langfuse-enterprise-rbac

Langfuse Enterprise RBAC

Overview

Configure enterprise access control for Langfuse: built-in roles and permissions, scoped API keys per service, SSO integration, project-level isolation, and audit logging for compliance.

Prerequisites

• Langfuse Cloud (Team/Enterprise plan) or self-hosted instance
• Organization admin access
• SSO provider (optional, for SAML/OIDC integration)

Langfuse Built-In Roles

Langfuse provides these roles at the project level:

Role	View Traces	Create Traces	Manage Prompts	Manage Members	Manage Billing
Owner	Yes	Yes	Yes	Yes	Yes
Admin	Yes	Yes	Yes	Yes	No
Member	Yes	Yes	Yes	No	No
Viewer	Yes	No	No	No	No

Instructions

Step 1: Organization and Project Structure

Organization: Acme Corp
├── Project: production-chatbot
│   ├── Owner: engineering-lead@acme.com
│   ├── Admin: senior-dev@acme.com
│   ├── Member: developer@acme.com
│   └── API Key: sk-lf-prod-chatbot-...
│
├── Project: staging-chatbot
│   ├── Admin: senior-dev@acme.com
│   ├── Member: developer@acme.com
│   └── API Key: sk-lf-staging-chatbot-...
│
└── Project: analytics-readonly
    ├── Admin: data-lead@acme.com
    ├── Viewer: analyst@acme.com
    └── API Key: sk-lf-analytics-...

Best practice: Separate projects for production, staging, and analytics. Never share API keys across environments.

Step 2: Scoped API Keys

Create API keys with specific purposes and rotate regularly:

// In Langfuse UI: Settings > API Keys > Create
// Each key pair (public + secret) is scoped to one project

// Service-specific keys
// Backend API:     pk-lf-prod-api-...  / sk-lf-prod-api-...
// CI/CD pipeline:  pk-lf-ci-...       / sk-lf-ci-...
// Analytics:       pk-lf-analytics-... / sk-lf-analytics-...

// Validate key scope at startup
function validateApiKeyScope(expectedProject: string) {
  const pk = process.env.LANGFUSE_PUBLIC_KEY || "";

  if (!pk.includes(expectedProject)) {
    console.warn(
      `WARNING: API key may not match expected project: ${expectedProject}`
    );
  }
}

// Key rotation script
async function rotateApiKeys() {
  // 1. Create new key pair in Langfuse UI
  // 2. Deploy new keys to secret manager
  // 3. Wait for all instances to pick up new keys
  // 4. Revoke old key pair in Langfuse UI

  console.log("Key rotation checklist:");
  console.log("1. [ ] New key pair created in Langfuse");
  console.log("2. [ ] New keys deployed to secret manager");
  console.log("3. [ ] All services restarted with new keys");
  console.log("4. [ ] Old key pair revoked in Langfuse");
  console.log("5. [ ] Verified traces flowing with new keys");
}

Step 3: Self-Hosted Access Control

# docker-compose.yml -- enterprise hardening
services:
  langfuse:
    image: langfuse/langfuse:latest
    environment:
      # Disable public registration
      - AUTH_DISABLE_SIGNUP=true

      # SSO enforcement for your domain
      - AUTH_DOMAINS_WITH_SSO_ENFORCEMENT=acme.com

      # Default role for new project members
      - LANGFUSE_DEFAULT_PROJECT_ROLE=VIEWER

      # Encrypt data at rest
      - ENCRYPTION_KEY=${ENCRYPTION_KEY}

      # Session security
      - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}

Step 4: SSO Integration

SAML Setup (Okta, Azure AD, OneLogin):

1. In your IdP, create a new SAML application for Langfuse
2. Configure the SSO callback URL: https://langfuse.your-domain.com/api/auth/callback/saml
3. Set the entity ID: https://langfuse.your-domain.com
4. Map IdP groups to Langfuse roles:

# Self-hosted SSO configuration
services:
  langfuse:
    environment:
      - AUTH_CUSTOM_CLIENT_ID=${SAML_CLIENT_ID}
      - AUTH_CUSTOM_CLIENT_SECRET=${SAML_CLIENT_SECRET}
      - AUTH_CUSTOM_ISSUER=https://your-idp.com/saml
      - AUTH_DOMAINS_WITH_SSO_ENFORCEMENT=acme.com

Step 5: Audit Logging

Track access and permission changes for compliance:

// Application-level audit logging for Langfuse operations
import { LangfuseClient } from "@langfuse/client";

interface AuditEvent {
  timestamp: string;
  actor: string;
  action: string;
  resource: string;
  details: Record<string, any>;
}

const auditLog: AuditEvent[] = [];

function logAuditEvent(event: Omit<AuditEvent, "timestamp">) {
  const entry: AuditEvent = {
    ...event,
    timestamp: new Date().toISOString(),
  };
  auditLog.push(entry);
  console.log(`[AUDIT] ${entry.action}: ${entry.resource} by ${entry.actor}`);

  // In production: send to your SIEM or audit log service
  // await sendToSIEM(entry);
}

// Audit Langfuse API key usage
function auditedLangfuseClient(actor: string): LangfuseClient {
  const client = new LangfuseClient();

  // Log score creation
  const originalScoreCreate = client.score.create.bind(client.score);
  client.score.create = async (params) => {
    logAuditEvent({
      actor,
      action: "score.create",
      resource: `trace:${params.traceId}`,
      details: { scoreName: params.name },
    });
    return originalScoreCreate(params);
  };

  return client;
}

Access Control Checklist

Category	Requirement	Implementation
Authentication	SSO enforced for org domain	AUTH_DOMAINS_WITH_SSO_ENFORCEMENT
Registration	Public signup disabled	AUTH_DISABLE_SIGNUP=true
Default role	Least privilege	LANGFUSE_DEFAULT_PROJECT_ROLE=VIEWER
API keys	Per-service, per-environment	Separate keys in secret manager
Key rotation	Quarterly or on compromise	Documented rotation procedure
Data encryption	At-rest encryption	ENCRYPTION_KEY configured
Audit trail	All access logged	Application-level audit logging

Error Handling

Issue	Cause	Solution
Permission denied	Insufficient role	Request role upgrade from project owner
SSO login fails	Wrong callback URL	Verify SAML callback URL matches
API key rejected	Wrong project or revoked	Create new key pair for correct project
New user gets no access	Not added to project	Admin must invite to specific project

Resources

• Langfuse Access Control
• Self-Hosting Configuration
• Headless Initialization