BUSINESS POSTURE

Business Priorities and Goals:
- Provide a secure and reliable platform for users to discover, install, and manage browser extensions, themes, and other add-ons for Mozilla products, primarily Firefox.
- Ensure the availability of a wide variety of add-ons to enhance user experience and browser functionality.
- Protect users from malicious or harmful add-ons.
- Support the Mozilla ecosystem and community of add-on developers.
- Maintain the integrity and security of the Firefox browser and user data.
Most Important Business Risks:
- Risk of users installing malicious add-ons that could compromise their security and privacy.
- Risk of platform downtime or performance issues affecting user experience and trust.
- Risk of legal and reputational damage due to security breaches or distribution of harmful content.
- Risk of developer dissatisfaction leading to a decrease in the quantity and quality of available add-ons.
- Risk of supply chain attacks targeting the add-on distribution platform.

SECURITY POSTURE

Existing Security Controls:
- security control: Code reviews are likely performed as part of the development process, although not explicitly stated in the provided context. Location: GitHub repository - code review process is standard practice for Mozilla projects.
- security control: Automated testing including unit and integration tests. Location: GitHub repository - test suites are present in the codebase.
- security control: Regular security audits and penetration testing. Location: Mozilla's security practices - Mozilla has a dedicated security team and conducts regular security assessments.
- security control: Input validation and sanitization throughout the application. Location: Codebase - Django framework encourages input validation, and it's expected to be implemented in views and forms.
- security control: Authentication and authorization mechanisms to manage user accounts and developer access. Location: Codebase - Django's authentication and permission framework is likely used.
- security control: HTTPS enforced for all communication. Location: Deployment infrastructure - standard practice for web applications, especially those handling user data.
- security control: Content Security Policy (CSP) to mitigate XSS attacks. Location: Web application configuration - CSP headers are expected to be configured.
- security control: Subresource Integrity (SRI) to ensure integrity of loaded resources. Location: Web application configuration - SRI attributes are expected to be used for external resources.
- security control: Dependency scanning to identify vulnerabilities in third-party libraries. Location: CI/CD pipeline - dependency scanning tools are commonly used in modern development workflows.
- security control: Static Application Security Testing (SAST) to identify potential security flaws in the code. Location: CI/CD pipeline - SAST tools can be integrated into the build process.
- security control: Rate limiting to prevent abuse and denial-of-service attacks. Location: API gateway or application layer - rate limiting is a common practice for public APIs.
- security control: Web Application Firewall (WAF) to protect against common web attacks. Location: Infrastructure - WAF is typically deployed in front of web applications.
- security control: Security monitoring and logging to detect and respond to security incidents. Location: Infrastructure and application - logging and monitoring are essential for security operations.
- accepted risk: Performance impact of security controls. Location: General security vs performance trade-off - security measures can sometimes introduce performance overhead.
- accepted risk: Complexity of security configurations and maintenance. Location: General security operations - managing security controls can be complex and require ongoing effort.
Recommended Security Controls:
- security control: Implement Dynamic Application Security Testing (DAST) in the CI/CD pipeline to identify runtime vulnerabilities.
- security control: Enhance dependency scanning to include software composition analysis (SCA) for license compliance and deeper vulnerability analysis.
- security control: Implement Runtime Application Self-Protection (RASP) for real-time attack detection and prevention.
- security control: Introduce more rigorous add-on validation and scanning processes, including static and dynamic analysis of add-on code before distribution.
- security control: Implement a bug bounty program to encourage external security researchers to find and report vulnerabilities.
- security control: Regularly review and update security configurations and policies.
- security control: Conduct security awareness training for developers and operations teams.
Security Requirements:
- Authentication:
  - requirement: Secure authentication mechanism for users accessing the platform (e.g., Mozilla accounts).
  - requirement: Secure authentication for add-on developers to manage their add-ons.
  - requirement: Multi-factor authentication (MFA) should be considered for developer accounts and administrative access.
- Authorization:
  - requirement: Role-based access control (RBAC) to manage permissions for different user roles (e.g., users, developers, administrators, reviewers).
  - requirement: Fine-grained authorization to control access to specific resources and functionalities.
  - requirement: Enforce least privilege principle for all users and services.
- Input Validation:
  - requirement: Comprehensive input validation for all user inputs to prevent injection attacks (e.g., XSS, SQL injection).
  - requirement: Sanitize user-generated content to prevent malicious scripts from being stored and executed.
  - requirement: Validate file uploads to prevent malicious file uploads.
- Cryptography:
  - requirement: Use strong encryption algorithms and protocols for data in transit (HTTPS) and data at rest (database encryption if applicable).
  - requirement: Securely store and manage cryptographic keys.
  - requirement: Implement proper hashing and salting for password storage.
  - requirement: Ensure compliance with relevant cryptographic standards and regulations.

