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sec-design.md

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BUSINESS POSTURE

  • Business Priorities and Goals:
    • Provide a robust, flexible, and widely adopted logging library for Go applications.
    • Enable developers to easily integrate structured logging into their Go projects.
    • Maintain high performance and minimal overhead to avoid impacting application performance.
    • Foster a strong community around the library for contributions and support.
  • Business Risks:
    • Security vulnerabilities in logrus could impact a large number of applications that depend on it.
    • Performance bottlenecks introduced by logrus could negatively affect applications.
    • Lack of maintenance or slow response to issues could reduce developer trust and adoption.
    • Incompatibility with newer Go versions or logging standards could limit its long-term usability.

SECURITY POSTURE

  • Existing Security Controls:

    • security control: Open Source Code - The source code is publicly available on GitHub (https://github.com/sirupsen/logrus), allowing for community review and scrutiny.
    • security control: Community Contributions - The project benefits from community contributions, including bug fixes and feature enhancements, which can indirectly improve security.
    • accepted risk: Reliance on Community Security Audits - Security audits are primarily driven by the community and may not be as frequent or comprehensive as dedicated security reviews.
    • accepted risk: Vulnerability Response Time - Response time to reported vulnerabilities depends on maintainer availability and community contributions.

  • Recommended Security Controls:

    • security control: Automated Dependency Scanning - Implement automated checks for known vulnerabilities in dependencies used by logrus.
    • security control: Static Application Security Testing (SAST) - Integrate SAST tools into the CI/CD pipeline to automatically scan the logrus codebase for potential security flaws.
    • security control: Vulnerability Disclosure Policy - Establish a clear process for reporting and handling security vulnerabilities, including a security contact and expected response times.
    • security control: Security Contact - Designate a security contact or security team responsible for handling security-related inquiries and vulnerability reports.

  • Security Requirements:

    • Authentication:
      • Not directly applicable to logrus as it is a logging library. Authentication is the responsibility of the applications using logrus when interacting with logging backends.
    • Authorization:
      • Not directly applicable to logrus. Authorization is the responsibility of the applications using logrus to control access to log data and logging configurations.
    • Input Validation:
      • Log message inputs should be handled carefully by applications using logrus to prevent log injection attacks if logs are processed by external systems. logrus itself should handle formatting and encoding of log messages safely.
    • Cryptography:
      • logrus itself does not directly implement cryptography. However, applications using logrus might log sensitive data that requires encryption at rest or in transit when sent to logging backends. This is the responsibility of the application and the logging backend infrastructure.

DESIGN

  • C4 CONTEXT
flowchart LR
    subgraph "Organization Context"
        A["Go Developer"]:::person
        B["Go Application"]:::software_system
        C["Logging Backend"]:::software_system
    end
    A -->|Uses logrus library| B
    B -->|Sends logs| C
    B -->|Uses logrus library| D["logrus"]:::software_system
    style A person
    style B,C,D software_system
    classDef person fill:#8dd1e1,stroke:#333,stroke-width:2px
    classDef software_system fill:#f2f2f2,stroke:#333,stroke-width:2px
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  • Context Diagram Elements:

      • Name: Go Developer
      • Type: Person
      • Description: Software developers who use the logrus library in their Go applications.
      • Responsibilities: Integrate logrus into their Go applications to enable logging. Configure logrus to meet their application's logging needs.
      • Security controls: Secure development practices when using and configuring logrus.
      • Name: Go Application
      • Type: Software System
      • Description: Applications written in Go that utilize the logrus library for logging purposes.
      • Responsibilities: Generate log messages using logrus. Configure logrus to send logs to appropriate logging backends. Handle sensitive data in logs securely.
      • Security controls: Input validation for log messages. Secure configuration of logging backends. Encryption of sensitive log data if necessary.
      • Name: Logging Backend
      • Type: Software System
      • Description: External systems that receive and store logs generated by Go applications using logrus. Examples include Elasticsearch, cloud logging services, file systems.
      • Responsibilities: Receive, store, and potentially process log messages. Provide interfaces for querying and analyzing logs. Ensure the security and integrity of stored logs.
      • Security controls: Access control to log data. Encryption of logs at rest and in transit. Audit logging of access to logs.
      • Name: logrus
      • Type: Software System
      • Description: The logrus logging library itself. A Go package that provides structured logging capabilities.
      • Responsibilities: Provide a flexible and efficient API for logging in Go applications. Format and output log messages to various destinations. Be reliable and performant.
      • Security controls: Secure coding practices in the development of logrus. Vulnerability management and timely patching.

