Security
Security Considerations
Authentication and Authorization
API Key Management
- API keys MUST be stored securely and never logged
- Keys SHOULD use environment variables or secure key management systems
- Key rotation MUST be supported without flow modification
- Expired or invalid keys MUST trigger authentication errors
Access Control
| Control Level | Purpose | Implementation | Audit Requirements |
|---|---|---|---|
| Flow-Level | Control flow execution access | Role-based permissions | Log execution attempts |
| Provider-Level | Restrict external service access | API key scoping | Log provider calls |
| Resource-Level | Limit file/system access | Path allowlists | Log resource access |
| Audit Logging | Track security operations | Structured logging | Immutable audit trail |
Data Security
Variable Security
- Sensitive variables MUST be marked as confidential
- Confidential variables MUST NOT appear in logs or debug output
- Variable values SHOULD be encrypted in transit and at rest
- Variable scoping MUST prevent unauthorized access
Provider Communication
- All provider communications MUST use TLS/HTTPS
- Credentials MUST be transmitted securely
- Request/response data MAY be encrypted based on sensitivity
- Provider endpoints SHOULD be validated and allowlisted
Input Validation
Sanitization Requirements
| Input Type | Validation | Security Concern | Mitigation |
|---|---|---|---|
| Variable Values | Type, format, range validation | Data integrity | Schema enforcement |
| File Paths | Path traversal prevention | Directory escape | Path canonicalization |
| URLs | Protocol, domain validation | SSRF attacks | Allowlist validation |
| Template Strings | Injection prevention | Code injection | Safe templating engine |
Content Security
- User-provided content MUST be sanitized before processing
- File uploads MUST be scanned for malicious content
- External URLs MUST be validated before access
- Generated content SHOULD be filtered for harmful output