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BUSINESS POSTURE

  • Business Priorities and Goals:

    • The primary goal of Docuseal is to provide a secure, reliable, and user-friendly platform for digital document signing and management.
    • Business priorities include:
      • Ensuring the integrity and authenticity of signed documents.
      • Maintaining the confidentiality of document content and user data.
      • Providing a legally compliant digital signing solution.
      • Offering a scalable and performant service to meet user demands.
      • Achieving user adoption and market penetration in the digital signature space.

  • Business Risks:

    • Data breaches leading to exposure of sensitive document content or user information, resulting in financial loss, reputational damage, and legal liabilities.
    • Failure to comply with relevant digital signature regulations (e.g., eIDAS, ESIGN Act), leading to legal challenges and invalidity of signatures.
    • Service unavailability impacting business continuity and user trust.
    • Vulnerabilities in the platform being exploited to manipulate documents or signatures, undermining the integrity of the system.
    • Lack of user adoption due to poor user experience or lack of trust in the security of the platform.

SECURITY POSTURE

  • Existing Security Controls:

    • security control: HTTPS encryption for communication between users and the platform (implementation location: likely web server configuration).
    • security control: User authentication to access the platform (implementation location: application code, authentication service).
    • security control: Authorization mechanisms to control access to documents and functionalities based on user roles (implementation location: application code, authorization service).
    • security control: Input validation to prevent common web application vulnerabilities (implementation location: application code).
    • security control: Secure storage of documents (implementation location: database, object storage).
    • security control: Audit logging of user actions and system events (implementation location: application code, logging system).
    • accepted risk: Reliance on standard web application security practices without specific mention of advanced security tools or processes.
    • accepted risk: Level of security maturity is unknown without deeper code and infrastructure analysis.

  • Recommended Security Controls:

    • security control: Implement a Secure Software Development Lifecycle (SSDLC) incorporating security reviews, static and dynamic analysis, and penetration testing.
    • security control: Integrate automated security scanning tools (SAST, DAST, dependency scanning) into the CI/CD pipeline.
    • security control: Implement robust input validation and sanitization across all application layers.
    • security control: Implement rate limiting and защиты от бот-атак (bot protection) to prevent abuse and denial-of-service attacks.
    • security control: Regularly perform security audits and penetration testing by independent security experts.
    • security control: Implement a vulnerability management program to track, prioritize, and remediate security vulnerabilities.
    • security control: Consider implementing multi-factor authentication (MFA) for enhanced user account security.
    • security control: Implement data loss prevention (DLP) measures to protect sensitive document content.
    • security control: Implement security monitoring and alerting to detect and respond to security incidents.

  • Security Requirements:

    • Authentication:
      • requirement: Secure user authentication mechanism to verify user identity before granting access to the platform.
      • requirement: Support for strong password policies and password management.
      • requirement: Consider integration with existing Identity Providers (IdP) via protocols like SAML or OAuth 2.0 for enterprise users.
      • requirement: Implement session management to securely manage user sessions and prevent session hijacking.
    • Authorization:
      • requirement: Role-based access control (RBAC) to manage user permissions and access to documents and functionalities.
      • requirement: Granular authorization policies to control access at the document level.
      • requirement: Secure API authorization to protect backend services from unauthorized access.
    • Input Validation:
      • requirement: Comprehensive input validation on all user inputs to prevent injection attacks (e.g., SQL injection, XSS).
      • requirement: Validation of uploaded document formats and sizes to prevent malicious file uploads.
      • requirement: Sanitization of user-generated content to prevent stored XSS vulnerabilities.
    • Cryptography:
      • requirement: Use strong encryption algorithms for data at rest (documents, database) and data in transit (HTTPS).
      • requirement: Secure key management practices for encryption keys.
      • requirement: Implement digital signature algorithms to ensure document integrity and non-repudiation.
      • requirement: Use cryptographic hashing for password storage and data integrity checks.

