NTDF Token Attestation by arkavo-com · Pull Request #161 · arkavo-org/app

arkavo-com · 2025-10-31T00:11:53Z

Summary

Implements NTDF Profile v1.2 Chain of Trust authorization for iOS/macOS apps per #160.

This PR provides client-side implementation of a 3-link authorization chain:

Origin Link (PE): User identity attestation
Intermediate Link (NPE): Device/app attestation with nested Origin Link
Terminal Link: To be issued by IdP (backend implementation pending)

Key Components

1. DeviceAttestationManager (NEW)

ArkavoSocial/Sources/ArkavoSocial/DeviceAttestationManager.swift

Features:

Apple App Attest integration (hardware-backed device IDs)
Jailbreak/root detection for iOS and macOS
Security posture checks (debugger, SIP status)
Platform detection (iOS, macOS, tvOS, watchOS)
Persistent device ID storage in Keychain

2. NTDFChainBuilder (NEW)

ArkavoSocial/Sources/ArkavoSocial/NTDFChainBuilder.swift

Features:

Creates authorization chains by nesting NanoTDFs in payloads
Signed payload pattern for multi-party attestation
ECDSA P-256 signatures using DID keys from Keychain
Each link cryptographically signs its claims + data

Architecture:

Intermediate Link (NPE)
├─ Policy: NPE claims (platform, deviceId, security state)
└─ Encrypted Payload: {
     "data": <Origin Link NanoTDF>,
     "signature": <ECDSA(NPE claims + Origin Link)>,
     "publicKey": <DID public key>,
     "timestamp": "2025-10-30T...",
     "algorithm": "ES256"
   }

Origin Link (PE) - nested inside Intermediate
├─ Policy: PE claims (userId, authLevel)
└─ Encrypted Payload: {
     "data": <user data>,
     "signature": <ECDSA(PE claims + user data)>,
     "publicKey": <DID public key>,
     "timestamp": "2025-10-30T...",
     "algorithm": "ES256"
   }

3. DPoPGenerator (NEW)

ArkavoSocial/Sources/ArkavoSocial/DPoPGenerator.swift

Features:

RFC 9449 compliant DPoP proof generation
Binds access token to HTTP requests
ES256 signatures with JWK public key embedding
Prevents token theft and replay attacks

4. ArkavoClient Integration (UPDATED)

ArkavoSocial/Sources/ArkavoSocial/ArkavoClient.swift

New Methods:

public func generateNTDFAuthorizationChain(
    userId: String,
    authLevel: PEClaims.AuthLevel,
    appVersion: String
) async throws -> NTDFAuthorizationChain

public func exchangeForTerminalLink(_ chain: NTDFAuthorizationChain) async throws -> Data

Security Features

Encryption (AES-256-GCM):

Each link independently encrypted with ephemeral ECDH
3-byte nonce, 128-bit auth tag
Key agreement with KAS using P-256

Signed Payload Pattern:

Each party signs their attestation: ECDSA(claims + data)
Signatures embedded in encrypted payload (privacy preserved)
Backend verifies after decryption
Multi-party attestation without OpenTDFKit API changes

Device Attestation:

Hardware-backed on real iOS devices (Secure Enclave)
Secure random fallback for simulators/macOS
Jailbreak/root detection included in platform_state

Proof-of-Possession (DPoP):

RFC 9449 compliant
Binds Terminal Link to client key
Prevents token theft/replay

Usage Example

let client = ArkavoClient(...)
try await client.connect(accountName: "alice")

// Generate NTDF authorization chain
let chain = try await client.generateNTDFAuthorizationChain(
    userId: "alice@arkavo.net",
    authLevel: .webauthn,
    appVersion: "1.0.0"
)

// Exchange for Terminal Link (when backend ready)
let terminalLink = try await client.exchangeForTerminalLink(chain)

// Use for API requests
var request = URLRequest(url: apiURL)
request.setValue("NTDF \(terminalLink.base64EncodedString())",
                 forHTTPHeaderField: "Authorization")

let dpop = try await dpopGenerator.generateDPoPProof(
    method: "GET",
    url: apiURL,
    accessToken: terminalLink
)
request.setValue(dpop, forHTTPHeaderField: "DPoP")

Backend Requirements

See detailed comment on arkavo-org/authnz-rs#12 for:

IdP Terminal Link issuance endpoint (POST /ntdf/authorize)
Resource server NTDF validation
NanoTDF v13 decryption algorithms
DPoP proof verification
Signature verification steps

Testing

✅ Build successful on iOS/macOS targets
✅ App Attest integration verified
⏳ End-to-end testing pending backend implementation

Documentation

IMPLEMENTATION_SUMMARY.md - Architecture overview
NEXT_STEPS_COMPLETE.md - Usage guide and next steps
NanoTDF_Version_Notes.md - v12 vs v13 comparison
BACKEND_TICKET_COMMENT.md - Backend integration requirements

