# Authentication & Authorization Specification

## Overview

Authentication and authorization system for user access and API access.

## User Authentication Flows

### Authentication Methods

**1. Email/Password**:
- Registration with email
- Password hashing (bcrypt/argon2)
- Email verification

**2. OAuth**:
- Google, GitHub, etc.
- OAuth 2.0 flow
- Token-based authentication

**3. Wallet Authentication**:
- Signature-based authentication
- Prove ownership of address

### Session Management

**Storage**: HTTP-only cookies or JWT tokens
**Expiration**: Configurable (default: 24 hours)
**Refresh**: Refresh tokens for extended sessions

## API Key Management

### Key Generation

**Format**: Secure random tokens
**Storage**: Hashed (not plaintext)
**Metadata**: Name, tier, permissions, expiration

### Key Usage

**Authentication**: Via `X-API-Key` header
**Rate Limiting**: Based on key tier
**Revocation**: Support key revocation

## RBAC (Role-Based Access Control)

### Roles

**Public**: Unauthenticated users
**User**: Authenticated users
**Pro**: Paid tier users
**Admin**: Platform administrators
**Compliance**: Compliance officers

### Permissions

**Read**: View data
**Write**: Create/update data
**Admin**: Full access
**Compliance**: Compliance-specific access

## OAuth Integration

### OAuth Providers

- Google
- GitHub
- Others as needed

### OAuth Flow

1. User initiates OAuth login
2. Redirect to provider
3. User authorizes
4. Callback with code
5. Exchange code for tokens
6. Create/login user account
7. Establish session

## Session Management

### Session Storage

**Options**: 
- Server-side sessions (Redis)
- JWT tokens (stateless)

**Recommendation**: Server-side sessions for better security

### Session Security

- Secure cookies (HTTPS only)
- HttpOnly flag
- SameSite attribute
- CSRF protection

## References

- Security Architecture: See `security-architecture.md`