feat: add marketplace metrics, privacy features, and service registry endpoints
- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels - Implement confidential transaction models with encryption support and access control - Add key management system with registration, rotation, and audit logging - Create services and registry routers for service discovery and management - Integrate ZK proof generation for privacy-preserving receipts - Add metrics instru
This commit is contained in:
oib
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tests/security/test_confidential_transactions.py
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700
tests/security/test_confidential_transactions.py
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"""
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Security tests for AITBC Confidential Transactions
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"""
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import pytest
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import json
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from datetime import datetime, timedelta
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from unittest.mock import Mock, patch, AsyncMock
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from cryptography.hazmat.primitives.asymmetric import x25519
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from cryptography.hazmat.primitives.ciphers.aead import AESGCM
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.kdf.hkdf import HKDF
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from apps.coordinator_api.src.app.services.confidential_service import ConfidentialTransactionService
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from apps.coordinator_api.src.app.models.confidential import ConfidentialTransaction, ViewingKey
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from packages.py.aitbc_crypto import encrypt_data, decrypt_data, generate_viewing_key
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@pytest.mark.security
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class TestConfidentialTransactionSecurity:
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"""Security tests for confidential transaction functionality"""
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@pytest.fixture
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def confidential_service(self, db_session):
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"""Create confidential transaction service"""
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return ConfidentialTransactionService(db_session)
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@pytest.fixture
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def sample_sender_keys(self):
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"""Generate sender's key pair"""
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private_key = x25519.X25519PrivateKey.generate()
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public_key = private_key.public_key()
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return private_key, public_key
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@pytest.fixture
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def sample_receiver_keys(self):
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"""Generate receiver's key pair"""
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private_key = x25519.X25519PrivateKey.generate()
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public_key = private_key.public_key()
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return private_key, public_key
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def test_encryption_confidentiality(self, sample_sender_keys, sample_receiver_keys):
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"""Test that transaction data remains confidential"""
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sender_private, sender_public = sample_sender_keys
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receiver_private, receiver_public = sample_receiver_keys
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# Original transaction data
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transaction_data = {
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"sender": "0x1234567890abcdef",
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"receiver": "0xfedcba0987654321",
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"amount": 1000000, # 1 USDC
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"asset": "USDC",
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"nonce": 12345,
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}
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# Encrypt for receiver only
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ciphertext = encrypt_data(
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data=json.dumps(transaction_data),
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sender_key=sender_private,
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receiver_key=receiver_public
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)
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# Verify ciphertext doesn't reveal plaintext
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assert transaction_data["sender"] not in ciphertext
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assert transaction_data["receiver"] not in ciphertext
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assert str(transaction_data["amount"]) not in ciphertext
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# Only receiver can decrypt
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decrypted = decrypt_data(
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ciphertext=ciphertext,
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receiver_key=receiver_private,
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sender_key=sender_public
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)
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decrypted_data = json.loads(decrypted)
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assert decrypted_data == transaction_data
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def test_viewing_key_generation(self):
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"""Test secure viewing key generation"""
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# Generate viewing key for auditor
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viewing_key = generate_viewing_key(
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purpose="audit",
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expires_at=datetime.utcnow() + timedelta(days=30),
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permissions=["view_amount", "view_parties"]
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)
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# Verify key structure
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assert "key_id" in viewing_key
