ARAL Security

Version: 1.0
Status: Release Candidate
Requirements: 60

The ARAL Security specification defines security requirements, threat models, and protection mechanisms across all layers.

1. Threat Model

ARAL uses STRIDE for threat modeling per layer.

1.1 Threat Matrix

Layer	S	T	R	I	D	E
L7 Protocol	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
L6 Orchestration	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
L5 Persona	⚠️	⚠️	✓	⚠️	⚠️	⚠️
L4 Reasoning	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
L3 Capabilities	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
L2 Memory	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️
L1 Runtime	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️

Legend: S=Spoofing, T=Tampering, R=Repudiation, I=Info Disclosure, D=DoS, E=Elevation

2. Authentication & Authorization

2.1 Requirements

ID	Requirement	Level
ARAL-S-001	All external requests MUST be authenticated	MUST
ARAL-S-002	Authentication MUST support OAuth 2.0 / OIDC	MUST
ARAL-S-003	Authentication SHOULD support mTLS	SHOULD
ARAL-S-004	Authorization MUST be capability-based	MUST
ARAL-S-005	Authorization MUST follow least privilege	MUST
ARAL-S-006	Tokens MUST have bounded lifetime	MUST
ARAL-S-007	Token refresh MUST NOT extend beyond max lifetime	MUST
ARAL-S-008	Failed auth attempts MUST be logged	MUST
ARAL-S-009	Auth SHOULD implement rate limiting	SHOULD
ARAL-S-010	Service-to-service auth MUST use SPIFFE/mTLS	MUST

3. Data Protection

3.1 Requirements

ID	Requirement	Level
ARAL-S-020	Data in transit MUST use TLS 1.3+	MUST
ARAL-S-021	Data at rest SHOULD be encrypted	SHOULD
ARAL-S-022	PII MUST be identified and protected	MUST
ARAL-S-023	Sensitive data MUST NOT appear in logs	MUST
ARAL-S-024	Data retention MUST follow defined policies	MUST
ARAL-S-025	Data deletion MUST be verifiable	MUST
ARAL-S-026	Encryption keys MUST be rotated periodically	MUST
ARAL-S-027	Key management SHOULD use HSM or KMS	SHOULD
ARAL-S-028	Data classification MUST be documented	MUST
ARAL-S-029	Cross-border data transfer MUST be compliant	MUST

4. Persona Security

4.1 Requirements

ID	Requirement	Level
ARAL-S-030	Persona MUST be validated at startup	MUST
ARAL-S-031	Persona MUST be immutable at runtime	MUST
ARAL-S-032	Persona changes MUST require restart	MUST
ARAL-S-033	Persona SHOULD be cryptographically signed	SHOULD
ARAL-S-034	Persona signature SHOULD use Ed25519 or ECDSA	SHOULD
ARAL-S-035	Invalid persona MUST prevent agent startup	MUST
ARAL-S-036	Persona constraints MUST be enforced by L6	MUST
ARAL-S-037	Persona override attempts MUST be logged	MUST
ARAL-S-038	Persona version MUST be checked for compatibility	MUST
ARAL-S-039	Persona MUST NOT grant more than declared	MUST

5. Capability Security

5.1 Requirements

ID	Requirement	Level
ARAL-S-050	Capabilities MUST declare required permissions	MUST
ARAL-S-051	Capability invocation MUST check permissions	MUST
ARAL-S-052	Capabilities MUST validate all inputs	MUST
ARAL-S-053	Capabilities MUST NOT exceed declared scope	MUST
ARAL-S-054	Dangerous capabilities MUST require confirmation	MUST
ARAL-S-055	Capability errors MUST NOT leak internals	MUST
ARAL-S-056	Capabilities SHOULD implement sandboxing	SHOULD
ARAL-S-057	External capabilities MUST use allowlist	MUST
ARAL-S-058	Capability results MUST be validated	MUST
ARAL-S-059	Capability timeouts MUST be enforced	MUST

6. Secret Management

6.1 Requirements

ID	Requirement	Level
ARAL-S-080	Secrets MUST be stored via vault references	MUST
ARAL-S-081	Secrets MUST NOT be in code or config files	MUST
ARAL-S-082	Secret access MUST be audited	MUST
ARAL-S-083	Secrets MUST be rotated periodically	MUST
ARAL-S-084	Secret exposure MUST trigger rotation	MUST

6.2 Vault Reference Format

{
  "secret_ref": {
    "vault": "hashicorp-vault",
    "path": "secret/aral/api-key",
    "version": "latest"
  }
}

7. Audit Logging

7.1 Requirements

ID	Requirement	Level
ARAL-S-090	All security events MUST be logged	MUST
ARAL-S-091	Logs MUST use structured JSON format	MUST
ARAL-S-092	Logs MUST include trace_id	MUST
ARAL-S-093	Logs MUST be tamper-evident	MUST
ARAL-S-094	Logs MUST be retained per policy	MUST
ARAL-S-095	Log access MUST be restricted	MUST

7.2 Log Format

{
  "timestamp": "ISO8601",
  "level": "INFO|WARN|ERROR",
  "trace_id": "uuid",
  "event": "event_type",
  "actor": "agent_id or user_id",
  "action": "action_performed",
  "resource": "affected_resource",
  "outcome": "success|failure",
  "metadata": {...}
}

Summary

Category	Requirements
Authentication & Authorization	10
Data Protection	10
Persona Security	10
Capability Security	10
Secret Management	5
Audit Logging	6
Total ARAL-SECURITY	60 (+ 9 implicit)