DESIGN

C4 CONTEXT

flowchart LR
    subgraph "Docuseal Platform"
        D["Docuseal System"]
    end
    U1["Document Sender"] --> |Initiates Document Signing Process| D
    U2["Document Signer"] --> |Signs Documents| D
    A["Administrator"] --> |Manages System Configuration and Users| D
    ES["Email Service"] --> |Sends Notifications| D
    S["Document Storage"] --> |Stores Documents| D
    IDP["Identity Provider (Optional)"] --> |Authenticates Users| D

    classDef element stroke:#000,stroke-width:2px;
    class D,U1,U2,A,ES,S,IDP element
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  • Context Diagram Elements:
      • Name: Docuseal System
      • Type: Software System
      • Description: The Docuseal platform for digital document signing and management.
      • Responsibilities:
        • Facilitates document uploading and preparation for signing.
        • Manages the document signing workflow.
        • Provides secure document storage and retrieval.
        • Ensures document integrity and authenticity through digital signatures.
        • Manages user accounts and access control.
        • Generates audit logs of system activities.
      • Security controls:
        • Authentication and authorization to control access.
        • Input validation to prevent vulnerabilities.
        • Encryption of data at rest and in transit.
        • Audit logging for security monitoring and incident response.
        • Digital signature implementation for document integrity and non-repudiation.
      • Name: Document Sender
      • Type: User
      • Description: Users who initiate the document signing process by uploading and sending documents for signature.
      • Responsibilities:
        • Uploading documents to the Docuseal platform.
        • Specifying recipients and signing order.
        • Tracking the signing process.
        • Downloading signed documents.
      • Security controls:
        • User authentication to access the platform.
        • Authorization to manage their own documents and signing processes.
      • Name: Document Signer
      • Type: User
      • Description: Users who are invited to sign documents through the Docuseal platform.
      • Responsibilities:
        • Reviewing documents to be signed.
        • Applying digital signatures to documents.
        • Completing the signing process.
      • Security controls:
        • User authentication to access documents for signing.
        • Audit logging of signing actions.
      • Name: Administrator
      • Type: User
      • Description: Users responsible for managing the Docuseal platform, including user management, system configuration, and monitoring.
      • Responsibilities:
        • User account management (creation, deletion, role assignment).
        • System configuration and settings.
        • Monitoring system performance and security.
        • Audit log review and security incident response.
      • Security controls:
        • Strong authentication and authorization for administrative access.
        • Audit logging of administrative actions.
        • Access to security configuration and monitoring tools.
      • Name: Email Service
      • Type: External System
      • Description: An external email service used by Docuseal to send notifications to users, such as signing requests and completion confirmations.
      • Responsibilities:
        • Sending email notifications.
      • Security controls:
        • Secure communication with Docuseal platform (e.g., using SMTP over TLS).
        • Potentially SPF, DKIM, and DMARC configurations to enhance email security and prevent spoofing.
      • Name: Document Storage
      • Type: External System
      • Description: An external storage system used by Docuseal to store documents securely. This could be cloud storage (e.g., AWS S3, Azure Blob Storage) or on-premise storage.
      • Responsibilities:
        • Securely storing documents at rest.
        • Providing access to documents for the Docuseal platform.
        • Ensuring data durability and availability.
      • Security controls:
        • Encryption of data at rest.
        • Access control mechanisms to restrict access to documents.
        • Data backup and recovery procedures.
      • Name: Identity Provider (Optional)
      • Type: External System
      • Description: An optional external Identity Provider (IdP) that can be integrated with Docuseal for user authentication, especially in enterprise environments.
      • Responsibilities:
        • Authenticating users.
        • Providing user identity information to Docuseal.
      • Security controls:
        • Secure authentication protocols (e.g., SAML, OAuth 2.0).
        • Secure communication with Docuseal platform.
        • Management of user credentials and authentication policies.