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assert "key_data" in viewing_key
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assert "expires_at" in viewing_key
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assert "permissions" in viewing_key
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# Verify key entropy
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assert len(viewing_key["key_data"]) >= 32 # At least 256 bits
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# Verify expiration
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assert viewing_key["expires_at"] > datetime.utcnow()
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def test_viewing_key_permissions(self, confidential_service):
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"""Test that viewing keys respect permission constraints"""
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# Create confidential transaction
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tx = ConfidentialTransaction(
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id="confidential-tx-123",
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ciphertext="encrypted_data_here",
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sender_key="sender_pubkey",
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receiver_key="receiver_pubkey",
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created_at=datetime.utcnow(),
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)
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# Create viewing key with limited permissions
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viewing_key = ViewingKey(
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id="view-key-123",
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transaction_id=tx.id,
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key_data="encrypted_viewing_key",
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permissions=["view_amount"],
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expires_at=datetime.utcnow() + timedelta(days=1),
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created_at=datetime.utcnow(),
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)
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# Test permission enforcement
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with patch.object(confidential_service, 'decrypt_with_viewing_key') as mock_decrypt:
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mock_decrypt.return_value = {"amount": 1000}
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# Should succeed with valid permission
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result = confidential_service.view_transaction(
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tx.id,
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viewing_key.id,
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fields=["amount"]
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)
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assert "amount" in result
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# Should fail with invalid permission
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with pytest.raises(PermissionError):
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confidential_service.view_transaction(
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tx.id,
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viewing_key.id,
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fields=["sender", "receiver"] # Not permitted
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)
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def test_key_rotation_security(self, confidential_service):
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"""Test secure key rotation"""
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# Create initial keys
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old_key = x25519.X25519PrivateKey.generate()
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new_key = x25519.X25519PrivateKey.generate()
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# Test key rotation process
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rotation_result = confidential_service.rotate_keys(
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transaction_id="tx-123",
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old_key=old_key,
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new_key=new_key
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)
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assert rotation_result["success"] is True
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assert "new_ciphertext" in rotation_result
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assert "rotation_id" in rotation_result
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# Verify old key can't decrypt new ciphertext
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with pytest.raises(Exception):
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decrypt_data(
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ciphertext=rotation_result["new_ciphertext"],
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receiver_key=old_key,
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sender_key=old_key.public_key()
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)
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# Verify new key can decrypt
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decrypted = decrypt_data(
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ciphertext=rotation_result["new_ciphertext"],
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receiver_key=new_key,
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sender_key=new_key.public_key()
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)
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assert decrypted is not None
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def test_transaction_replay_protection(self, confidential_service):
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"""Test protection against transaction replay"""
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# Create transaction with nonce
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transaction = {
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"sender": "0x123",
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"receiver": "0x456",
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"amount": 1000,
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"nonce": 12345,
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"timestamp": datetime.utcnow().isoformat(),
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}
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# Store nonce
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confidential_service.store_nonce(12345, "tx-123")
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# Try to replay with same nonce
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with pytest.raises(ValueError, match="nonce already used"):