DESIGN

C4 CONTEXT

flowchart LR
    subgraph Mozilla Ecosystem
        A["Firefox Browser"]
        B["addons.mozilla.org (addons-server)"]
        C["Mozilla Accounts"]
        D["Add-on Developers"]
    end
    E["Internet"]

    A -- Uses Add-ons from --> B
    D -- Uploads Add-ons to --> B
    A -- Authenticates via --> C
    D -- Authenticates via --> C
    B -- Authenticates against --> C
    A -- Connects to --> E
    D -- Connects to --> E
    B -- Connects to --> E

    style B fill:#f9f,stroke:#333,stroke-width:2px

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Context Diagram Elements:
- - Name: Firefox Browser
  - Type: Software System
  - Description: Mozilla Firefox web browser, the primary client application for add-ons.
  - Responsibilities:
    - Request and install add-ons from addons.mozilla.org.
    - Use installed add-ons to enhance browser functionality.
    - Authenticate users via Mozilla Accounts.
  - Security controls:
    - security control: Browser security features (e.g., sandboxing, content security policy enforcement).
    - security control: Add-on permission system to limit add-on capabilities.
    - security control: Regular browser updates to patch security vulnerabilities.
- - Name: addons.mozilla.org (addons-server)
  - Type: Software System
  - Description: The Mozilla Add-ons platform backend, responsible for hosting, managing, and distributing add-ons.
  - Responsibilities:
    - Store and manage add-on metadata and files.
    - Provide a web interface for users to discover and install add-ons.
    - Provide an API for Firefox browsers to access add-on information.
    - Authenticate users and developers via Mozilla Accounts.
    - Process add-on submissions and updates from developers.
    - Enforce add-on review and validation processes.
  - Security controls:
    - security control: Authentication and authorization mechanisms.
    - security control: Input validation and sanitization.
    - security control: Add-on scanning and validation processes.
    - security control: Rate limiting and WAF.
    - security control: Security monitoring and logging.
- - Name: Mozilla Accounts
  - Type: Software System
  - Description: Mozilla's central user account management system, used for authentication across Mozilla services.
  - Responsibilities:
    - Manage user accounts and credentials.
    - Provide authentication services for Firefox Browser and addons.mozilla.org.
  - Security controls:
    - security control: Secure password storage and management.
    - security control: Multi-factor authentication.
    - security control: Account security monitoring and fraud detection.
- - Name: Add-on Developers
  - Type: Person Role
  - Description: Developers who create and maintain add-ons for the Firefox browser.
  - Responsibilities:
    - Develop and package add-ons.
    - Submit add-ons to addons.mozilla.org.
    - Manage and update their add-ons.
    - Adhere to Mozilla's add-on policies and guidelines.
  - Security controls:
    - security control: Developer account security practices (e.g., strong passwords, MFA).
    - security control: Code signing for add-ons (if applicable).
- - Name: Internet
  - Type: Boundary
  - Description: The external network through which users, browsers, and developers access addons.mozilla.org.
  - Responsibilities:
    - Provide network connectivity.
  - Security controls:
    - security control: Network security controls (e.g., firewalls, intrusion detection systems) at the infrastructure level (not directly managed by the project).