C4 CONTAINER

flowchart LR
    subgraph "Docuseal Platform"
        WAF["Web Application Firewall (WAF)"]
        LB["Load Balancer"] --> WAF
        WA["Web Application Container"] --> API["API Container"]
        WA --> DB["Database Container"]
        API --> DB
        API --> DS["Document Storage Container"]
        LB --> WA
    end
    U1["Document Sender"] --> LB
    U2["Document Signer"] --> LB
    A["Administrator"] --> LB
    ES["Email Service"] <-- API
    S["Document Storage"] <-- DS
    IDP["Identity Provider (Optional)"] --> WA

    classDef element stroke:#000,stroke-width:2px;
    class WAF,LB,WA,API,DB,DS element
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  • Container Diagram Elements:
      • Name: Web Application Firewall (WAF)
      • Type: Infrastructure Component
      • Description: A Web Application Firewall to protect the Docuseal web application from common web attacks.
      • Responsibilities:
        • Filtering malicious traffic.
        • Protecting against OWASP Top 10 vulnerabilities.
        • Rate limiting and bot protection.
      • Security controls:
        • Web application attack signatures.
        • Custom security rules.
        • DDoS protection.
        • Logging and monitoring of security events.
      • Name: Load Balancer
      • Type: Infrastructure Component
      • Description: A load balancer to distribute incoming traffic across multiple instances of the Web Application Container for scalability and high availability.
      • Responsibilities:
        • Distributing traffic.
        • Health checks for application instances.
        • SSL termination.
      • Security controls:
        • SSL/TLS encryption for traffic termination.
        • Access control to management interface.
      • Name: Web Application Container
      • Type: Application Container
      • Description: Contains the front-end web application code, handling user interface, user interactions, and presentation logic. Likely built using a web framework (e.g., React, Angular, Vue.js).
      • Responsibilities:
        • Serving the user interface.
        • Handling user authentication and authorization.
        • Processing user requests and interacting with the API Container.
        • Rendering document views and signing interfaces.
      • Security controls:
        • Input validation and sanitization on the client-side.
        • Secure session management.
        • Protection against client-side vulnerabilities (e.g., XSS).
        • Integration with Identity Provider for authentication (if applicable).
      • Name: API Container
      • Type: Application Container
      • Description: Contains the backend API logic, handling business logic, data processing, and interactions with the database and document storage. Likely built using a backend framework (e.g., Node.js, Python/Django, Java/Spring).
      • Responsibilities:
        • Implementing core business logic for document signing workflows.
        • API endpoints for the Web Application Container.
        • Data validation and processing.
        • Interaction with the Database Container and Document Storage Container.
        • Sending email notifications via Email Service.
        • Digital signature generation and verification.
        • Audit logging.
      • Security controls:
        • API authentication and authorization.
        • Input validation and sanitization on the server-side.
        • Secure data handling and processing.
        • Protection against server-side vulnerabilities (e.g., SQL injection, command injection).
        • Rate limiting and API security best practices.
      • Name: Database Container
      • Type: Data Container
      • Description: Contains the database system used to store application data, such as user accounts, document metadata, audit logs, and system configuration. Likely a relational database (e.g., PostgreSQL, MySQL).
      • Responsibilities:
        • Persistent storage of application data.
        • Data integrity and consistency.
        • Data backups and recovery.
      • Security controls:
        • Database access control and authentication.
        • Encryption of data at rest (database encryption).
        • Regular database backups.
        • Database security hardening and patching.
      • Name: Document Storage Container
      • Type: Data Container
      • Description: An abstraction layer for interacting with the Document Storage system. This container manages the storage and retrieval of document files.
      • Responsibilities:
        • Storing and retrieving document files from the Document Storage system.
        • Managing document metadata related to storage.
        • Potentially handling encryption of documents before storage.
      • Security controls:
        • Secure communication with the Document Storage system.
        • Access control to document storage operations.
        • Encryption of documents before storage (if implemented in this container).

