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BUSINESS POSTURE

  • Business Priorities and Goals:
    • Provide a reusable, cross-platform C++ network library (ytknetwork) to simplify network programming for internal projects.
    • Enhance development efficiency by offering a robust and feature-rich networking component, reducing the need to develop network functionalities from scratch for each project.
    • Potentially offer ytknetwork as a product or service to external users in the future, expanding the company's offerings.
    • Ensure the library is performant, reliable, and secure to meet the demands of various applications.
  • Most Important Business Risks:
    • Security vulnerabilities in ytknetwork could be exploited in applications that depend on it, leading to data breaches, service disruptions, and reputational damage.
    • Poor performance or instability of the library could negatively impact the performance and reliability of applications using it, affecting user experience and business operations.
    • Lack of maintainability or inadequate documentation could increase development costs and risks associated with long-term usage and updates.
    • If intended for external use, failing to meet security and quality expectations could harm the company's reputation and hinder market adoption.

SECURITY POSTURE

  • Existing Security Controls:
    • security control: TLS/SSL support for encrypted communication. Implemented within the library's networking functionalities, enabling secure data transmission over networks. Described in the library's documentation and examples related to secure sockets and protocols.
  • Accepted Risks:
    • accepted risk: Potential vulnerabilities in third-party dependencies (e.g., OpenSSL) used by ytknetwork. Mitigation relies on timely updates of dependencies and monitoring security advisories.
    • accepted risk: Undiscovered vulnerabilities in the ytknetwork codebase itself. Mitigation relies on ongoing code reviews, testing, and community feedback if open-sourced or used externally.
  • Recommended Security Controls:
    • security control: Implement static application security testing (SAST) tools in the build pipeline to automatically detect potential security vulnerabilities in the codebase.
    • security control: Integrate dependency scanning tools to identify known vulnerabilities in third-party libraries used by ytknetwork and ensure timely updates.
    • security control: Conduct regular dynamic application security testing (DAST) or penetration testing on applications that utilize ytknetwork to identify runtime security issues.
    • security control: Implement fuzz testing to discover input validation vulnerabilities and unexpected behavior when handling malformed network data.
    • security control: Establish a security incident response plan to effectively handle any security vulnerabilities discovered in ytknetwork or applications using it.
    • security control: Implement security logging and monitoring within applications using ytknetwork to detect and respond to potential security incidents in runtime.
    • security control: Provide security training for developers contributing to ytknetwork to promote secure coding practices and awareness of common network security vulnerabilities.
  • Security Requirements:
    • Authentication:
      • ytknetwork itself does not handle application-level authentication.
      • Requirement: Ensure applications using ytknetwork implement appropriate authentication mechanisms when required.
      • Requirement: ytknetwork should support secure transport protocols like TLS, which can provide mutual authentication at the transport layer if configured.
    • Authorization:
      • ytknetwork itself does not enforce application-level authorization.
      • Requirement: Applications using ytknetwork must implement their own authorization logic to control access to resources and functionalities.
      • Requirement: ytknetwork should not bypass or interfere with any authorization mechanisms implemented by applications.
    • Input Validation:
      • Requirement: ytknetwork must rigorously validate all network inputs to prevent vulnerabilities such as injection attacks (e.g., command injection, format string bugs), buffer overflows, and denial-of-service attacks.
      • Requirement: Input validation should be performed at multiple layers, including protocol parsing, data deserialization, and handling of user-provided data within network messages.
    • Cryptography:
      • Requirement: When using cryptography (e.g., for TLS/SSL), ytknetwork must use strong and up-to-date cryptographic algorithms and libraries (like OpenSSL).
      • Requirement: Proper key management practices should be followed if ytknetwork is involved in key handling (though less likely for a general network library).
      • Requirement: Ensure that cryptographic operations are implemented correctly to avoid common pitfalls like side-channel attacks or misuse of APIs.