C4 CONTAINER

flowchart LR
    subgraph addons.mozilla.org (addons-server)
        A["Web Application"
        \nDjango, Python]
        B["API Server"
        \nDjango REST Framework]
        C["Database"
        \nPostgreSQL]
        D["Storage"
        \nObject Storage (e.g., AWS S3)]
        E["Background Workers"
        \nCelery]
        F["Cache"
        \nRedis/Memcached]
    end
    G["Firefox Browser"]
    H["Mozilla Accounts"]
    I["Add-on Developers"]

    G -- HTTPS --> A
    G -- HTTPS --> B
    I -- HTTPS --> A
    I -- HTTPS --> B
    A -- HTTPS (API) --> B
    B -- Read/Write --> C
    B -- Read/Write --> D
    B -- Enqueue Tasks --> E
    E -- Read/Write --> C
    E -- Read/Write --> D
    A -- Read/Write --> F
    B -- Read/Write --> F
    A -- Authenticates against --> H
    B -- Authenticates against --> H

    style A fill:#fbb,stroke:#333,stroke-width:2px
    style B fill:#fbb,stroke:#333,stroke-width:2px
    style C fill:#ccf,stroke:#333,stroke-width:2px
    style D fill:#ccf,stroke:#333,stroke-width:2px
    style E fill:#fbb,stroke:#333,stroke-width:2px
    style F fill:#ccf,stroke:#333,stroke-width:2px

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Container Diagram Elements:
- - Name: Web Application
  - Type: Container
  - Description: Django-based web application serving HTML content and handling user interactions through the browser interface.
  - Responsibilities:
    - Serve the addons.mozilla.org website.
    - Handle user authentication and session management.
    - Present add-on listings and details to users.
    - Manage user accounts and profiles.
    - Handle developer interactions through the web interface.
    - Interact with the API Server for data retrieval and updates.
    - Utilize caching for performance optimization.
  - Security controls:
    - security control: Web application security best practices (e.g., input validation, output encoding, session management).
    - security control: Authentication and authorization mechanisms integrated with Mozilla Accounts.
    - security control: CSRF protection.
    - security control: CSP and SRI headers.
    - security control: Rate limiting for web requests.
- - Name: API Server
  - Type: Container
  - Description: Django REST Framework based API server providing a programmatic interface for the Web Application and Firefox Browser.
  - Responsibilities:
    - Provide RESTful API endpoints for accessing and managing add-on data.
    - Handle API requests from the Web Application and Firefox Browser.
    - Enforce API authentication and authorization.
    - Interact with the Database and Storage containers for data persistence.
    - Delegate background tasks to Background Workers.
    - Utilize caching for API responses.
  - Security controls:
    - security control: API security best practices (e.g., input validation, output serialization, API authentication and authorization - OAuth 2.0 likely).
    - security control: Rate limiting for API requests.
    - security control: API documentation and security guidelines for developers.
    - security control: Protection against API-specific attacks (e.g., mass assignment, injection).
- - Name: Database
  - Type: Container
  - Description: PostgreSQL database storing application data, including add-on metadata, user information, and review data.
  - Responsibilities:
    - Persistently store application data.
    - Provide data access and retrieval for the API Server and Background Workers.
    - Ensure data integrity and consistency.
    - Manage database backups and recovery.
  - Security controls:
    - security control: Database access control and authentication.
    - security control: Data encryption at rest (if required).
    - security control: Regular database backups.
    - security control: Database security hardening and patching.
    - security control: Monitoring database activity for suspicious behavior.
- - Name: Storage
  - Type: Container
  - Description: Object storage (likely AWS S3 or similar) for storing add-on files, icons, and other static assets.
  - Responsibilities:
    - Store add-on files and assets.
    - Provide scalable and reliable storage.
    - Serve static assets to users and browsers.
  - Security controls:
    - security control: Access control policies for object storage (least privilege).
    - security control: Data encryption at rest and in transit.
    - security control: Integrity checks for stored files.
    - security control: Regular security audits of storage configurations.
- - Name: Background Workers
  - Type: Container
  - Description: Celery workers processing asynchronous tasks, such as add-on validation, indexing, and email notifications.
  - Responsibilities:
    - Execute background tasks offloaded from the API Server.
    - Perform add-on validation and scanning.
    - Index add-ons for search functionality.
    - Send email notifications.
    - Process data updates in the background.
  - Security controls:
    - security control: Secure task queue configuration and access control.
    - security control: Input validation for task parameters.
    - security control: Secure handling of sensitive data within background tasks.
    - security control: Monitoring background worker activity.
- - Name: Cache
  - Type: Container
  - Description: Redis or Memcached for caching frequently accessed data to improve performance and reduce database load.
  - Responsibilities:
    - Cache frequently accessed data (e.g., add-on metadata, API responses).
    - Improve application performance and responsiveness.
    - Reduce load on the database.
  - Security controls:
    - security control: Access control for the cache service.
    - security control: Secure configuration of the cache service.
    - security control: Consider data sensitivity when caching information.