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confidential_service.validate_transaction_nonce(
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transaction["nonce"],
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transaction["sender"]
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)
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def test_side_channel_resistance(self, confidential_service):
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"""Test resistance to timing attacks"""
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import time
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# Create transactions with different amounts
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small_amount = {"amount": 1}
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large_amount = {"amount": 1000000}
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# Encrypt both
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small_cipher = encrypt_data(
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json.dumps(small_amount),
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x25519.X25519PrivateKey.generate(),
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x25519.X25519PrivateKey.generate().public_key()
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)
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large_cipher = encrypt_data(
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json.dumps(large_amount),
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x25519.X25519PrivateKey.generate(),
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x25519.X25519PrivateKey.generate().public_key()
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)
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# Measure decryption times
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times = []
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for ciphertext in [small_cipher, large_cipher]:
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start = time.perf_counter()
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try:
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decrypt_data(
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ciphertext,
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x25519.X25519PrivateKey.generate(),
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x25519.X25519PrivateKey.generate().public_key()
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)
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except:
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pass # Expected to fail with wrong keys
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end = time.perf_counter()
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times.append(end - start)
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# Times should be similar (within 10%)
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time_diff = abs(times[0] - times[1]) / max(times)
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assert time_diff < 0.1, f"Timing difference too large: {time_diff}"
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def test_zero_knowledge_proof_integration(self):
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"""Test ZK proof integration for privacy"""
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from apps.zk_circuits import generate_proof, verify_proof
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# Create confidential transaction
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transaction = {
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"input_commitment": "commitment123",
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"output_commitment": "commitment456",
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"amount": 1000,
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}
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# Generate ZK proof
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with patch('apps.zk_circuits.generate_proof') as mock_generate:
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mock_generate.return_value = {
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"proof": "zk_proof_here",
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"inputs": ["hash1", "hash2"],
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}
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proof_data = mock_generate(transaction)
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# Verify proof structure
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assert "proof" in proof_data
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assert "inputs" in proof_data
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assert len(proof_data["inputs"]) == 2
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# Verify proof
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with patch('apps.zk_circuits.verify_proof') as mock_verify:
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mock_verify.return_value = True
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is_valid = mock_verify(
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proof=proof_data["proof"],
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inputs=proof_data["inputs"]
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)
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assert is_valid is True
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def test_audit_log_integrity(self, confidential_service):
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"""Test that audit logs maintain integrity"""
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# Create confidential transaction
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tx = ConfidentialTransaction(
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id="audit-tx-123",
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ciphertext="encrypted_data",
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sender_key="sender_key",
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receiver_key="receiver_key",
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created_at=datetime.utcnow(),
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)
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# Log access
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access_log = confidential_service.log_access(
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transaction_id=tx.id,
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user_id="auditor-123",
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action="view_with_viewing_key",
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timestamp=datetime.utcnow()
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)
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# Verify log integrity
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assert "log_id" in access_log
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assert "hash" in access_log
