the Moshi library for JSON serialization and deserialization.
    • Responsibilities: Provides data to be serialized to JSON, consumes data deserialized from JSON, configures Moshi instances and adapters.
    • Security controls: Input validation of data before serialization, secure handling of deserialized data.
  • Moshi Library:
    • Name: Moshi Library
    • Type: System
    • Description: The core Moshi library, providing JSON processing capabilities.
    • Responsibilities: Serializing Java/Kotlin objects to JSON, deserializing JSON to Java/Kotlin objects, providing adapter mechanisms for custom data types, handling JSON parsing and formatting.
    • Security controls: Strict JSON parsing, input validation, secure defaults.
  • Kotlin Standard Library:
    • Name: Kotlin Standard Library
    • Type: External Dependency
    • Description: The standard library for the Kotlin programming language.
    • Responsibilities: Provides core functionalities for Kotlin, including collections, coroutines, and other utilities.
    • Security controls: Relies on the security of the Kotlin runtime and standard library implementation.
  • Okio Library:
    • Name: Okio Library
    • Type: External Dependency
    • Description: A library that complements java.io and java.nio to make it easier to access, store, and process data.
    • Responsibilities: Provides efficient I/O operations, including buffered streams and byte manipulation.
    • Security controls: Relies on the security of the Okio library implementation.
  • Java Standard Library:
    • Name: Java Standard Library
    • Type: External Dependency
    • Description: The standard library for the Java programming language.
    • Responsibilities: Provides core functionalities for Java, including I/O, collections, and other utilities.
    • Security controls: Relies on the security of the Java runtime and standard library implementation.

C4 CONTAINER

graph LR
    User["User/Application"] -- "Uses" --> MoshiAPI["Moshi API"]
    MoshiAPI -- "Uses" --> JsonAdapters["JSON Adapters"]
    MoshiAPI -- "Uses" --> Reflection["Reflection (Optional)"]
    JsonAdapters -- "Uses" --> CustomAdapters["Custom Adapters (Optional)"]
    JsonAdapters -- "Uses" --> BuiltInAdapters["Built-in Adapters"]
    BuiltInAdapters -- "Uses" --> Okio["Okio"]
    BuiltInAdapters -- "Uses" --> Kotlin["Kotlin Stdlib"]
    BuiltInAdapters -- "Uses" --> Java["Java Stdlib"]
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Element Descriptions:

  • User/Application:
    • Name: User/Application
    • Type: External Entity
    • Description: Represents the application or user that utilizes the Moshi library.
    • Responsibilities: Provides data, consumes data, configures Moshi.
    • Security controls: Input validation, secure handling of data.
  • Moshi API:
    • Name: Moshi API
    • Type: Container
    • Description: The public API of the Moshi library, providing access to its functionalities.
    • Responsibilities: Exposes methods for creating Moshi instances, configuring adapters, and performing serialization/deserialization.
    • Security controls: API design should follow secure coding principles.
  • JSON Adapters:
    • Name: JSON Adapters
    • Type: Container
    • Description: The core component for converting between Java/Kotlin objects and JSON.
    • Responsibilities: Handles the logic for serializing and deserializing different data types.
    • Security controls: Input validation, type checking, secure handling of data.
  • Reflection (Optional):
    • Name: Reflection (Optional)
    • Type: Container
    • Description: Used for reflection-based serialization and deserialization.
    • Responsibilities: Dynamically accesses class information and fields.
    • Security controls: Should be used carefully to avoid security vulnerabilities related to reflection.
  • Custom Adapters (Optional):
    • Name: Custom Adapters (Optional)
    • Type: Container
    • Description: User-defined adapters for handling custom data types.
    • Responsibilities: Implements the logic for serializing and deserializing specific data types.
    • Security controls: Relies on the security of the user-provided implementation.
  • Built-in Adapters:
    • Name: Built-in Adapters
    • Type: Container
    • Description: Provides adapters for common data types like primitives, collections, and dates.
    • Responsibilities: Handles the serialization and deserialization of built-in types.
    • Security controls: Implemented with secure coding practices.
  • Okio:
    • Name: Okio
    • Type: External Dependency
    • Description: Library for efficient I/O operations.
    • Responsibilities: Provides buffered streams and byte manipulation.
    • Security controls: Relies on the security of the Okio library.
  • Kotlin Stdlib:
    • Name: Kotlin Stdlib
    • Type: External Dependency
    • Description: Kotlin Standard Library.
    • Responsibilities: Core Kotlin functionalities.
    • Security controls: Relies on Kotlin runtime security.
  • Java Stdlib:
    • Name: Java Stdlib
    • Type: External Dependency
    • Description: Java Standard Library.
    • Responsibilities: Core Java functionalities.
    • Security controls: Relies on Java runtime security.

DEPLOYMENT

Possible Deployment Solutions:

  1. Embedded Library: Moshi is typically used as a library embedded within another application. The application is then deployed according to its specific requirements (e.g., as a web application, a desktop application, a mobile app, etc.).
  2. Standalone Service (Less Common): While less common, Moshi could theoretically be used as part of a standalone service that provides JSON processing capabilities. This service could be deployed as a containerized application (e.g., using Docker) or as a serverless function.