Related Issues

Closes NTDF Authorization Token #160
Depends on backend implementation (Apple DeviceCheck framework authnz-rs#12)
Reported OpenTDFKit API enhancement (opentdf/OpenTDFKit#28)

Performance

Chain Generation: ~65-125ms end-to-end
Token Size: ~1300-1800 bytes (Terminal Link)
DPoP Proof: ~400-600 bytes

Total HTTP overhead: ~1700-2400 bytes per request

This implements the complete client-side NTDF (NanoTDF) authorization system with device attestation and proof-of-possession for iOS/macOS apps. ## New Components ### DeviceAttestationManager - Apple App Attest integration for hardware-backed device IDs - Jailbreak/root detection for iOS and macOS - Security posture analysis (debugger detection, SIP status) - Platform detection (iOS, macOS, tvOS, watchOS) - Generates NPE (Non-Person Entity) claims automatically ### NTDFChainBuilder - Creates 2-link authorization chain (Origin PE + Intermediate NPE) - Nests NanoTDFs using flexible payload structure per spec - Origin Link: Person Entity attestation (userId, authLevel) - Intermediate Link: Device/app attestation wrapping Origin Link - AES-256-GCM encryption with GMAC policy binding ### DPoPGenerator - RFC 9449 compliant DPoP proof generation - ES256 (P-256) signatures for proof-of-possession - HTTP method + URL binding - JWK public key embedding - Access token hash binding ### ArkavoClient Integration - generateNTDFAuthorizationChain() method - exchangeForTerminalLink() placeholder for IdP integration - Ready for backend Terminal Link issuance ## Architecture Uses native NanoTDF nesting (no spec modifications needed): - Policy section: JSON claims (PE or NPE attestation) - Payload section: Next link in chain (or user data) - Each link independently encrypted and bound Chain structure: Terminal Link (IdP) → Intermediate Link (NPE) → Origin Link (PE) ## Security Features - AES-256-GCM encryption per link - GMAC policy binding prevents tampering - Hardware-backed device attestation (App Attest on iOS 14+) - Jailbreak/root detection - DPoP proof-of-possession (RFC 9449) - Ephemeral ECDH P-256 key exchange ## Documentation - IMPLEMENTATION_SUMMARY.md - Complete architecture guide - NEXT_STEPS_COMPLETE.md - Implementation status and next steps - NanoTDF_Version_Notes.md - v12 vs v13 comparison - NTDF_OpenTDFKit_Feature_Request.md - Design decisions - BACKEND_TICKET_COMMENT.md - Backend integration requirements ## Performance - Chain generation: ~65-125ms - Token size: ~1300-1800 bytes (Terminal Link) - DPoP proof: ~400-600 bytes ## Backend Requirements Awaiting implementation of: 1. IdP endpoint: POST /ntdf/authorize (Terminal Link issuance) 2. Resource server: NTDF chain validation + DPoP verification Related: #160, arkavo-org/authnz-rs#12 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

- Created SignedPayload struct with ECDSA signature verification - Updated Origin and Intermediate link creation to sign payloads - Signs (claims + data) with DID key for each link - Backend can verify signatures after decrypting each link - Works with current OpenTDFKit (no API changes needed) Each link in the chain now contains a cryptographically signed payload: - Origin Link: Signs PE claims + user data - Intermediate Link: Signs NPE claims + nested Origin Link - Terminal Link (IdP): Will sign IdP claims + nested Intermediate Link The signature is embedded within the encrypted payload as JSON: { "data": <nested NanoTDF or user data>, "signature": <ECDSA P-256 signature>, "publicKey": <compressed P-256 public key>, "timestamp": <ISO 8601 date>, "algorithm": "ES256" } This approach provides multi-party attestation without requiring OpenTDFKit signature API enhancements (see OpenTDFKit#28). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>

sonarqubecloud · 2025-10-31T00:23:30Z

Quality Gate passed

Issues
26 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

arkavo-com mentioned this pull request Oct 31, 2025

Make SignatureAndPayloadConfig and PolicyBindingConfig initializers public arkavo-org/OpenTDFKit#28

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arkavo-com changed the title ~~Implement NTDF Profile v1.2 Chain of Trust Authorization~~ NTDF Token Attestation Nov 8, 2025

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NTDF Token Attestation#161

NTDF Token Attestation#161
arkavo-com wants to merge 2 commits intomainfrom
feature/ntdf-authorization-chain

arkavo-com commented Oct 31, 2025 •

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Summary

Key Components

1. DeviceAttestationManager (NEW)

2. NTDFChainBuilder (NEW)

3. DPoPGenerator (NEW)

4. ArkavoClient Integration (UPDATED)

Security Features

Usage Example

Backend Requirements

Testing

Documentation

Related Issues

Performance

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sonarqubecloud bot commented Oct 31, 2025

Quality Gate passed

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arkavo-com commented Oct 31, 2025 •

edited

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