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assert "signature" in access_log
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# Verify log can't be tampered
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original_hash = access_log["hash"]
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access_log["user_id"] = "malicious-user"
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# Recalculate hash should differ
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new_hash = confidential_service.calculate_log_hash(access_log)
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assert new_hash != original_hash
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def test_hsm_integration_security(self):
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"""Test HSM integration for key management"""
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from apps.coordinator_api.src.app.services.hsm_service import HSMService
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# Mock HSM client
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mock_hsm = Mock()
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mock_hsm.generate_key.return_value = {"key_id": "hsm-key-123"}
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mock_hsm.sign_data.return_value = {"signature": "hsm-signature"}
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mock_hsm.encrypt.return_value = {"ciphertext": "hsm-encrypted"}
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with patch('apps.coordinator_api.src.app.services.hsm_service.HSMClient') as mock_client:
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mock_client.return_value = mock_hsm
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hsm_service = HSMService()
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# Test key generation
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key_result = hsm_service.generate_key(
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key_type="encryption",
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purpose="confidential_tx"
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)
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assert key_result["key_id"] == "hsm-key-123"
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# Test signing
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sign_result = hsm_service.sign_data(
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key_id="hsm-key-123",
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data="transaction_data"
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)
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assert "signature" in sign_result
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# Verify HSM was called
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mock_hsm.generate_key.assert_called_once()
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mock_hsm.sign_data.assert_called_once()
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def test_multi_party_computation(self):
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"""Test MPC for transaction validation"""
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from apps.coordinator_api.src.app.services.mpc_service import MPCService
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mpc_service = MPCService()
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# Create transaction shares
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transaction = {
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"amount": 1000,
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"sender": "0x123",
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"receiver": "0x456",
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}
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# Generate shares
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shares = mpc_service.create_shares(transaction, threshold=3, total=5)
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assert len(shares) == 5
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assert all("share_id" in share for share in shares)
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assert all("encrypted_data" in share for share in shares)
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# Test reconstruction with sufficient shares
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selected_shares = shares[:3]
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reconstructed = mpc_service.reconstruct_transaction(selected_shares)
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assert reconstructed["amount"] == transaction["amount"]
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assert reconstructed["sender"] == transaction["sender"]
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# Test insufficient shares fail
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with pytest.raises(ValueError):
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mpc_service.reconstruct_transaction(shares[:2])
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def test_forward_secrecy(self):
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"""Test forward secrecy of confidential transactions"""
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# Generate ephemeral keys
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ephemeral_private = x25519.X25519PrivateKey.generate()
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ephemeral_public = ephemeral_private.public_key()
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receiver_private = x25519.X25519PrivateKey.generate()
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receiver_public = receiver_private.public_key()
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# Create shared secret
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shared_secret = ephemeral_private.exchange(receiver_public)
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# Derive encryption key
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derived_key = HKDF(
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algorithm=hashes.SHA256(),
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length=32,
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salt=None,
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info=b"aitbc-confidential-tx",
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).derive(shared_secret)
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# Encrypt transaction
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aesgcm = AESGCM(derived_key)
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nonce = AESGCM.generate_nonce(12)
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transaction_data = json.dumps({"amount": 1000})
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ciphertext = aesgcm.encrypt(nonce, transaction_data.encode(), None)
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# Even if ephemeral key is compromised later, past transactions remain secure
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# because the shared secret is not stored