  • C4 CONTAINER

flowchart LR
    subgraph "Go Application"
        A["logrus Library"]:::library
        B["Application Code"]:::container
    end
    B -->|Uses logging API| A
    B -->|Sends logs via logrus| C["Logging Backend"]:::software_system
    style A library
    style B container
    style C software_system
    classDef library fill:#ccebc5,stroke:#333,stroke-width:2px
    classDef container fill:#f2f2f2,stroke:#333,stroke-width:2px
    classDef software_system fill:#f2f2f2,stroke:#333,stroke-width:2px
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  • Container Diagram Elements:

      • Name: logrus Library
      • Type: Library
      • Description: The logrus Go library, integrated as a dependency within Go applications.
      • Responsibilities: Provide logging API for applications. Format log messages. Handle different log levels and output formats.
      • Security controls: Secure coding practices in library development. Vulnerability scanning of library dependencies.
      • Name: Application Code
      • Type: Container
      • Description: The main codebase of the Go application that utilizes the logrus library.
      • Responsibilities: Implement application logic. Generate log messages using logrus API. Configure logrus for desired logging behavior.
      • Security controls: Secure coding practices in application development. Input validation for data logged. Proper handling of sensitive data.
      • Name: Logging Backend
      • Type: Software System
      • Description: External system receiving logs from the Go application via logrus.
      • Responsibilities: Receive and store logs. Provide access to logs for analysis and monitoring.
      • Security controls: Access control to logs. Secure storage and transmission of logs.

  • DEPLOYMENT

Deployment is not directly applicable to logrus itself, as it is a library. logrus is deployed as part of the Go applications that use it. The deployment architecture will depend on how the Go application is deployed.

Assuming a common deployment scenario for a Go application:

flowchart LR
    subgraph "Development Environment"
        A["Developer Workstation"]:::dev_env
    end
    subgraph "Production Environment"
        subgraph "Cloud Provider (e.g., AWS, GCP, Azure)"
            B["Virtual Machine / Container Instance"]:::vm_container
            C["Logging Backend Service"]:::cloud_service
        end
    end
    A -->|Develops & Builds Application| B
    B -->|Sends Logs| C
    style A dev_env
    style B vm_container
    style C cloud_service
    classDef dev_env fill:#ffe0b2,stroke:#333,stroke-width:2px
    classDef vm_container fill:#f2f2f2,stroke:#333,stroke-width:2px
    classDef cloud_service fill:#ccebc5,stroke:#333,stroke-width:2px
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  • Deployment Diagram Elements (for a Go application using logrus):

      • Name: Developer Workstation
      • Type: Development Environment
      • Description: Developer's local machine used for writing code, building, and testing the Go application that uses logrus.
      • Responsibilities: Code development, local testing, building application binaries.
      • Security controls: Secure workstation configuration, code review, developer training on secure coding practices.
      • Name: Virtual Machine / Container Instance
      • Type: VM / Container
      • Description: The runtime environment where the Go application (including logrus library) is deployed and executed in production. Could be a VM in the cloud, a container in a container orchestration platform (like Kubernetes), or a server.
      • Responsibilities: Run the Go application. Execute application logic. Generate and send logs via logrus.
      • Security controls: Hardened OS and runtime environment. Network security controls (firewalls, network segmentation). Regular security patching. Access control to the VM/container.
      • Name: Logging Backend Service
      • Type: Cloud Service
      • Description: A managed logging service provided by a cloud provider (e.g., AWS CloudWatch, GCP Cloud Logging, Azure Monitor Logs) or a self-hosted logging system (e.g., Elasticsearch cluster).
      • Responsibilities: Receive, store, index, and provide querying capabilities for logs sent by the Go application. Ensure log data availability and durability.
      • Security controls: Access control to log data. Encryption of logs at rest and in transit. Audit logging of access. Data retention policies.

