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sec-design.md

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BUSINESS POSTURE

This project, "compressor", provides a command-line tool for file compression and decompression.

  • Business Priorities and Goals:

    • Primary goal: Efficiently compress and decompress files using various algorithms (gzip, zstd, brotli, etc.).
    • Potential priorities:
      • Performance: Fast compression and decompression speeds.
      • Compression ratio: Achieving high compression rates to reduce file sizes.
      • Algorithm support: Supporting a wide range of compression algorithms.
      • Ease of use: Simple and intuitive command-line interface.
      • Cross-platform compatibility: Working on different operating systems (Linux, macOS, Windows).
      • Open-source and community driven: Encouraging contributions and community support.

  • Business Risks:

    • Data integrity risk: Corruption of data during compression or decompression.
    • Performance bottleneck risk: Inefficient compression or decompression algorithms leading to slow processing.
    • Compatibility risk: Issues with file format compatibility across different systems or versions.
    • Security vulnerability risk: Vulnerabilities in the compression/decompression algorithms or the tool itself that could be exploited.
    • Supply chain risk: Dependencies on external libraries or components that might introduce vulnerabilities.
    • Availability risk: Tool unavailability due to bugs or infrastructure issues if deployed as a service.

SECURITY POSTURE

  • Existing Security Controls:

    • security control: Open-source code - publicly available for review and scrutiny on GitHub. Implemented: GitHub repository.
    • security control: Use of well-established compression libraries (gzip, zstd, brotli). Implemented: Codebase dependencies.
    • security control: Go language - benefits from Go's memory safety features. Implemented: Programming language choice.

  • Accepted Risks:

    • accepted risk: Reliance on community contributions for security vulnerability identification and patching.
    • accepted risk: Potential vulnerabilities in underlying compression libraries that are beyond the project's direct control.
    • accepted risk: Lack of formal security audits or penetration testing.

  • Recommended Security Controls:

    • security control: Implement automated security scanning (SAST/DAST) in the CI/CD pipeline.
    • security control: Dependency vulnerability scanning to identify and address vulnerabilities in used libraries.
    • security control: Regular updates of dependencies to incorporate security patches.
    • security control: Input validation to prevent path traversal or other input-based vulnerabilities.
    • security control: Consider code signing for releases to ensure integrity and authenticity.

  • Security Requirements:

    • Authentication: Not applicable for a command-line tool used locally. If deployed as a service, authentication would be required.
    • Authorization: Not applicable for a command-line tool used locally. If deployed as a service, authorization would be required to control access to compression/decompression functionalities.
    • Input Validation:
      • Requirement: Validate file paths provided as input to prevent path traversal vulnerabilities.
      • Requirement: Validate compression algorithm choices to ensure supported algorithms are used.
      • Requirement: Handle potentially large input files gracefully to prevent denial-of-service conditions.
    • Cryptography:
      • Requirement: Ensure correct and secure usage of cryptographic libraries used in compression algorithms (if any).
      • Requirement: If encryption features are added in the future, follow secure cryptographic practices.

DESIGN

C4 CONTEXT

graph LR
    subgraph "User's Environment"
        U[User]
    end
    C[Compressor Tool]
    F[File System]

    U --> C
    C --> F
    F --> C

    style C fill:#f9f,stroke:#333,stroke-width:2px
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  • Context Diagram Elements:
    • Element:
      • Name: User
      • Type: Person
      • Description: Individual who uses the "compressor" tool to compress or decompress files.
      • Responsibilities: Provides input files and commands to the compressor tool, receives compressed or decompressed files.
      • Security controls: User's local machine security controls, access control to files on their file system.
    • Element:
      • Name: Compressor Tool
      • Type: Software System
      • Description: Command-line application for compressing and decompressing files using various algorithms.
      • Responsibilities: Reads input files, performs compression or decompression based on user commands, writes output files to the file system.
      • Security controls: Input validation, secure handling of file system operations, dependency vulnerability management, build process security.
    • Element:
      • Name: File System
      • Type: System
      • Description: Local file system where input files are stored and output files are written.
      • Responsibilities: Stores files, provides access to files for the compressor tool.
      • Security controls: File system permissions, access control lists, encryption at rest (if configured by the user).

