验证证书链

获取制造商证书链并验证证明。

代码示例

Python

如需了解如何安装和使用 Cloud KMS 客户端库,请参阅 Cloud KMS 客户端库

import argparse
import gzip
import io
import zipfile

from cryptography import exceptions
from cryptography import x509
from cryptography.hazmat import backends
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import padding
import pem
import requests

ATTESTATION_SIGNATURE_LEN = 256

MANUFACTURER_CERT_URL = 'https://www.marvell.com/content/dam/marvell/en/public-collateral/security-solutions/liquid_security_certificate.zip'

# <Name(C=US,ST=California,L=San Jose,O=Cavium\, Inc.,OU=LiquidSecurity,CN=localca.liquidsecurity.cavium.com)>
MANUFACTURER_CERT_SUBJECT_BYTES = (
    b'0\x81\x911\x0b0\t\x06\x03U\x04\x06\x13\x02US1\x130\x11\x06\x03U\x04\x08'
    b'\x0c\nCalifornia1\x110\x0f\x06\x03U\x04\x07\x0c\x08San Jose1\x150\x13\x06'
    b'\x03U\x04\n\x0c\x0cCavium, Inc.1\x170\x15\x06\x03U\x04\x0b\x0c\x0e'
    b'LiquidSecurity1*0(\x06\x03U\x04\x03\x0c!localca.liquidsecurity.cavium.com'
)

# The owner root cert can be obtained from
# 'https://www.gstatic.com/cloudhsm/roots/global_1498867200.pem'
OWNER_ROOT_CERT_PEM = """Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 3 (0x3)
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = US, ST = CA, L = Mountain View, O = Google Inc, CN = Hawksbill Root v1 prod
        Validity
            Not Before: Jul  1 00:00:00 2017 GMT
            Not After : Jan  1 00:00:00 2030 GMT
        Subject: C = US, ST = CA, L = Mountain View, O = Google Inc, CN = Hawksbill Root v1 prod
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                RSA Public-Key: (2048 bit)
                Modulus:
                    00:ac:2e:a8:62:89:21:a0:70:92:df:b0:8e:c3:93:
                    4d:26:38:db:a5:a2:5f:6b:1e:6d:a8:6c:2c:83:d6:
                    5b:9a:f8:02:a0:f8:b0:16:fb:5c:da:b9:9b:b9:8b:
                    4d:bc:15:26:e0:0e:4f:2f:b5:20:43:1c:31:7e:5e:
                    c1:67:a9:36:c8:19:5e:c2:b5:a8:b6:96:76:90:7b:
                    55:15:4d:53:16:10:f0:62:d5:d8:98:19:c7:9e:0e:
                    b2:69:26:a3:f3:d9:a5:d3:70:88:21:ac:62:12:7b:
                    2a:be:20:2e:33:db:9b:90:a7:b1:bf:0f:c0:11:7a:
                    c2:98:a9:8c:4d:36:a7:1f:66:53:08:93:4b:3a:12:
                    1e:1a:3f:2b:c2:5d:8b:4b:97:d4:17:0f:41:83:27:
                    a9:f3:e0:d9:82:f8:5c:37:d4:1e:5d:e4:a8:3d:59:
                    7c:43:64:e6:02:d7:35:39:f4:95:db:77:1c:73:78:
                    2f:c4:26:8d:64:d4:01:e0:86:da:3f:27:c7:9d:bd:
                    32:25:e4:d4:34:6a:13:87:2a:85:19:ce:18:43:46:
                    c5:41:8a:81:66:ca:65:6e:c1:a1:ce:71:74:d4:b0:
                    77:b7:35:39:0d:c9:e2:c8:7e:81:69:b1:04:38:5d:
                    c1:fd:92:33:ba:ed:85:d3:91:d0:96:78:d6:30:fc:
                    56:19
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: critical
                CA:TRUE
            X509v3 Key Usage: critical
                Digital Signature, Certificate Sign, CRL Sign
            X509v3 Subject Key Identifier:
                31:E8:52:DF:E1:49:F8:12:7B:7C:6E:E7:4E:91:7A:97:75:BC:A8:AE
    Signature Algorithm: sha256WithRSAEncryption
         8f:12:8e:8e:7a:fb:59:82:a8:0f:e6:be:b8:09:5d:17:c8:8e:
         c1:3a:c7:a4:52:d4:0d:2e:ac:a8:5c:b1:f4:52:ee:b7:c4:25:
         9a:2a:32:fc:91:3d:ba:29:9a:ed:c8:de:1f:75:39:54:16:d1:
         72:74:e0:95:a0:e2:41:36:9c:f8:95:c2:21:10:29:12:5f:4d:
         d1:b0:e1:a1:5b:c5:79:3c:d1:23:c9:c9:74:c2:42:58:fa:1b:
         35:75:77:30:7a:58:b2:07:e0:cd:ec:21:e2:51:54:59:08:21:
         be:c7:05:df:6e:55:81:21:0d:d1:ad:61:81:77:27:3e:bd:39:
         81:df:bd:91:32:3d:cc:5d:eb:de:fc:a7:73:26:2f:cd:88:a7:
         70:65:f4:35:06:b3:d6:02:56:e1:ba:e6:d5:6f:b0:4d:b5:95:
         cb:c6:34:a3:a7:35:79:99:bb:bf:cb:07:a0:d4:a0:de:f2:2c:
         e8:9b:27:43:c6:c0:5c:ae:62:da:a3:bf:01:76:50:bb:6e:70:
         1f:56:8f:41:cb:7c:41:d1:b0:c7:62:41:b2:31:23:99:6a:47:
         b8:10:c0:5c:f0:9e:b0:3e:5c:bb:d5:33:cc:38:1c:a5:dc:26:
         8b:b5:e2:76:5e:f8:92:3d:df:fc:78:2b:39:e8:a6:45:d3:9b:
         f2:51:b9:fc
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
"""