DEPLOYMENT

Deployment Architecture Options:
- Option 1: Cloud-based deployment using AWS, GCP, or Azure. (Likely option for Mozilla)
- Option 2: On-premises deployment in Mozilla's data centers.
- Option 3: Hybrid deployment combining cloud and on-premises resources.
Detailed Deployment Architecture (Assuming Cloud-based - AWS):

flowchart LR
    subgraph AWS Cloud
        subgraph Region
            subgraph Availability Zone 1
                A["Load Balancer"]
                B["Web Application Instances"]
                C["API Server Instances"]
                D["Background Worker Instances"]
            end
            subgraph Availability Zone 2
                E["Web Application Instances"]
                F["API Server Instances"]
                G["Background Worker Instances"]
            end
            H["Database Cluster (PostgreSQL)"]
            I["Object Storage (S3)"]
            J["Cache Cluster (Redis/Memcached)"]
            K["Message Queue (SQS/RabbitMQ)"]
        end
    end
    L["Internet"]
    M["Firefox Browser"]
    N["Add-on Developers"]

    L -- HTTPS --> A
    M -- HTTPS --> A
    N -- HTTPS --> A
    A -- HTTPS --> B & E
    A -- HTTPS --> C & F
    K --> D & G
    B & E -- Database Connection --> H
    C & F -- Database Connection --> H
    D & G -- Database Connection --> H
    B & E -- Object Storage Access --> I
    C & F -- Object Storage Access --> I
    D & G -- Object Storage Access --> I
    B & E -- Cache Access --> J
    C & F -- Cache Access --> J
    D & G -- Cache Access --> J
    C & F -- Message Queue Access --> K

    style A fill:#beb,stroke:#333,stroke-width:2px
    style B fill:#eee,stroke:#333,stroke-width:1px
    style C fill:#eee,stroke:#333,stroke-width:1px
    style D fill:#eee,stroke:#333,stroke-width:1px
    style E fill:#eee,stroke:#333,stroke-width:1px
    style F fill:#eee,stroke:#333,stroke-width:1px
    style G fill:#eee,stroke:#333,stroke-width:1px
    style H fill:#ccf,stroke:#333,stroke-width:2px
    style I fill:#ccf,stroke:#333,stroke-width:2px
    style J fill:#ccf,stroke:#333,stroke-width:2px
    style K fill:#ccf,stroke:#333,stroke-width:2px

