Authentication and authorization best practices

Follow these security best practices to protect your GitLab instance and maintain proper access controls. These recommendations help you maintain secure access without limiting productivity across your organization.

Security principles

Establish fundamental security principles that form the foundation of your access control strategy.

Principle of least privilege

This principle reduces security risks by limiting potential damage from compromised accounts or insider threats.

• Grant users the minimum permissions necessary to complete their work.
• Assign minimum roles (Minimal Access or Guest) at the top-level group, then grant higher permissions only in specific subgroups and projects where needed.
• Minimize the number of Owners and Maintainers by implementing custom roles that restrict access to sensitive settings.
• When creating tokens, use the most limited scope possible or create multiple tokens with different scopes for specific purposes.

Hierarchical permission management

Organize permissions to match your organizational structure and reduce administrative overhead.

• Apply group membership permissions rather than project membership permissions when possible to reduce administrative overhead.
• Create a single top-level group for your organization to enable centralized access control and reporting.
• Organize your group hierarchy to match your organizational structure with clear ownership boundaries.

Defense in depth

Layer multiple security controls to protect against various types of attacks and failures. If one control fails, others provide backup protection.

• Set up protected branches for critical applications to prevent unauthorized changes.
• Configure protected environments to restrict deployments to specific roles or users.
• Use protected containers to add extra security for sensitive artifacts.

Authentication and credentials

Implement strong authentication methods to prevent unauthorized access to your GitLab instance.

Password security

Passwords remain a primary authentication method despite their limitations. Strong password policies reduce the risk of credential-based attacks by requiring strong passwords that meet your organization's security standards.

• Configure password complexity requirements appropriate for your organization.
• Enable compromised password detection to prevent the use of known compromised passwords.

Two-factor authentication

Two-factor authentication (2FA) significantly improves security by requiring a second form of verification. Even if passwords are compromised, 2FA prevents unauthorized access.

• Require two-factor authentication for all users, especially those with elevated permissions.
• Provide clear documentation and support for 2FA setup to ensure user adoption.
• Implement backup recovery methods to prevent account lockouts.

Token-based authentication

Tokens provide secure, programmatic access to GitLab resources. Different token types serve different purposes and have varying security implications.

• Rotate personal access tokens regularly and before they expire.
• Use group access tokens and project access tokens instead of personal tokens for automated processes.
• Store tokens securely and never commit them to repositories.

SSH key authentication

SSH keys provide secure, passwordless access to Git repositories. Proper key management is essential for maintaining security.

• Use strong SSH key algorithms (at minimum, RSA 2048-bit or Ed25519).
• Configure SSH key restrictions to enforce security standards.
• Regularly audit and rotate SSH keys, especially for service accounts.

Access management

Control who can access what resources and monitor those permissions over time. Effective access management balances security requirements with operational efficiency.

User type management

Different user types require different access levels based on their relationship to your organization and security requirements. Properly classifying users helps enforce appropriate access boundaries.

• Designate contractors and third parties as external users to automatically restrict their visibility to internal projects.
• Assign the Guest role to external collaborators who need limited interaction with repositories.
• Use auditor users for compliance and security personnel who need read-only access across the instance.

Regular access reviews

Periodic access reviews ensure user permissions remain appropriate as roles and responsibilities change over time. Regular reviews help identify and remediate inappropriate access before it becomes a security risk.

• Conduct regular access reviews to validate user permissions and resolve discrepancies immediately.
• Use user export and group export features to generate comprehensive access reports.
• Remove access immediately when users leave the organization or change roles.

Access monitoring and auditing

Continuous monitoring of access patterns and permission changes helps detect security incidents and maintain compliance. Audit trails provide visibility into who accessed what resources and when.

• Configure audit event streaming to a SIEM tool for real-time security monitoring.
• Review credentials inventory regularly to identify unused or overprivileged tokens.
• Monitor for unauthorized access changes or privilege escalations.

Organizational scaling

Different organizational sizes and structures require different approaches to permission management. Adapt your access control practices to stay secure as you grow.

Foundation level (1-50 users)

Focus on establishing good foundations without complex processes that could impede productivity.

• Start with default roles and assign permissions at the group level instead of per project.
• Document your permission decisions and rationale for future reference.
• Train your core team on the GitLab permission model and security practices.
• Establish group-level CI/CD configuration to enforce consistent security practices.

Growth level (50-200 users)

Balance security requirements with the need for scalable processes.

• Integrate LDAP or SAML with user groups to simplify management.
• Create separate subgroups for shared resources and sensitive resources to control access.
• Develop formal onboarding and offboarding processes for team members.
• Minimize deeply nested group structures (limit to 4-5 levels for most organizations).

Enterprise level (200+ users)

Implement enterprise-grade controls and governance processes.

• Develop custom roles for unique access needs while reducing the number of highly privileged users.
• Automate bulk access operations using GitLab APIs to reduce manual provisioning overhead.
• Establish governance processes for permission changes to prevent business disruption.
• Implement time-bound access for privileged roles and compliance frameworks for separation of duties.

Repository and CI/CD security

Protect your code, deployments, and automated processes from unauthorized changes and access. These controls ensure the integrity of your software development and delivery pipeline.

Pipeline security

CI/CD pipelines often have elevated privileges to deploy applications and access sensitive resources. Securing pipeline execution prevents unauthorized actions and protects your deployment process.

• Use job permissions to control what resources are accessible during pipeline execution.
• Configure approval gates for critical deployment stages.
• Use environment-specific runners or runner tags to isolate deployments and limit access to sensitive production resources.

Repository protection

Source code repositories contain your organization's intellectual property and need protection from unauthorized changes. Repository security controls ensure code integrity and prevent malicious modifications.

• Implement push rules to enforce commit standards and prevent sensitive data exposure.
• Require code review through approval rules before merging changes to protected branches.
• Use signed commits to provide cryptographic verification of commit authenticity.

API and automation security

Automated processes and API integrations often use long-lived credentials with broad access. These non-human access patterns require special security considerations to prevent credential abuse.

• Use service accounts with limited permissions for automated processes rather than personal tokens.
• Regularly rotate credentials used in automation and CI/CD pipelines.
• Monitor automated access patterns for unusual behavior or privilege escalation attempts.
• Use the most specific scopes possible when creating tokens for API access.
• Implement error handling and logging for API integrations.
• Rate limit API requests to prevent abuse and ensure system stability.