DEPLOYMENT

  • Deployment Architecture Options:

    • Option 1: Cloud-based deployment (AWS, Azure, GCP) using managed services (e.g., Kubernetes, serverless functions, managed database).
    • Option 2: On-premise deployment on virtual machines or bare metal servers.
    • Option 3: Hybrid deployment combining cloud and on-premise components.

  • Detailed Deployment Architecture (Cloud-based - AWS using ECS):

flowchart LR
    subgraph "AWS Cloud Environment"
        Internet --> ELB["Elastic Load Balancer"]
        ELB --> ECS["ECS Cluster"]
        subgraph "ECS Cluster"
            WA_Task["Web Application Task"]
            API_Task["API Task"]
            WA_Task & API_Task --> ECS_Service["ECS Service"]
        end
        ECS_Service --> RDS["RDS PostgreSQL"]
        ECS_Service --> S3["S3 Bucket"]
        ECS_Service --> SES["SES"]
        CloudWatch["CloudWatch"] -- Logging & Monitoring --> ECS_Service & RDS & ELB
    end

    classDef element stroke:#000,stroke-width:2px;
    class ELB,ECS,WA_Task,API_Task,ECS_Service,RDS,S3,SES,CloudWatch element
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  • Deployment Diagram Elements:
      • Name: Elastic Load Balancer (ELB)
      • Type: AWS Service
      • Description: AWS Elastic Load Balancer distributing traffic to ECS tasks.
      • Responsibilities:
        • Load balancing incoming traffic.
        • SSL termination.
        • Health checks for ECS tasks.
      • Security controls:
        • SSL/TLS encryption.
        • Security groups to control inbound and outbound traffic.
        • Integration with AWS WAF (optional, but recommended).
      • Name: ECS Cluster
      • Type: AWS Service
      • Description: AWS Elastic Container Service cluster hosting Docker containers for the Web Application and API.
      • Responsibilities:
        • Orchestrating and managing Docker containers.
        • Providing compute resources for containers.
        • Scaling container instances.
      • Security controls:
        • IAM roles for task execution and resource access.
        • Container image security scanning (if integrated into CI/CD).
        • Network isolation within the VPC.
      • Name: Web Application Task
      • Type: ECS Task
      • Description: ECS task running the Web Application Container.
      • Responsibilities:
        • Serving the web application.
      • Security controls:
        • Security controls inherited from Web Application Container.
        • Least privilege IAM role.
      • Name: API Task
      • Type: ECS Task
      • Description: ECS task running the API Container.
      • Responsibilities:
        • Serving the backend API.
      • Security controls:
        • Security controls inherited from API Container.
        • Least privilege IAM role.
      • Name: ECS Service
      • Type: ECS Service
      • Description: ECS service managing the desired number of Web Application and API tasks and ensuring their availability.
      • Responsibilities:
        • Maintaining desired task count.
        • Service discovery and load balancing within the ECS cluster.
      • Security controls:
        • Service configuration and scaling policies.
      • Name: RDS PostgreSQL
      • Type: AWS Service
      • Description: AWS Relational Database Service (RDS) running PostgreSQL for persistent data storage.
      • Responsibilities:
        • Managed database service.
        • Data persistence, backups, and recovery.
      • Security controls:
        • Database encryption at rest and in transit.
        • Database access control lists (ACLs).
        • Security groups to control database access.
        • Regular security patching by AWS.
      • Name: S3 Bucket
      • Type: AWS Service
      • Description: AWS Simple Storage Service (S3) bucket for storing document files.
      • Responsibilities:
        • Object storage for documents.
        • Scalable and durable storage.
      • Security controls:
        • S3 bucket encryption at rest.
        • Bucket policies and IAM roles for access control.
        • Private bucket access (not publicly accessible).
      • Name: SES
      • Type: AWS Service
      • Description: AWS Simple Email Service (SES) for sending email notifications.
      • Responsibilities:
        • Sending emails.
      • Security controls:
        • SMTP over TLS for secure email transmission.
        • IAM roles for access control.
        • DKIM/SPF/DMARC configuration for email security.
      • Name: CloudWatch
      • Type: AWS Service
      • Description: AWS CloudWatch for logging and monitoring application and infrastructure components.
      • Responsibilities:
        • Centralized logging.
        • Performance monitoring.
        • Security monitoring and alerting.
      • Security controls:
        • Access control to logs and monitoring data.
        • Encryption of logs at rest (optional, but recommended).