C4 CONTAINER

graph LR
    subgraph "User's Environment"
        U[User]
    end
    subgraph "Compressor Tool"
        CLI[Command-Line Interface]
        CL[Compression Libraries]
        FH[File Handler]
    end
    F[File System]

    U --> CLI
    CLI --> FH
    FH --> CL
    FH --> F
    F --> FH

    style CLI fill:#f9f,stroke:#333,stroke-width:2px
    style CL fill:#f9f,stroke:#333,stroke-width:2px
    style FH fill:#f9f,stroke:#333,stroke-width:2px
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  • Container Diagram Elements:
    • Element:
      • Name: Command-Line Interface (CLI)
      • Type: Application
      • Description: Provides the command-line interface for users to interact with the compressor tool, parse commands and arguments.
      • Responsibilities: Accepts user commands, parses arguments (input file paths, output file paths, compression algorithm), invokes File Handler.
      • Security controls: Input validation of command-line arguments, secure parsing of user input.
    • Element:
      • Name: File Handler
      • Type: Application Component
      • Description: Component responsible for reading and writing files to the file system.
      • Responsibilities: Opens, reads, and writes files based on instructions from CLI, handles file paths, interacts with Compression Libraries.
      • Security controls: Input validation of file paths, secure file handling operations, error handling for file system interactions, path traversal prevention.
    • Element:
      • Name: Compression Libraries
      • Type: Library
      • Description: Set of libraries (e.g., gzip, zstd, brotli libraries in Go) used to perform actual compression and decompression operations.
      • Responsibilities: Provides compression and decompression algorithms, performs data processing.
      • Security controls: Dependency vulnerability scanning, regular updates to libraries, ensuring libraries are used correctly and securely.
    • Element:
      • Name: File System
      • Type: System
      • Description: Local file system where input and output files are stored.
      • Responsibilities: Stores files, provides access to files for the File Handler component.
      • Security controls: File system permissions, access control lists, encryption at rest (if configured by the user).

DEPLOYMENT

Deployment Scenario: Local execution on user's machine.

graph LR
    subgraph "User's Local Machine"
        OS[Operating System]
        CPU[CPU]
        Memory[Memory]
        Disk[Disk]
        subgraph "Deployment Environment"
            Compressor[Compressor Executable]
        end
    end

    Compressor --> OS
    Compressor --> CPU
    Compressor --> Memory
    Compressor --> Disk
    OS --> CPU
    OS --> Memory
    OS --> Disk

    style Compressor fill:#f9f,stroke:#333,stroke-width:2px
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  • Deployment Diagram Elements:
    • Element:
      • Name: Compressor Executable
      • Type: Software
      • Description: Compiled binary of the "compressor" tool, deployed on the user's local machine.
      • Responsibilities: Executes compression and decompression tasks when run by the user.
      • Security controls: Code signing (optional), integrity checks of the executable.
    • Element:
      • Name: Operating System
      • Type: Infrastructure
      • Description: User's operating system (e.g., Linux, macOS, Windows) providing the runtime environment.
      • Responsibilities: Provides system resources, manages processes, handles file system operations.
      • Security controls: Operating system security controls (firewall, access control, patching), user account controls.
    • Element:
      • Name: CPU
      • Type: Infrastructure
      • Description: Central Processing Unit for executing the compressor tool's code.
      • Responsibilities: Processing instructions, performing computations.
      • Security controls: Hardware security features (if any).
    • Element:
      • Name: Memory
      • Type: Infrastructure
      • Description: RAM used by the compressor tool during execution.
      • Responsibilities: Storing program code and data during runtime.
      • Security controls: Memory protection mechanisms provided by the OS.
    • Element:
      • Name: Disk
      • Type: Infrastructure
      • Description: Hard disk or SSD where the compressor executable and files are stored.
      • Responsibilities: Persistent storage of the compressor tool and files.
      • Security controls: Disk encryption (optional, configured by the user), file system permissions.