def get_manufacturer_root_certificate():
    """Gets the manufacturer root certificate."""
    resp = requests.get(MANUFACTURER_CERT_URL)
    tmp_file = io.BytesIO(resp.content)
    zip_file = zipfile.ZipFile(tmp_file)
    with zip_file.open('liquid_security_certificate.crt') as f:
        return x509.load_pem_x509_certificate(f.read(), backends.default_backend())

def get_owner_root_certificate():
    """Gets the owner root certificate."""
    return x509.load_pem_x509_certificate(
        OWNER_ROOT_CERT_PEM.encode('utf-8'), backends.default_backend())

def verify_certificate(signing_cert, issued_cert):
    """Verifies the signing_cert issued the issued_cert.

    Args:
        signing_cert: The certificate used to verify the issued certificate's
          signature.
        issued_cert: The issued certificate.

    Returns:
        True if the signing_cert issued the issued_cert.
    """
    if signing_cert.subject != issued_cert.issuer:
        return False
    try:
        signing_cert.public_key().verify(issued_cert.signature,
                                         issued_cert.tbs_certificate_bytes,
                                         padding.PKCS1v15(),
                                         issued_cert.signature_hash_algorithm)
        return True
    except exceptions.InvalidSignature:
        return False
    return False

def get_issued_certificate(issuer_cert,
                           untrusted_certs,
                           predicate=lambda _: True):
    """Finds an issued certificates issued by an issuer certificate.

    The issued certificate is removed from the set of untrusted certificates.

    Args:
        issuer_cert: The issuer certificate.
        untrusted_certs: A set of untrusted certificates.
        predicate: An additional condition for the issued certificate.

    Returns:
        A certificate within the set of untrusted certificates that was issued
        by the issuer certificate and matches the predicate.
    """
    for cert in untrusted_certs:
        if verify_certificate(issuer_cert, cert) and predicate(cert):
            untrusted_certs.remove(cert)
            return cert
    return None

def verify_attestation(cert, attestation):
    """Verifies that the certificate signed the attestation.

