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Authentication Architecture

Complete authentication system using Ory Stack

Overview​

Synap uses the Ory Stack for authentication:

  • Ory Kratos: Identity management (users, sessions)
  • Ory Hydra: OAuth2 server (API access, token exchange)

Architecture​

User Authentication (Kratos)​

Flow​

  1. User logs in via Kratos UI
  2. Kratos creates session
  3. Client stores session cookie
  4. API validates session with Kratos

Implementation​

// packages/auth/src/ory-kratos.ts
import { kratosPublic } from './ory-kratos.js';

export async function getSession(headers: Headers): Promise<Session | null> {
  const cookie = headers.get('cookie');
  if (!cookie) return null;
  
  const { data } = await kratosPublic.toSession({
    cookie,
  });
  
  return data;
}

API Key Authentication​

For Programmatic Access​

// Create API key
POST /trpc/apiKeys.create
{
  "name": "My API Key",
  "scopes": ["read:notes", "write:notes"]
}

// Use API key
GET /trpc/notes.list
Authorization: Bearer synap_xxx...

OAuth2 (Hydra)​

Client Credentials Flow​

For service-to-service authentication:

// External service requests token
POST /oauth2/token
{
  "grant_type": "client_credentials",
  "client_id": "service-id",
  "client_secret": "service-secret"
}

// Use token
GET /trpc/notes.list
Authorization: Bearer oauth2-token

Token Exchange (RFC 8693)​

For interoperability with other auth systems:

POST /auth/token-exchange
{
  "subject_token": "external-token",
  "subject_token_type": "urn:ietf:params:oauth:token-type:access_token",
  "audience": "synap-api"
}

Best Practices​

  1. Use HTTPS - Always in production
  2. Secure cookies - HttpOnly, Secure, SameSite
  3. Token expiration - Short-lived tokens
  4. Rate limiting - Prevent brute force
  5. Audit logging - Log all auth events

Next: See Data Confidentiality for privacy details.