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Deployment Diagram Elements:
- - Name: Load Balancer
  - Type: Infrastructure
  - Description: Distributes incoming traffic across Web Application and API Server instances in multiple Availability Zones for high availability and scalability.
  - Responsibilities:
    - Load balancing of HTTP/HTTPS traffic.
    - SSL termination.
    - Health checks for backend instances.
  - Security controls:
    - security control: DDoS protection.
    - security control: WAF integration (optional, might be separate WAF).
    - security control: Access logs.
- - Name: Web Application Instances
  - Type: Infrastructure
  - Description: Multiple instances of the Django Web Application running in containers or virtual machines across Availability Zones.
  - Responsibilities:
    - Serve web application requests.
    - Run the Django application code.
  - Security controls:
    - security control: Instance security hardening.
    - security control: Security patching and updates.
    - security control: Network security groups/firewalls to restrict access.
- - Name: API Server Instances
  - Type: Infrastructure
  - Description: Multiple instances of the Django REST Framework API Server running in containers or virtual machines across Availability Zones.
  - Responsibilities:
    - Serve API requests.
    - Run the API server application code.
  - Security controls:
    - security control: Instance security hardening.
    - security control: Security patching and updates.
    - security control: Network security groups/firewalls to restrict access.
- - Name: Background Worker Instances
  - Type: Infrastructure
  - Description: Multiple instances of Celery workers running in containers or virtual machines across Availability Zones to process background tasks.
  - Responsibilities:
    - Execute background tasks from the message queue.
    - Run Celery worker processes.
  - Security controls:
    - security control: Instance security hardening.
    - security control: Security patching and updates.
    - security control: Network security groups/firewalls to restrict access.
- - Name: Database Cluster (PostgreSQL)
  - Type: Infrastructure
  - Description: Managed PostgreSQL database cluster for high availability and scalability.
  - Responsibilities:
    - Persistent data storage.
    - Database management and replication.
  - Security controls:
    - security control: Database access control lists (ACLs).
    - security control: Encryption at rest and in transit.
    - security control: Database monitoring and auditing.
    - security control: Automated backups.
- - Name: Object Storage (S3)
  - Type: Infrastructure
  - Description: AWS S3 or equivalent object storage service for storing add-on files and assets.
  - Responsibilities:
    - Scalable and durable object storage.
  - Security controls:
    - security control: Access control policies (IAM roles).
    - security control: Encryption at rest and in transit.
    - security control: Versioning and data retention policies.
- - Name: Cache Cluster (Redis/Memcached)
  - Type: Infrastructure
  - Description: Managed Redis or Memcached cluster for caching application data.
  - Responsibilities:
    - In-memory caching for performance improvement.
  - Security controls:
    - security control: Access control for cache service.
    - security control: Secure configuration.
- - Name: Message Queue (SQS/RabbitMQ)
  - Type: Infrastructure
  - Description: Message queue service for asynchronous task processing by background workers.
  - Responsibilities:
    - Reliable message queuing for background tasks.
  - Security controls:
    - security control: Access control for message queue.
    - security control: Encryption in transit (if supported by the queue service).

BUILD

flowchart LR
    A["Developer"] --> B{Code Changes};
    B -- Push Code --> C["GitHub Repository"];
    C --> D["GitHub Actions CI"];
    D -- Build & Test --> E["Build Artifacts"];
    E -- Security Scans (SAST, DAST, SCA) --> F{Security Scan Results};
    F -- Pass --> G["Container Registry"];
    F -- Fail --> H["Notification to Developer"];
    G -- Deploy --> I["Deployment Environment"];

    subgraph GitHub Actions CI
        D1["Checkout Code"]
        D2["Build Application"]
        D3["Run Unit Tests"]
        D4["Run Integration Tests"]
        D5["Run SAST"]
        D6["Run DAST"]
        D7["Run SCA"]
        D8["Publish Artifacts"]
        D --> D1 --> D2 --> D3 --> D4 --> D5 --> D6 --> D7 --> D8 --> E
    end

    style D fill:#beb,stroke:#333,stroke-width:2px
    style F fill:#ccf,stroke:#333,stroke-width:2px
    style G fill:#ccf,stroke:#333,stroke-width:2px