    Args:
        cert: The certificate used to verify the attestation.
        attestation: The attestation to verify.

    Returns:
    True if the certificate verified the attestation.
    """
    data = attestation[:-ATTESTATION_SIGNATURE_LEN]
    signature = attestation[-ATTESTATION_SIGNATURE_LEN:]
    try:
        cert.public_key().verify(signature, data, padding.PKCS1v15(),
                                 hashes.SHA256())
        return True
    except exceptions.InvalidSignature:
        return False
    return False

def verify(certs_file, attestation_file):
    """Verifies that the certificate chains are valid.

    Args:
        certs_file: The certificate chains filename.
        attestation_file: The attestation filename.

    Returns:
        True if the certificate chains are valid.
    """
    mfr_root_cert = get_manufacturer_root_certificate()
    if (mfr_root_cert.subject.public_bytes(backends.default_backend()) !=
            MANUFACTURER_CERT_SUBJECT_BYTES):
        return False

    untrusted_certs_pem = pem.parse_file(certs_file)
    untrusted_certs = {
        x509.load_pem_x509_certificate(
            str(cert_pem).encode('utf-8'), backends.default_backend())
        for cert_pem in untrusted_certs_pem
    }

    # Build the manufacturer certificate chain.
    mfr_card_cert = get_issued_certificate(mfr_root_cert, untrusted_certs)
    mfr_partition_cert = get_issued_certificate(mfr_card_cert, untrusted_certs)
    if not mfr_card_cert or not mfr_partition_cert:
        print('Invalid HSM manufacturer certificate chain.')
        return False
    print('Successfully built HSM manufacturer certificate chain.')

    owner_root_cert = get_owner_root_certificate()

    # Build the owner card certificate chain.
    def _check_card_pub_key(cert):
        cert_pub_key_bytes = cert.public_key().public_bytes(
            serialization.Encoding.DER,
            serialization.PublicFormat.SubjectPublicKeyInfo)
        mfr_card_pub_key_bytes = mfr_card_cert.public_key().public_bytes(
            serialization.Encoding.DER,
            serialization.PublicFormat.SubjectPublicKeyInfo)
        return cert_pub_key_bytes == mfr_card_pub_key_bytes

    owner_card_cert = get_issued_certificate(
        owner_root_cert, untrusted_certs, predicate=_check_card_pub_key)

    # Build the owner partition certificate chain.
    def _check_partition_pub_key(cert):
        cert_pub_key_bytes = cert.public_key().public_bytes(
            serialization.Encoding.PEM,
            serialization.PublicFormat.SubjectPublicKeyInfo)
        mfr_partition_pub_key_bytes = mfr_partition_cert.public_key().public_bytes(
            serialization.Encoding.PEM,
            serialization.PublicFormat.SubjectPublicKeyInfo)
        return cert_pub_key_bytes == mfr_partition_pub_key_bytes

    owner_partition_cert = get_issued_certificate(
        owner_root_cert, untrusted_certs, predicate=_check_partition_pub_key)

    if not owner_card_cert or not owner_partition_cert or untrusted_certs:
        print('Invalid HSM owner certificate chain.')
        return False
    print('Successfully built HSM owner certificate chain.')

    with gzip.open(attestation_file, 'rb') as f:
        attestation = f.read()
        return (verify_attestation(mfr_partition_cert, attestation) and
                verify_attestation(owner_partition_cert, attestation))

if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument(
        '--certificates', help='The certificate chains filename.')
    parser.add_argument('--attestation', help='The attestation filename.')

    args = parser.parse_args()

    if verify(args.certificates, args.attestation):
        print('The attestation has been verified.')
    else:
        print('The attestation could not be verified.')

后续步骤

如需搜索并过滤其他 Google Cloud 产品的代码示例,请参阅 Google Cloud 示例浏览器