DESIGN

C4 CONTEXT

flowchart LR
    subgraph "Kanyun Inc."
        ytknetwork["ytknetwork Library"]
    end
    Developers["Developers"]
    Applications["Applications"]
    OperatingSystems["Operating Systems\n(Linux, Windows, macOS)"]
    NetworkInfrastructure["Network Infrastructure\n(Routers, Firewalls)"]
    DependencyRepositories["Dependency Repositories\n(e.g., NuGet, vcpkg)"]

    Developers --> ytknetwork
    Applications --> ytknetwork
    ytknetwork --> OperatingSystems
    ytknetwork --> NetworkInfrastructure
    ytknetwork --> DependencyRepositories
    Applications --> NetworkInfrastructure

    style ytknetwork fill:#f9f,stroke:#333,stroke-width:2px
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  • Context Diagram Elements:
    • Element:
      • Name: Developers
      • Type: Person
      • Description: Software developers within Kanyun Inc. who will use the ytknetwork library to build network-enabled applications.
      • Responsibilities:
        • Utilize ytknetwork to implement network functionalities in their applications.
        • Provide feedback and contribute to the development of ytknetwork.
      • Security controls:
        • security control: Secure development training to ensure developers use ytknetwork securely.
        • security control: Code reviews to ensure proper and secure usage of ytknetwork in applications.
    • Element:
      • Name: Applications
      • Type: Software System
      • Description: Various software applications developed by Kanyun Inc. that will integrate and utilize the ytknetwork library for networking capabilities. These applications can range from internal tools to customer-facing products.
      • Responsibilities:
        • Utilize ytknetwork to handle network communication.
        • Implement application-level security controls, such as authentication and authorization, on top of the networking layer provided by ytknetwork.
      • Security controls:
        • security control: Application-level security testing (DAST, penetration testing).
        • security control: Security logging and monitoring of application activities, including network interactions.
    • Element:
      • Name: ytknetwork Library
      • Type: Software System
      • Description: The ytknetwork cross-platform C++ network library being designed. It provides functionalities for TCP, UDP, HTTP, WebSocket, SSL/TLS, and DNS, aiming to simplify network programming.
      • Responsibilities:
        • Provide robust and efficient network communication functionalities.
        • Handle low-level network operations and protocol implementations.
        • Offer a secure foundation for network communication, including support for encryption and secure protocols.
      • Security controls:
        • security control: Secure Software Development Lifecycle (SSDLC) practices during development.
        • security control: Static Application Security Testing (SAST) during build process.
        • security control: Dependency scanning to manage vulnerabilities in third-party libraries.
        • security control: Fuzz testing to identify input validation issues.
    • Element:
      • Name: Operating Systems
      • Type: Infrastructure
      • Description: Target operating systems where applications using ytknetwork will be deployed, including Linux, Windows, and macOS.
      • Responsibilities:
        • Provide the underlying operating system functionalities required by ytknetwork and applications.
        • Manage system-level security controls, such as firewalls and access controls.
      • Security controls:
        • security control: Operating system hardening and security patching.
        • security control: Host-based intrusion detection systems (HIDS) if applicable.
    • Element:
      • Name: Network Infrastructure
      • Type: Infrastructure
      • Description: The underlying network infrastructure, including routers, switches, firewalls, and load balancers, that facilitates network communication for applications using ytknetwork.
      • Responsibilities:
        • Provide network connectivity and routing for applications.
        • Enforce network security policies, such as firewall rules and network segmentation.
      • Security controls:
        • security control: Network firewalls to control network traffic.
        • security control: Intrusion detection and prevention systems (IDPS).
        • security control: Network segmentation to limit the impact of breaches.
    • Element:
      • Name: Dependency Repositories
      • Type: External System
      • Description: External repositories like NuGet, vcpkg, or system package managers from where ytknetwork and its dependencies (e.g., OpenSSL) are obtained during the build process.
      • Responsibilities:
        • Provide necessary libraries and dependencies for building ytknetwork.
        • Ensure the availability and integrity of packages.
      • Security controls:
        • security control: Dependency scanning to identify vulnerable dependencies.
        • security control: Using trusted and reputable dependency repositories.
        • security control: Software Composition Analysis (SCA) to manage open source components.