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# Verify decryption works with current keys
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aesgcm_decrypt = AESGCM(derived_key)
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decrypted = aesgcm_decrypt.decrypt(nonce, ciphertext, None)
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assert json.loads(decrypted) == {"amount": 1000}
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def test_deniable_encryption(self):
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"""Test deniable encryption for plausible deniability"""
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from apps.coordinator_api.src.app.services.deniable_service import DeniableEncryption
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deniable = DeniableEncryption()
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# Create two plausible messages
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real_message = {"amount": 1000000, "asset": "USDC"}
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fake_message = {"amount": 100, "asset": "USDC"}
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# Generate deniable ciphertext
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result = deniable.encrypt(
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real_message=real_message,
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fake_message=fake_message,
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receiver_key=x25519.X25519PrivateKey.generate()
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)
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assert "ciphertext" in result
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assert "real_key" in result
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assert "fake_key" in result
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# Can reveal either message depending on key provided
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real_decrypted = deniable.decrypt(
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ciphertext=result["ciphertext"],
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key=result["real_key"]
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)
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assert json.loads(real_decrypted) == real_message
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fake_decrypted = deniable.decrypt(
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ciphertext=result["ciphertext"],
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key=result["fake_key"]
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)
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assert json.loads(fake_decrypted) == fake_message
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@pytest.mark.security
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class TestConfidentialTransactionVulnerabilities:
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"""Test for potential vulnerabilities in confidential transactions"""
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def test_timing_attack_prevention(self):
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"""Test prevention of timing attacks on amount comparison"""
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import time
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import statistics
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# Create various transaction amounts
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amounts = [1, 100, 1000, 10000, 100000, 1000000]
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encryption_times = []
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for amount in amounts:
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transaction = {"amount": amount}
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# Measure encryption time
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start = time.perf_counter_ns()
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ciphertext = encrypt_data(
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json.dumps(transaction),
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x25519.X25519PrivateKey.generate(),
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x25519.X25519PrivateKey.generate().public_key()
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)
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end = time.perf_counter_ns()
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encryption_times.append(end - start)
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# Check if encryption time correlates with amount
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correlation = statistics.correlation(amounts, encryption_times)
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assert abs(correlation) < 0.1, f"Timing correlation detected: {correlation}"
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def test_memory_sanitization(self):
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"""Test that sensitive memory is properly sanitized"""
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import gc
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import sys
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# Create confidential transaction
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sensitive_data = "secret_transaction_data_12345"
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# Encrypt data
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ciphertext = encrypt_data(
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sensitive_data,
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x25519.X25519PrivateKey.generate(),
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x25519.X25519PrivateKey.generate().public_key()
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)
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# Force garbage collection
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del sensitive_data
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gc.collect()
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# Check if sensitive data still exists in memory
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memory_dump = str(sys.getsizeof(ciphertext))
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assert "secret_transaction_data_12345" not in memory_dump
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def test_key_derivation_security(self):
|
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"""Test security of key derivation functions"""
|
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from cryptography.hazmat.primitives.kdf.hkdf import HKDF
|
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from cryptography.hazmat.primitives import hashes
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|
||||
# Test with different salts
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base_key = b"base_key_material"
|
||||
salt1 = b"salt_1"
|
||||
salt2 = b"salt_2"
|
||||
|
||||
kdf1 = HKDF(
|
||||