  • BUILD

flowchart LR
    A["Developer"] -->|Code Changes, Commit, Push| B["GitHub Repository"]
    B -->|Webhook, Trigger| C["CI/CD System (e.g., GitHub Actions)"]
    C -->|Build, Test, Lint, SAST, Dependency Scan| D["Build Artifacts (logrus package)"]
    D -->|Publish| E["Go Package Registry (e.g., pkg.go.dev)"]
    style A person
    style B,E fill:#f2f2f2,stroke:#333,stroke-width:2px
    style C,D fill:#ccebc5,stroke:#333,stroke-width:2px
    classDef person fill:#8dd1e1,stroke:#333,stroke-width:2px
    classDef fill:#f2f2f2,stroke:#333,stroke-width:2px
    classDef fill:#ccebc5,stroke:#333,stroke-width:2px
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  • Build Process Elements:
      • Name: Developer
      • Type: Person
      • Description: Software developer contributing to the logrus project.
      • Responsibilities: Write code, commit changes, push code to the GitHub repository.
      • Security controls: Secure coding practices. Code review process.
      • Name: GitHub Repository
      • Type: Code Repository
      • Description: The GitHub repository (https://github.com/sirupsen/logrus) hosting the logrus source code.
      • Responsibilities: Version control, source code management, collaboration platform.
      • Security controls: Access control to the repository. Branch protection. Audit logging of repository actions.
      • Name: CI/CD System (e.g., GitHub Actions)
      • Type: Build Automation System
      • Description: Automated system that builds, tests, and performs security checks on the logrus codebase upon code changes.
      • Responsibilities: Automated build process. Unit testing. Linting. Static Application Security Testing (SAST). Dependency scanning.
      • Security controls: Secure CI/CD pipeline configuration. Access control to CI/CD system. Secrets management for build credentials.
      • Name: Build Artifacts (logrus package)
      • Type: Artifact
      • Description: The compiled and packaged logrus library, ready to be distributed and used by Go applications.
      • Responsibilities: Represent the distributable form of the logrus library.
      • Security controls: Integrity checks (e.g., checksums) of build artifacts. Secure storage of build artifacts before publishing.
      • Name: Go Package Registry (e.g., pkg.go.dev)
      • Type: Package Registry
      • Description: Public registry where Go packages, including logrus, are published and made available for download by Go developers.
      • Responsibilities: Host and distribute Go packages. Provide package versioning and dependency management.
      • Security controls: Package integrity verification. Protection against package tampering.

RISK ASSESSMENT

  • Critical Business Processes:
    • Logging functionality in Go applications that depend on logrus. If logrus has vulnerabilities or malfunctions, it can impact the reliability and security of applications using it. This can affect monitoring, debugging, security incident response, and overall application stability.
  • Data to Protect and Sensitivity:
    • Log messages generated by applications using logrus. The sensitivity of this data depends entirely on what the applications log. It could range from non-sensitive informational messages to highly sensitive data like:
      • Personally Identifiable Information (PII): Usernames, email addresses, IP addresses, etc.
      • Application Secrets: API keys, passwords (though logging passwords is a very bad practice).
      • Business-critical data: Transaction details, financial information, etc.
    • The sensitivity level needs to be determined by each application that uses logrus based on their specific logging practices and data being logged.

QUESTIONS & ASSUMPTIONS

  • Questions:

    • What is the intended scope of security responsibility for the logrus project maintainers versus the applications that use logrus?
    • Are there any specific security certifications or compliance requirements that logrus aims to meet?
    • Is there a dedicated security contact or team for the logrus project to handle vulnerability reports?
    • What is the process for handling and disclosing security vulnerabilities in logrus?

  • Assumptions:

    • logrus is intended to be used in a wide variety of Go applications, including those that handle sensitive data.
    • Security is a significant concern for a widely used logging library like logrus.
    • The primary security responsibility for logrus maintainers is to ensure the library itself is free from vulnerabilities and to provide secure coding practices.
    • Applications using logrus are responsible for securely configuring logging, handling sensitive data in logs, and protecting the logging infrastructure.