Permissions & Authorization Guide

This skill helps you work with Lightdash’s CASL-based permissions system, including scopes, custom roles, and authorization enforcement.

What do you need help with?

1. Add a new scope/permission – Step-by-step guide to add a new permission
2. Debug a permission issue – Troubleshoot why a user can’t access something
3. Understand the permission flow – Learn how permissions work end-to-end
4. Work with custom roles – Create or modify custom roles with specific scopes

Quick Reference

Key Files

Common Patterns

Backend permission check:

import { subject } from '@casl/ability';
import { ForbiddenError } from '@lightdash/common';

if (user.ability.cannot('manage', subject('Dashboard', { projectUuid }))) {
    throw new ForbiddenError('You do not have permission');
}

Frontend permission check:

const { user } = useUser();

if (user?.ability.can('manage', 'Dashboard')) {
    return <EditButton />;
}

or wrap in a CASL component:

import { Can } from '../../providers/Ability';

<Can I="manage" a="Dashboard">
    <EditButton />
</Can>

Full Documentation

For comprehensive documentation, read: .context/PERMISSIONS.md

This includes:

• Architecture diagram showing the complete permission flow
• All scope groups and modifiers (@self, @public, @space, etc.)
• Database schema for custom roles
• Step-by-step guide to add new scopes
• Troubleshooting guide

Adding a New Scope (Quick Guide)

1. Define scope in packages/common/src/authorization/scopes.ts:

{
    name: 'manage:NewFeature',
    description: 'Description for custom role UI',
    isEnterprise: false,
    group: ScopeGroup.PROJECT_MANAGEMENT,
    getConditions: (context) => [addUuidCondition(context)],
}

2. Add subject (if new) in packages/common/src/authorization/types.ts

3. Add to system role in packages/common/src/authorization/roleToScopeMapping.ts

4. Update ability builder in packages/common/src/authorization/projectMemberAbility.ts

5. Enforce in service with user.ability.cannot() check

6. Add frontend check with user?.ability.can()

Debugging Permission Issues

When a user gets “ForbiddenError”:

1. Check scope exists – Is the scope defined in scopes.ts?
2. Check role assignment – Does the user’s role include this scope?
3. Check conditions – Do the CASL conditions match the resource?
4. Check enterprise flag – Is isEnterprise: true but deployment isn’t enterprise?
5. Check subject name – Case-sensitive match in CaslSubjectNames?

Use grep to find where the permission is checked:

grep -r "ability.cannot.*'manage'.*'YourSubject'" packages/backend/src/services/

Please describe what you’re trying to accomplish, or ask me to explain any aspect of the permissions system.