algorithm=hashes.SHA256(),
|
||||
length=32,
|
||||
salt=salt1,
|
||||
info=b"aitbc-key-derivation",
|
||||
)
|
||||
|
||||
kdf2 = HKDF(
|
||||
algorithm=hashes.SHA256(),
|
||||
length=32,
|
||||
salt=salt2,
|
||||
info=b"aitbc-key-derivation",
|
||||
)
|
||||
|
||||
key1 = kdf1.derive(base_key)
|
||||
key2 = kdf2.derive(base_key)
|
||||
|
||||
# Different salts should produce different keys
|
||||
assert key1 != key2
|
||||
|
||||
# Keys should be sufficiently random
|
||||
# Test by checking bit distribution
|
||||
bit_count = sum(bin(byte).count('1') for byte in key1)
|
||||
bit_ratio = bit_count / (len(key1) * 8)
|
||||
assert 0.45 < bit_ratio < 0.55, "Key bits not evenly distributed"
|
||||
|
||||
def test_side_channel_leakage_prevention(self):
|
||||
"""Test prevention of various side channel attacks"""
|
||||
import psutil
|
||||
import os
|
||||
|
||||
# Monitor resource usage during encryption
|
||||
process = psutil.Process(os.getpid())
|
||||
|
||||
# Baseline measurements
|
||||
baseline_cpu = process.cpu_percent()
|
||||
baseline_memory = process.memory_info().rss
|
||||
|
||||
# Perform encryption operations
|
||||
for i in range(100):
|
||||
data = f"transaction_data_{i}"
|
||||
encrypt_data(
|
||||
data,
|
||||
x25519.X25519PrivateKey.generate(),
|
||||
x25519.X25519PrivateKey.generate().public_key()
|
||||
)
|
||||
|
||||
# Check for unusual resource usage patterns
|
||||
final_cpu = process.cpu_percent()
|
||||
final_memory = process.memory_info().rss
|
||||
|
||||
cpu_increase = final_cpu - baseline_cpu
|
||||
memory_increase = final_memory - baseline_memory
|
||||
|
||||
# Resource usage should be consistent
|
||||
assert cpu_increase < 50, f"Excessive CPU usage: {cpu_increase}%"
|
||||
assert memory_increase < 100 * 1024 * 1024, f"Excessive memory usage: {memory_increase} bytes"
|
||||
|
||||
def test_quantum_resistance_preparation(self):
|
||||
"""Test preparation for quantum-resistant cryptography"""
|
||||
# Test post-quantum key exchange simulation
|
||||
from apps.coordinator_api.src.app.services.pqc_service import PostQuantumCrypto
|
||||
|
||||
pqc = PostQuantumCrypto()
|
||||
|
||||
# Generate quantum-resistant key pair
|
||||
key_pair = pqc.generate_keypair(algorithm="kyber768")
|
||||
|
||||
assert "private_key" in key_pair
|
||||
assert "public_key" in key_pair
|
||||
assert "algorithm" in key_pair
|
||||
assert key_pair["algorithm"] == "kyber768"
|
||||
|
||||
# Test quantum-resistant signature
|
||||
message = "confidential_transaction_hash"
|
||||
signature = pqc.sign(
|
||||
message=message,
|
||||
private_key=key_pair["private_key"],
|
||||
algorithm="dilithium3"
|
||||
)
|
||||
|
||||
assert "signature" in signature
|
||||
assert "algorithm" in signature
|
||||
|
||||
# Verify signature
|
||||
is_valid = pqc.verify(
|
||||
message=message,
|
||||
signature=signature["signature"],
|
||||
public_key=key_pair["public_key"],
|
||||
algorithm="dilithium3"
|
||||
)
|
||||
|
||||
assert is_valid is True
|
||||
|
||||
|
||||
@pytest.mark.security
|
||||
class TestConfidentialTransactionCompliance:
|
||||
"""Test compliance features for confidential transactions"""
|
||||
|
||||
def test_regulatory_reporting(self, confidential_service):
|
||||
"""Test regulatory reporting while maintaining privacy"""
|
||||
# Create confidential transaction
|
||||
tx = ConfidentialTransaction(
|
||||
id="regulatory-tx-123",
|
||||
ciphertext="encrypted_data",
|
||||
sender_key="sender_key",
|
||||
receiver_key="receiver_key",
|
||||
created_at=datetime.utcnow(),
|
||||
)
|
||||
|
||||
# Generate regulatory report
|
||||
report = confidential_service.generate_regulatory_report(
|
||||
transaction_id=tx.id,
|
||||
reporting_fields=["timestamp", "asset_type", "jurisdiction"],
|
||||
viewing_authority="financial_authority_123"
|
||||
)
|
||||
|
||||
# Report should contain required fields but not private data
|
||||
assert "transaction_id" in report
|
||||
assert "timestamp" in report
|
||||
assert "asset_type" in report
|
||||
assert "jurisdiction" in report
|
||||
assert "amount" not in report # Should remain confidential
|
||||
assert "sender" not in report # Should remain confidential
|
||||
assert "receiver" not in report # Should remain confidential
|
||||
|
||||
def test_kyc_aml_integration(self, confidential_service):
|
||||
"""Test KYC/AML checks without compromising privacy"""
|
||||
# Create transaction with encrypted parties
|
||||
encrypted_parties = {
|
||||
"sender": "encrypted_sender_data",
|
||||
"receiver": "encrypted_receiver_data",
|
||||
}
|
||||
|
||||
# Perform KYC/AML check
|
||||
with patch('apps.coordinator_api.src.app.services.aml_service.check_parties') as mock_aml:
|
||||
mock_aml.return_value = {
|
||||
"sender_status": "cleared",
|
||||
"receiver_status": "cleared",
|
||||
"risk_score": 0.2,
|
||||
}
|
||||
|
||||
aml_result = confidential_service.perform_aml_check(
|
||||
encrypted_parties=encrypted_parties,
|
||||
viewing_permission="regulatory_only"
|
||||
)
|
||||
|
||||
assert aml_result["sender_status"] == "cleared"
|
||||
assert aml_result["risk_score"] < 0.5
|
||||
|
||||
# Verify parties remain encrypted
|
||||
assert "sender_address" not in aml_result
|
||||
assert "receiver_address" not in aml_result
|
||||
|
||||
def test_audit_trail_privacy(self, confidential_service):
|
||||
"""Test audit trail that preserves privacy"""
|
||||
# Create series of confidential transactions
|
||||
transactions = [
|
||||
{"id": f"tx-{i}", "amount": 1000 * i}
|
||||
for i in range(10)
|
||||
]
|
||||
|
||||
# Generate privacy-preserving audit trail
|
||||
audit_trail = confidential_service.generate_audit_trail(
|
||||
transactions=transactions,
|
||||
privacy_level="high",
|
||||
auditor_id="auditor_123"
|
||||
)
|
||||
|
||||
# Audit trail should have:
|
||||
assert "transaction_count" in audit_trail
|
||||
assert "total_volume" in audit_trail
|
||||
assert "time_range" in audit_trail
|
||||
assert "compliance_hash" in audit_trail
|
||||
|
||||
# But should not have:
|
||||
assert "transaction_ids" not in audit_trail
|
||||
assert "individual_amounts" not in audit_trail
|
||||
assert "party_addresses" not in audit_trail
|
||||
|
||||
def test_data_retention_policy(self, confidential_service):
|
||||
"""Test data retention and automatic deletion"""
|
||||
# Create old confidential transaction
|
||||
old_tx = ConfidentialTransaction(
|
||||
id="old-tx-123",
|
||||
ciphertext="old_encrypted_data",
|
||||
created_at=datetime.utcnow() - timedelta(days=400), # Over 1 year
|
||||
)
|
||||
|
||||
# Test retention policy enforcement
|
||||
with patch('apps.coordinator_api.src.app.services.retention_service.check_retention') as mock_check:
|
||||
mock_check.return_value = {"should_delete": True, "reason": "expired"}
|
||||
|
||||
deletion_result = confidential_service.enforce_retention_policy(
|
||||
transaction_id=old_tx.id,
|
||||
policy_duration_days=365
|
||||
)
|
||||
|
||||
assert deletion_result["deleted"] is True
|
||||
assert "deletion_timestamp" in deletion_result
|
||||
assert "compliance_log" in deletion_result
|
||||
Reference in New Issue
Block a user