Chosen Deployment Solution (Embedded Library):

graph LR
    ApplicationServer["Application Server (e.g., Tomcat, Jetty)"] -- "Hosts" --> WebApplication["Web Application"]
    WebApplication -- "Includes" --> Moshi["Moshi Library (JAR)"]
    WebApplication -- "Includes" --> OtherDependencies["Other Dependencies (JARs)"]
    User["User"] -- "Interacts with" --> ApplicationServer
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Element Descriptions:

  • Application Server:
    • Name: Application Server (e.g., Tomcat, Jetty)
    • Type: Infrastructure Node
    • Description: The server environment that hosts the web application.
    • Responsibilities: Provides the runtime environment for the application, handles HTTP requests and responses.
    • Security controls: Server hardening, firewall configuration, regular security updates.
  • Web Application:
    • Name: Web Application
    • Type: Software System
    • Description: The application that utilizes the Moshi library.
    • Responsibilities: Provides the application's core functionality.
    • Security controls: Application-level security controls, input validation, output encoding, authentication, authorization.
  • Moshi Library (JAR):
    • Name: Moshi Library (JAR)
    • Type: Library
    • Description: The Moshi library packaged as a JAR file.
    • Responsibilities: Provides JSON serialization and deserialization.
    • Security controls: Secure coding practices within the library, dependency management.
  • Other Dependencies (JARs):
    • Name: Other Dependencies (JARs)
    • Type: Library
    • Description: Other libraries required by the web application.
    • Responsibilities: Provides various functionalities to the application.
    • Security controls: Dependency management, vulnerability scanning.
  • User:
    • Name: User
    • Type: External Entity
    • Description: The user interacting with the web application.
    • Responsibilities: Sends requests to the application, receives responses.
    • Security controls: Browser security settings, secure communication protocols (HTTPS).

BUILD

graph LR
    Developer["Developer"] -- "Commits code" --> GitRepository["Git Repository (GitHub)"]
    GitRepository -- "Triggers" --> CI["CI Server (GitHub Actions)"]
    CI -- "Runs" --> BuildScript["Build Script (Gradle)"]
    BuildScript -- "Downloads" --> Dependencies["Dependencies (Maven Central)"]
    BuildScript -- "Performs" --> Tests["Unit & Integration Tests"]
    BuildScript -- "Performs" --> SAST["Static Analysis (SAST)"]
    BuildScript -- "Performs" --> SCA["Software Composition Analysis (SCA)"]
    BuildScript -- "Produces" --> Artifact["Artifact (JAR)"]
    Artifact -- "Published to" --> ArtifactRepository["Artifact Repository (Maven Central)"]
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Build Process Description:

  1. Code Commit: A developer commits code changes to the Git repository hosted on GitHub.
  2. CI Trigger: The commit triggers a build on the CI server (GitHub Actions).
  3. Build Script Execution: The CI server executes the build script (Gradle).
  4. Dependency Download: The build script downloads dependencies from Maven Central.
  5. Testing: The build script runs unit and integration tests.
  6. Static Analysis (SAST): A SAST tool (e.g., SpotBugs, PMD) analyzes the code for potential security vulnerabilities.
  7. Software Composition Analysis (SCA): An SCA tool (e.g., OWASP Dependency-Check) analyzes the project's dependencies for known vulnerabilities.
  8. Artifact Creation: The build script produces the Moshi library artifact (JAR file).
  9. Artifact Publication: The artifact is published to an artifact repository (Maven Central).

Security Controls:

  • security control: Use of a secure code repository (GitHub).
  • security control: Automated build process using a CI server (GitHub Actions).
  • security control: Dependency management using Gradle and Maven Central.
  • security control: Unit and integration testing to ensure code quality and security.
  • security control: Static analysis (SAST) to identify potential code vulnerabilities.
  • security control: Software Composition Analysis (SCA) to identify vulnerabilities in dependencies.
  • security control: Secure artifact repository (Maven Central).

RISK ASSESSMENT

Critical Business Processes:

  • JSON serialization and deserialization for data exchange between applications and services.
  • Data binding for mapping JSON data to Java/Kotlin objects.
  • Configuration and customization of JSON processing.

Data to Protect:

  • Any data serialized or deserialized using Moshi. The sensitivity of this data depends entirely on the application using Moshi. Moshi itself doesn't inherently handle sensitive data, but it processes data that could be sensitive.
  • Configuration data for Moshi (if any). This is generally not sensitive.

Data Sensitivity:

  • Variable: The sensitivity of the data processed by Moshi is entirely dependent on the context of the application using it. It could range from non-sensitive public data to highly sensitive PII, financial data, or healthcare information.

QUESTIONS & ASSUMPTIONS

Questions:

  • What specific types of data will be processed by Moshi in the applications where it is used?
  • Are there any specific security standards or regulations that the applications using Moshi must comply with (e.g., GDPR, HIPAA, PCI DSS)?
  • What is the threat model for the applications using Moshi? What are the potential attackers and their motivations?
  • Are there any existing security reviews or audits of the Moshi library?
  • What is the process for reporting and addressing security vulnerabilities in Moshi?
  • Are there any performance requirements or limitations for Moshi?
  • What level of logging and monitoring is required for Moshi's operations?

Assumptions:

  • BUSINESS POSTURE: The primary goal is to provide a reliable and efficient JSON library. Security is a high priority, but performance and ease of use are also important considerations.
  • SECURITY POSTURE: The development team follows secure coding practices. The library is regularly updated to address security vulnerabilities. Users are responsible for securely handling the data they process with Moshi.
  • DESIGN: Moshi is primarily used as an embedded library within other applications. The build process includes security checks like SAST and SCA. The deployment environment is secure and follows best practices.