C4 CONTAINER

flowchart LR
    subgraph "Kanyun Inc."
        subgraph "ytknetwork Library"
            CoreLibrary["Core Network Library\n(C++ Components)"]
            BuildSystem["Build System\n(CMake, Scripts)"]
            Documentation["Documentation\n(API Docs, Examples)"]
        end
    end
    Developers["Developers"]
    Applications["Applications"]

    Developers --> CoreLibrary
    Developers --> BuildSystem
    Developers --> Documentation
    Applications --> CoreLibrary

    style CoreLibrary fill:#f9f,stroke:#333,stroke-width:2px
    style BuildSystem fill:#f9f,stroke:#333,stroke-width:2px
    style Documentation fill:#f9f,stroke:#333,stroke-width:2px
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  • Container Diagram Elements:
    • Element:
      • Name: Core Network Library
      • Type: Container - Library (C++)
      • Description: This container represents the core C++ source code of the ytknetwork library. It includes all the modules and components that implement the network functionalities, such as TCP/UDP socket handling, HTTP/WebSocket protocols, SSL/TLS encryption, and DNS resolution.
      • Responsibilities:
        • Implement all network functionalities as specified in the design.
        • Provide a well-defined and documented API for applications to use.
        • Ensure efficient and secure network operations.
      • Security controls:
        • security control: Secure coding practices during development.
        • security control: Input validation implemented within the library's code.
        • security control: Proper handling of cryptographic operations and key management (if applicable within the library itself).
        • security control: Memory safety checks to prevent buffer overflows and other memory-related vulnerabilities.
    • Element:
      • Name: Build System
      • Type: Container - Build Scripts (CMake, etc.)
      • Description: This container includes the build system configuration files (e.g., CMakeLists.txt), scripts, and tools required to compile, link, and package the ytknetwork library. It manages the build process across different platforms and configurations.
      • Responsibilities:
        • Automate the build process for different target platforms (Linux, Windows, macOS).
        • Manage dependencies and integrate them into the build.
        • Generate build artifacts (static/dynamic libraries, headers).
      • Security controls:
        • security control: Secure build environment to prevent tampering with build artifacts.
        • security control: Integration of SAST and dependency scanning tools into the build pipeline.
        • security control: Verification of downloaded dependencies using checksums or signatures.
    • Element:
      • Name: Documentation
      • Type: Container - Documentation Files
      • Description: This container represents all the documentation related to the ytknetwork library, including API documentation, usage guides, examples, and developer documentation. It is crucial for developers to understand and use the library effectively and securely.
      • Responsibilities:
        • Provide comprehensive and accurate documentation of the library's API and functionalities.
        • Include security considerations and best practices in the documentation.
        • Offer examples demonstrating secure usage patterns of the library.
      • Security controls:
        • security control: Review documentation for clarity and accuracy, especially regarding security-sensitive aspects.
        • security control: Host documentation on a secure platform to prevent tampering.

DEPLOYMENT

  • Deployment Architecture Options:

    • Option 1: Library integrated into standalone applications deployed on virtual machines or bare metal servers.
    • Option 2: Library integrated into containerized applications deployed in container orchestration platforms (e.g., Kubernetes).
    • Option 3: Library used in serverless functions deployed in cloud environments.