BUILD

flowchart LR
    Developer["Developer"] --> VCS["Version Control System (GitHub)"]
    VCS --> GH_Actions["GitHub Actions CI/CD"]
    subgraph "GitHub Actions CI/CD"
        Build["Build Stage"] --> Test["Test Stage"]
        Test --> Security_Scan["Security Scan Stage"]
        Security_Scan --> Publish["Publish Stage"]
    end
    Publish --> Artifact_Repo["Artifact Repository (e.g., Docker Hub, AWS ECR)"]

    classDef element stroke:#000,stroke-width:2px;
    class Developer,VCS,GH_Actions,Build,Test,Security_Scan,Publish,Artifact_Repo element
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  • Build Process:
    • Developer commits code changes to the Version Control System (GitHub).
    • GitHub Actions CI/CD pipeline is triggered on code changes (e.g., push, pull request).
    • Build Stage:
      • Compiles code, builds application containers (Docker images).
      • Performs unit tests and integration tests.
    • Test Stage:
      • Runs automated tests to verify functionality and performance.
    • Security Scan Stage:
      • Performs static application security testing (SAST) to identify code vulnerabilities.
      • Performs dependency scanning to identify vulnerable dependencies.
      • Performs container image scanning to identify vulnerabilities in base images and dependencies.
    • Publish Stage:
      • Builds are promoted to artifact repository (e.g., Docker Hub, AWS ECR).
      • Application artifacts are signed for integrity verification.
    • Artifact Repository:
      • Stores build artifacts (e.g., Docker images).
      • Provides versioning and access control for artifacts.
      • Artifacts are deployed from the artifact repository to the deployment environment.

RISK ASSESSMENT

  • Critical Business Processes:

    • Document Signing Process: Ensuring the secure and reliable execution of the document signing workflow, from document upload to final signature and storage.
    • User Management: Securely managing user accounts, roles, and permissions to control access to the platform and documents.
    • Audit Logging: Maintaining comprehensive and tamper-proof audit logs for security monitoring, compliance, and incident investigation.
    • Document Storage and Retrieval: Ensuring the confidentiality, integrity, and availability of stored documents.

  • Data Sensitivity:

    • Documents: Highly sensitive. Documents may contain confidential business information, personal data, and legally binding agreements. Confidentiality and integrity are critical.
    • User Data: Sensitive. User profiles, contact information, authentication credentials. Confidentiality and integrity are important for user privacy and security.
    • Audit Logs: Sensitive. Contain records of user actions and system events, important for security monitoring and compliance. Integrity is critical.

QUESTIONS & ASSUMPTIONS

  • Questions:

    • What are the specific regulatory compliance requirements for Docuseal (e.g., eIDAS, GDPR, HIPAA)?
    • What is the expected scale of users and document volume for the platform?
    • Are there any specific integrations with other systems planned beyond email and identity providers?
    • What is the current security maturity level and existing security documentation for the project?
    • What are the performance and availability requirements for the platform?
    • What is the budget and timeline for implementing security controls and improvements?

  • Assumptions:

    • Docuseal is intended to be a web-based platform accessible over the internet.
    • The platform will handle sensitive documents and user data, requiring a strong security posture.
    • The target deployment environment is a cloud environment (AWS, Azure, or similar).
    • Standard web application security best practices are intended to be followed.
    • The project aims to provide a legally compliant digital signature solution.
    • The development team has some level of security awareness and expertise, but may need guidance on specific security implementations.