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Build Process Description:
- Developer makes code changes and pushes them to the GitHub repository.
- GitHub Actions CI pipeline is triggered on code push.
- CI pipeline stages:
  - Checkout Code: Retrieves the latest code from the repository.
  - Build Application: Compiles the application code and builds necessary artifacts.
  - Run Unit Tests: Executes unit tests to verify code functionality.
  - Run Integration Tests: Executes integration tests to verify component interactions.
  - Run SAST (Static Application Security Testing): Performs static code analysis to identify potential security vulnerabilities.
  - Run DAST (Dynamic Application Security Testing): Performs dynamic application security testing (if feasible in CI, might be more suitable for staging/pre-prod environments).
  - Run SCA (Software Composition Analysis): Scans dependencies for known vulnerabilities and license compliance issues.
  - Publish Artifacts: Builds container images or packages and pushes them to a container registry.
- Security Scan Results are evaluated:
  - If scans pass (no critical vulnerabilities found), build artifacts are pushed to the Container Registry.
  - If scans fail (critical vulnerabilities found), developers are notified, and the build process is stopped to prevent deployment of vulnerable code.
- Build Artifacts (e.g., container images) in the Container Registry are then used for deployment to the target environment.
Build Process Security Controls:
- security control: Automated build process using CI/CD pipeline (GitHub Actions).
- security control: Source code version control (GitHub).
- security control: Static Application Security Testing (SAST) integrated into the CI pipeline.
- security control: Dynamic Application Security Testing (DAST) integrated into the CI pipeline or pre-production environment.
- security control: Software Composition Analysis (SCA) for dependency vulnerability scanning.
- security control: Automated unit and integration tests.
- security control: Secure artifact storage in a container registry with access control.
- security control: Code review process before merging code changes (although not explicitly in build diagram, it's a crucial part of secure development).
- security control: Build pipeline security hardening (secure runner environment, secrets management).
- security control: Vulnerability scanning of base images used for container builds.

RISK ASSESSMENT

Critical Business Processes:
- Add-on Submission and Review: Ensuring only safe and policy-compliant add-ons are published.
- Add-on Distribution: Providing reliable and secure access to add-ons for Firefox users.
- User Account Management: Securely managing user accounts and authentication.
- Platform Availability: Maintaining the availability and performance of addons.mozilla.org.
Data to Protect and Sensitivity:
- User Data:
  - Sensitivity: High (Personally Identifiable Information - PII, browsing history potentially inferred from add-on usage).
  - Data includes: User profiles, account credentials, add-on installation history, potentially usage data.
- Add-on Code and Metadata:
  - Sensitivity: Medium (Intellectual Property, potential for malicious code injection).
  - Data includes: Add-on source code (submitted for review), add-on packages, add-on descriptions, icons, version information.
- Reviewer Data:
  - Sensitivity: Medium (Internal operational data, potential for process manipulation).
  - Data includes: Reviewer assignments, review decisions, review comments.
- Platform Logs and Monitoring Data:
  - Sensitivity: Low to Medium (Operational data, potential for security incident investigation).
  - Data includes: Application logs, access logs, security logs, performance metrics.

QUESTIONS & ASSUMPTIONS

Questions:
- What is the current maturity level of the security controls implemented in the addons-server project?
- Are there specific compliance requirements (e.g., GDPR, CCPA) that the project needs to adhere to?
- What is the process for add-on review and validation, and what security checks are performed during this process?
- What is the incident response plan for security incidents related to addons-server?
- What are the performance and scalability requirements for the platform?
Assumptions:
- BUSINESS POSTURE:
  - Security and user privacy are high priorities for the addons-server project, given Mozilla's mission and reputation.
  - Platform availability and reliability are critical for user experience and trust.
  - Supporting a vibrant add-on developer community is important for the platform's success.
- SECURITY POSTURE:
  - Mozilla follows secure software development lifecycle (SSDLC) practices.
  - Standard security controls like authentication, authorization, input validation, and encryption are implemented.
  - There is an ongoing effort to improve and maintain the security posture of the platform.
- DESIGN:
  - The system is designed for scalability and high availability, likely using a cloud-based infrastructure.
  - The architecture is component-based, separating concerns into web application, API server, database, storage, etc.
  - The build and deployment process is automated using CI/CD pipelines.

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sec-design.md

sec-design.md

BUSINESS POSTURE

SECURITY POSTURE

DESIGN

C4 CONTEXT

C4 CONTAINER

DEPLOYMENT

BUILD

RISK ASSESSMENT

QUESTIONS & ASSUMPTIONS

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BUSINESS POSTURE

SECURITY POSTURE

DESIGN

C4 CONTEXT

C4 CONTAINER

DEPLOYMENT

BUILD

RISK ASSESSMENT

QUESTIONS & ASSUMPTIONS