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import abc
import hashlib
from ct.proto import certificate_pb2
def name_attribute(name):
att = certificate_pb2.DNAttribute()
att.type, att.value = "CN", name
return att
SAMPLE_CERT = certificate_pb2.X509Description()
SAMPLE_CERT.der = "hello\x00"
SAMPLE_CERT.subject.extend([name_attribute("com.example")])
SAMPLE_CERT.sha256_hash = hashlib.sha256("hello\x00").digest()
FOUR_CERTS = []
for i in range(0, 4):
tmp = certificate_pb2.X509Description()
tmp.der = "hello-%d" % i
tmp.subject.extend([name_attribute("com.domain-%d" % i)])
tmp.sha256_hash = hashlib.sha256("hello-%d" % i).digest()
FOUR_CERTS.append((tmp, i))
# This class provides common tests for all cert database implementations.
# It only inherits from object so that unittest won't attempt to run the test_*
# methods on this class. Derived classes should use multiple inheritance
# from CertDBTest and unittest.TestCase to get test automation.
class CertDBTest(object):
"""All cert database tests should derive from this class as well as
unittest.TestCase."""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def db(self):
"""Derived classes must override to initialize a database."""
pass
def test_store_lookup_cert(self):
self.db().store_cert_desc(SAMPLE_CERT, 0, 0)
sha256_hash = hashlib.sha256("hello\x00").digest()
cert = self.db().get_cert_by_sha256_hash(sha256_hash)
self.assertEqual(SAMPLE_CERT.der, cert)
def test_lookup_returns_none_if_no_match(self):
self.db().store_cert_desc(SAMPLE_CERT, 0, 0)
sha256_hash = hashlib.sha256("bye").digest()
self.assertIsNone(self.db().get_cert_by_sha256_hash(sha256_hash))
def test_store_cert_desc_ignores_duplicate(self):
self.db().store_cert_desc(SAMPLE_CERT, 0, 0)
sha256_hash = hashlib.sha256("hello\x00").digest()
cert = self.db().get_cert_by_sha256_hash(sha256_hash)
self.assertEqual("hello\x00", cert)
# Store again
hello2 = certificate_pb2.X509Description()
hello2.der = SAMPLE_CERT.der
hello2.subject.extend([name_attribute("com.example2")])
hello2.sha256_hash = sha256_hash
self.db().store_cert_desc(hello2, 1, 0)
certs = [c for c in self.db().scan_certs_by_subject("example.com")]
self.assertEqual(1, len(certs))
self.assertEqual(SAMPLE_CERT.der, certs[0])
certs = [c for c in self.db().scan_certs_by_subject("example2.com")]
self.assertEqual(0, len(certs))
def test_store_cert_descs_stores_all(self):
self.db().store_certs_desc(FOUR_CERTS, 0)
for i in range(4):
sha256_hash = hashlib.sha256("hello-%d" % i).digest()
cert = self.db().get_cert_by_sha256_hash(sha256_hash)
self.assertEqual("hello-%d" % i, cert)
def test_scan_certs_finds_all_certs(self):
self.db().store_certs_desc(FOUR_CERTS, 0)
certs = {c for c in self.db().scan_certs()}
self.assertEqual(4, len(certs))
for i in range(4):
self.assertTrue("hello-%d" % i in certs)
def test_scan_certs_honours_limit(self):
self.db().store_certs_desc(FOUR_CERTS, 0)
certs = {c for c in self.db().scan_certs(limit=2)}
self.assertEqual(2, len(certs))
def test_scan_certs_by_subject_finds_cert(self):
self.db().store_certs_desc(FOUR_CERTS, 0)
for i in range(4):
matches = [c for c in self.db().scan_certs_by_subject(
"domain-%d.com" % i)]
self.assertEqual(1, len(matches))
self.assertEqual("hello-%d" % i, matches[0])
def test_scan_certs_by_subject_honours_limit(self):
for i in range(0, 4):
cert = certificate_pb2.X509Description()
cert.der = "hello-%d" % i
cert.subject.extend([name_attribute("com.domain")])
cert.sha256_hash = str(i)
self.db().store_cert_desc(cert, i, 0)
matches = {c for c in self.db().scan_certs_by_subject("domain.com",
limit=2)}
self.assertEqual(2, len(matches))
def test_scan_certs_by_subject_finds_by_common_name(self):
for i in range(4):
cert = certificate_pb2.X509Description()
cert.der = "hello-%d" % i
cert.subject.extend([name_attribute("Trusty CA %d" % i)])
cert.sha256_hash = str(i)
self.db().store_cert_desc(cert, i, 0)
for i in range(4):
matches = [c for c in self.db().scan_certs_by_subject(
"Trusty CA %d" % i)]
self.assertEqual(1, len(matches))
self.assertEqual("hello-%d" % i, matches[0])
def test_scan_certs_by_subject_finds_by_all_names(self):
cert = certificate_pb2.X509Description()
cert.der = "hello"
cert.subject.extend([name_attribute("com.%d" % i) for i in range(4)])
cert.sha256_hash = 'asdf'
self.db().store_cert_desc(cert, 0, 0)
for i in range(4):
matches = [c for c in self.db().scan_certs_by_subject("%d.com" % i)]
self.assertEqual(1, len(matches))
self.assertEqual("hello", matches[0])
def test_scan_certs_by_subject_finds_by_prefix(self):
for i in range(4):
cert = certificate_pb2.X509Description()
cert.der = "hello-%d" % i
cert.subject.extend([name_attribute("com.example" + (".%d" % i)*i)])
cert.sha256_hash = str(i)
self.db().store_cert_desc(cert, i, 0)
matches = {c for c in self.db().scan_certs_by_subject("example.com")}
self.assertEqual(4, len(matches))
for i in range(4):
self.assertTrue("hello-%d" % i in matches)
def test_scan_certs_by_subject_ignores_longer(self):
cert = certificate_pb2.X509Description()
cert.der = "hello"
cert.subject.extend([name_attribute("example.com")])
self.db().store_cert_desc(cert, 0, 0)
matches = {c for c in self.db().scan_certs_by_subject(
"mail.example.com")}
self.assertEqual(0, len(matches))
def test_scan_certs_by_subject_finds_by_literal_wildcard(self):
cert = certificate_pb2.X509Description()
cert.der = "hello-wild"
cert.subject.extend([name_attribute("com.example.*")])
cert.sha256_hash = 'cert'
self.db().store_cert_desc(cert, 0, 0)
cert2 = certificate_pb2.X509Description()
cert2.der = "hello"
cert2.subject.extend([name_attribute("com.example.www")])
cert.sha256_hash = 'cert2'
self.db().store_cert_desc(cert2, 1, 0)
matches = [c for c in self.db().scan_certs_by_subject(
"*.example.com")]
self.assertEqual(1, len(matches))
self.assertEqual("hello-wild", matches[0])
def test_scan_certs_by_subject_ignores_wildcard_cert(self):
for i in range(4):
cert = certificate_pb2.X509Description()
cert.der = "hello-%d" % i
cert.subject.extend([name_attribute("com.example.%d" % i)])
cert.sha256_hash = str(i)
self.db().store_cert_desc(cert, i, 0)
cert = certificate_pb2.X509Description()
cert.der = "hello-wild"
cert.subject.extend([name_attribute("com.example.*")])
cert.sha256_hash = 'asdf'
self.db().store_cert_desc(cert, 0, 0)
matches = {c for c in self.db().scan_certs_by_subject(
"2.example.com")}
self.assertEqual(1, len(matches))
self.assertTrue("hello-2" in matches)
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