'n Aanvaller met hierdie toestemming kan 'n KMS weergawe vernietig. Om dit te doen, moet jy eers die sleutel deaktiveer en dan dit vernietig:
# pip install google-cloud-kmsfrom google.cloud import kmsdefdisable_key_version(project_id,location_id,key_ring_id,key_id,key_version):"""Disables a key version in Cloud KMS."""# Create the client.client = kms.KeyManagementServiceClient()# Build the key version name.key_version_name = client.crypto_key_version_path(project_id, location_id, key_ring_id, key_id, key_version)# Call the API to disable the key version.client.update_crypto_key_version(request={'crypto_key_version': {'name': key_version_name, 'state': kms.CryptoKeyVersion.State.DISABLED}})defdestroy_key_version(project_id,location_id,key_ring_id,key_id,key_version):"""Destroys a key version in Cloud KMS."""# Create the client.client = kms.KeyManagementServiceClient()# Build the key version name.key_version_name = client.crypto_key_version_path(project_id, location_id, key_ring_id, key_id, key_version)# Call the API to destroy the key version.client.destroy_crypto_key_version(request={'name': key_version_name})# Example usageproject_id ='your-project-id'location_id ='your-location'key_ring_id ='your-key-ring'key_id ='your-key-id'key_version ='1'# Version number to disable and destroy# Disable the key versiondisable_key_version(project_id, location_id, key_ring_id, key_id, key_version)# Destroy the key versiondestroy_key_version(project_id, location_id, key_ring_id, key_id, key_version)
KMS Ransomware
In AWS is dit moontlik om 'n KMS-sleutel heeltemal te steel deur die KMS-hulpmiddelbeleid te wysig en slegs die aanvallers rekening toe te laat om die sleutel te gebruik. Aangesien hierdie hulpmiddelbeleide nie in GCP bestaan nie, is dit nie moontlik nie.
Daar is egter 'n ander manier om 'n globale KMS Ransomware uit te voer, wat die volgende stappe sou behels:
Skep 'n nuwe weergawe van die sleutel met 'n sleutelmateriaal ingevoer deur die aanvaller
from google.cloud import kmsimport base64defencrypt_symmetric(project_id,location_id,key_ring_id,key_id,plaintext):"""Encrypts data using a symmetric key from Cloud KMS."""# Create the client.client = kms.KeyManagementServiceClient()# Build the key name.key_name = client.crypto_key_path(project_id, location_id, key_ring_id, key_id)# Convert the plaintext to bytes.plaintext_bytes = plaintext.encode('utf-8')# Call the API.encrypt_response = client.encrypt(request={'name': key_name, 'plaintext': plaintext_bytes})ciphertext = encrypt_response.ciphertext# Optional: Encode the ciphertext to base64 for easier handling.return base64.b64encode(ciphertext)# Example usageproject_id ='your-project-id'location_id ='your-location'key_ring_id ='your-key-ring'key_id ='your-key-id'plaintext ='your-data-to-encrypt'ciphertext =encrypt_symmetric(project_id, location_id, key_ring_id, key_id, plaintext)print('Ciphertext:', ciphertext)
cloudkms.cryptoKeyVersions.useToSign
import hashlibfrom google.cloud import kmsdefsign_asymmetric(project_id,location_id,key_ring_id,key_id,key_version,message):"""Sign a message using an asymmetric key version from Cloud KMS."""# Create the client.client = kms.KeyManagementServiceClient()# Build the key version name.key_version_name = client.crypto_key_version_path(project_id, location_id, key_ring_id, key_id, key_version)# Convert the message to bytes and calculate the digest.message_bytes = message.encode('utf-8')digest ={'sha256': hashlib.sha256(message_bytes).digest()}# Call the API to sign the digest.sign_response = client.asymmetric_sign(name=key_version_name, digest=digest)return sign_response.signature# Example usage for signingproject_id ='your-project-id'location_id ='your-location'key_ring_id ='your-key-ring'key_id ='your-key-id'key_version ='1'message ='your-message'signature =sign_asymmetric(project_id, location_id, key_ring_id, key_id, key_version, message)print('Signature:', signature)
cloudkms.cryptoKeyVersions.useToVerify
from google.cloud import kmsimport hashlibdefverify_asymmetric_signature(project_id,location_id,key_ring_id,key_id,key_version,message,signature):"""Verify a signature using an asymmetric key version from Cloud KMS."""# Create the client.client = kms.KeyManagementServiceClient()# Build the key version name.key_version_name = client.crypto_key_version_path(project_id, location_id, key_ring_id, key_id, key_version)# Convert the message to bytes and calculate the digest.message_bytes = message.encode('utf-8')digest ={'sha256': hashlib.sha256(message_bytes).digest()}# Build the verify request and call the API.verify_response = client.asymmetric_verify(name=key_version_name, digest=digest, signature=signature)return verify_response.success# Example usage for verificationverified =verify_asymmetric_signature(project_id, location_id, key_ring_id, key_id, key_version, message, signature)print('Verified:', verified)