BUILD

graph LR
    subgraph "Developer Environment"
        Developer[Developer]
        CodeRepo[Code Repository (GitHub)]
    end
    subgraph "CI/CD Pipeline (GitHub Actions)"
        BuildServer[Build Server (GitHub Actions Runner)]
        Compiler[Go Compiler]
        SAST[SAST Scanner]
        DependencyCheck[Dependency Check]
        ArtifactStorage[Artifact Storage (GitHub Actions Artifacts)]
    end

    Developer --> CodeRepo: Push Code
    CodeRepo --> BuildServer: Trigger Build
    BuildServer --> Compiler: Compile Code
    BuildServer --> SAST: Run SAST
    BuildServer --> DependencyCheck: Check Dependencies
    Compiler --> ArtifactStorage: Create Executable
    SAST --> BuildServer: Report
    DependencyCheck --> BuildServer: Report
    ArtifactStorage --> Release[Release Artifacts]

    style BuildServer fill:#f9f,stroke:#333,stroke-width:2px
    style ArtifactStorage fill:#f9f,stroke:#333,stroke-width:2px
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  • Build Process Elements:
    • Element:
      • Name: Developer
      • Type: Person
      • Description: Software developer who writes and commits code changes.
      • Responsibilities: Writes code, performs local testing, commits and pushes code to the repository.
      • Security controls: Secure development practices, code review, local development environment security.
    • Element:
      • Name: Code Repository (GitHub)
      • Type: System
      • Description: GitHub repository hosting the source code of the "compressor" tool.
      • Responsibilities: Version control, code storage, trigger CI/CD pipeline.
      • Security controls: Access control to the repository, branch protection, audit logs.
    • Element:
      • Name: Build Server (GitHub Actions Runner)
      • Type: Application
      • Description: GitHub Actions runner executing the CI/CD pipeline.
      • Responsibilities: Automates build process, compiles code, runs security scans, creates artifacts.
      • Security controls: Secure build environment, access control to CI/CD configuration, secrets management.
    • Element:
      • Name: Go Compiler
      • Type: Tool
      • Description: Go compiler used to compile the source code into an executable binary.
      • Responsibilities: Compiles Go code.
      • Security controls: Using trusted compiler version.
    • Element:
      • Name: SAST Scanner
      • Type: Tool
      • Description: Static Application Security Testing tool to scan the source code for potential vulnerabilities.
      • Responsibilities: Performs static code analysis, identifies potential security flaws.
      • Security controls: Regularly updated scanner rules, configuration to detect relevant vulnerabilities.
    • Element:
      • Name: Dependency Check
      • Type: Tool
      • Description: Tool to check dependencies for known vulnerabilities.
      • Responsibilities: Scans project dependencies, identifies known vulnerabilities in libraries.
      • Security controls: Regularly updated vulnerability database, configuration to report vulnerabilities.
    • Element:
      • Name: Artifact Storage (GitHub Actions Artifacts)
      • Type: System
      • Description: Storage within GitHub Actions to store build artifacts (e.g., executable).
      • Responsibilities: Stores build artifacts temporarily.
      • Security controls: Access control to artifacts, secure storage.
    • Element:
      • Name: Release Artifacts
      • Type: Software
      • Description: Final build artifacts (e.g., executable) that are released for distribution.
      • Responsibilities: Distributable binaries of the compressor tool.
      • Security controls: Code signing, checksum generation, secure release process.

RISK ASSESSMENT

  • Critical Business Processes:

    • File compression and decompression functionality. Ensuring these processes are reliable, performant, and maintain data integrity is critical.
    • Build and release process. Ensuring the tool is built and released securely to prevent supply chain attacks.

  • Data to Protect and Sensitivity:

    • User files being compressed or decompressed. Sensitivity depends on the content of the files, which can range from public documents to highly confidential data.
    • The compressor tool itself. Protecting the integrity and availability of the tool is important to maintain functionality.
    • Build artifacts and release binaries. Protecting these from tampering is crucial for supply chain security.

QUESTIONS & ASSUMPTIONS

  • BUSINESS POSTURE:

    • Assumption: The primary business goal is to provide a reliable and efficient command-line compression tool for general use.
    • Question: Are there specific target users or industries for this tool? Are there any specific performance or compression ratio requirements?

  • SECURITY POSTURE:

    • Assumption: Current security posture relies on open-source nature and basic secure development practices.
    • Question: Are there any existing security policies or standards that this project should adhere to? Is there a budget allocated for security improvements?

  • DESIGN:

    • Assumption: The tool is primarily intended for local command-line use.
    • Question: Are there plans to deploy this tool as a service or integrate it into other systems? Are there any specific deployment environment constraints or requirements?
    • Assumption: The build process is currently basic and can be enhanced with more security controls.
    • Question: Is there a preferred CI/CD platform or existing build infrastructure that should be used? Are there any specific requirements for build artifact signing or verification?