  • Detailed Deployment Architecture (Option 2 - Containerized Application in Kubernetes):

flowchart LR
    subgraph "Kubernetes Cluster"
        subgraph "Nodes"
            subgraph "Node 1"
                ApplicationContainer1["Application Container\n(using ytknetwork)"]
            end
            subgraph "Node 2"
                ApplicationContainer2["Application Container\n(using ytknetwork)"]
            end
        end
        KubernetesService["Kubernetes Service\n(Load Balancer)"]
    end
    Internet["Internet"]

    Internet --> KubernetesService
    KubernetesService --> ApplicationContainer1
    KubernetesService --> ApplicationContainer2

    style ApplicationContainer1 fill:#f9f,stroke:#333,stroke-width:2px
    style ApplicationContainer2 fill:#f9f,stroke:#333,stroke-width:2px
    style KubernetesService fill:#ccf,stroke:#333,stroke-width:2px
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  • Deployment Diagram Elements (Option 2):
    • Element:
      • Name: Kubernetes Cluster
      • Type: Environment - Container Orchestration Platform
      • Description: A Kubernetes cluster provides the infrastructure for deploying, managing, and scaling containerized applications that utilize the ytknetwork library.
      • Responsibilities:
        • Orchestrate and manage application containers.
        • Provide load balancing and service discovery.
        • Ensure high availability and scalability of applications.
      • Security controls:
        • security control: Kubernetes network policies to control network traffic between pods.
        • security control: Role-Based Access Control (RBAC) to manage access to Kubernetes resources.
        • security control: Regular security audits and updates of the Kubernetes cluster.
    • Element:
      • Name: Nodes (Node 1, Node 2)
      • Type: Infrastructure - Virtual Machines/Physical Servers
      • Description: Worker nodes within the Kubernetes cluster where application containers are deployed and executed.
      • Responsibilities:
        • Run application containers.
        • Provide compute resources (CPU, memory, network) for containers.
      • Security controls:
        • security control: Operating system hardening on nodes.
        • security control: Container runtime security (e.g., using secure container runtimes like containerd or CRI-O).
        • security control: Node-level security monitoring and intrusion detection.
    • Element:
      • Name: Application Container (ApplicationContainer1, ApplicationContainer2)
      • Type: Container - Docker Container
      • Description: Docker containers packaging applications that use the ytknetwork library. These containers are deployed and managed within the Kubernetes cluster.
      • Responsibilities:
        • Run the application logic that utilizes ytknetwork for network communication.
        • Implement application-level security controls.
      • Security controls:
        • security control: Container image scanning for vulnerabilities.
        • security control: Principle of least privilege for container processes.
        • security control: Application-level firewalls within containers if needed.
    • Element:
      • Name: Kubernetes Service
      • Type: Component - Load Balancer
      • Description: A Kubernetes Service of type LoadBalancer that exposes the application to the internet. It distributes incoming traffic across multiple application container instances.
      • Responsibilities:
        • Provide a single entry point for external traffic to access the application.
        • Load balance traffic across application containers for scalability and resilience.
      • Security controls:
        • security control: Network firewalls associated with the load balancer to filter traffic.
        • security control: TLS termination at the load balancer for secure HTTPS access.
    • Element:
      • Name: Internet
      • Type: External Environment
      • Description: The public internet from where users access the applications deployed using ytknetwork.
      • Responsibilities:
        • Source of user traffic and requests to the applications.
      • Security controls:
        • security control: N/A - external environment, security is managed on the Kanyun Inc. side.

BUILD

flowchart LR
    Developer["Developer"] --> SourceCodeControl["Source Code Control\n(e.g., Git)"]
    SourceCodeControl --> BuildSystem["Build System\n(CI/CD Pipeline)"]
    BuildSystem --> SAST["SAST Scanner"]
    BuildSystem --> DependencyScan["Dependency Scanner"]
    BuildSystem --> Compiler["Compiler\n(C++)"]
    Compiler --> BuildArtifacts["Build Artifacts\n(Libraries, Headers)"]
    BuildArtifacts --> ArtifactRepository["Artifact Repository\n(e.g., NuGet Feed)"]

    style BuildSystem fill:#ccf,stroke:#333,stroke-width:2px
    style BuildArtifacts fill:#f9f,stroke:#333,stroke-width:2px
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  • Build Process Description:

    • Developers commit code changes to a Source Code Control system (e.g., Git/GitHub).
    • A Build System (CI/CD pipeline, e.g., GitHub Actions, Jenkins) is triggered upon code changes.
    • The Build System performs the following security checks:
      • Static Application Security Testing (SAST) is executed to scan the codebase for potential vulnerabilities.
      • Dependency scanning is performed to identify known vulnerabilities in third-party libraries.
    • The Build System compiles the C++ code using a compiler.
    • Build Artifacts (libraries, headers) are generated.
    • Build Artifacts are published to an Artifact Repository (e.g., NuGet feed, internal repository) for consumption by other projects and applications.

  • Build Process Security Controls:

    • security control: Secure Build Environment: Ensure the build environment (CI/CD agents) is hardened and regularly updated to prevent compromise.
    • security control: Automated Build Process: Automate the build process to ensure consistency and repeatability, reducing manual errors and potential security oversights.
    • security control: Static Application Security Testing (SAST): Integrate SAST tools into the build pipeline to automatically detect code-level vulnerabilities early in the development cycle.
    • security control: Dependency Scanning: Utilize dependency scanning tools to identify and manage vulnerabilities in third-party libraries used by ytknetwork.
    • security control: Code Signing (optional): Sign build artifacts to ensure integrity and authenticity, especially if the library is distributed externally.
    • security control: Access Control to Build System: Restrict access to the build system and artifact repository to authorized personnel only.
    • security control: Audit Logging of Build Activities: Log all build activities for auditing and security monitoring purposes.

RISK ASSESSMENT

  • Critical Business Processes:
    • The critical business processes that ytknetwork supports are dependent on the applications that utilize it. If applications built with ytknetwork are involved in core business operations such as:
      • Customer communication and data exchange.
      • Internal system communication and data flow.
      • Potentially, if offered externally, applications of external customers.
    • Disruption or compromise of these processes due to vulnerabilities in ytknetwork could significantly impact business continuity, data security, and customer trust.
  • Data Sensitivity:
    • The sensitivity of data handled by ytknetwork also depends on the applications using it. Given that it's a network library, it could potentially handle:
      • Sensitive user data (PII - Personally Identifiable Information) if applications transmit user data over the network.
      • Authentication credentials if applications implement authentication mechanisms over network connections.
      • Confidential business data if used for internal communications.
      • Financial data if applications are involved in financial transactions.
    • The sensitivity level can range from low to high depending on the specific application context. For threat modeling purposes, it's prudent to assume that ytknetwork might handle sensitive data and design security controls accordingly.

QUESTIONS & ASSUMPTIONS

  • Questions:
    • What are the primary applications or use cases within Kanyun Inc. that will utilize ytknetwork initially? Understanding the specific applications will help tailor security requirements and risk assessments.
    • Are there any specific performance benchmarks or latency requirements for network communication in the intended use cases? Performance requirements can influence design choices and security implementation.
    • Are there any existing security policies or compliance standards within Kanyun Inc. that ytknetwork and applications using it must adhere to?
    • What is the intended distribution model for ytknetwork? Will it be solely for internal use, or is there a plan to release it as open source or a commercial product? Distribution model impacts security considerations and update mechanisms.
    • What is the expected lifespan and maintenance plan for ytknetwork? Long-term maintenance and security updates are crucial for a foundational library.
  • Assumptions:
    • Assumption: ytknetwork is initially intended for internal use within Kanyun Inc., with potential for external use in the future.
    • Assumption: Security is a significant concern for ytknetwork, and the goal is to build a secure and reliable network library.
    • Assumption: Applications using ytknetwork may handle sensitive data, requiring robust security measures in the library and the applications themselves.
    • Assumption: Standard secure software development practices will be followed during the development of ytknetwork.
    • Assumption: There is an existing or planned CI/CD pipeline within Kanyun Inc. that can be leveraged to implement automated build and security checks for ytknetwork.