1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "net/cert/ct_objects_extractor.h"
#include <string_view>
#include "base/files/file_path.h"
#include "net/cert/ct_log_verifier.h"
#include "net/cert/ct_serialization.h"
#include "net/cert/signed_certificate_timestamp.h"
#include "net/cert/x509_certificate.h"
#include "net/test/cert_test_util.h"
#include "net/test/ct_test_util.h"
#include "net/test/test_data_directory.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net::ct {
class CTObjectsExtractorTest : public ::testing::Test {
public:
void SetUp() override {
precert_chain_ =
CreateCertificateListFromFile(GetTestCertsDirectory(),
"ct-test-embedded-cert.pem",
X509Certificate::FORMAT_AUTO);
ASSERT_EQ(2u, precert_chain_.size());
std::string der_test_cert(ct::GetDerEncodedX509Cert());
test_cert_ =
X509Certificate::CreateFromBytes(base::as_byte_span(der_test_cert));
ASSERT_TRUE(test_cert_);
log_ = CTLogVerifier::Create(ct::GetTestPublicKey(), "testlog");
ASSERT_TRUE(log_);
}
void ExtractEmbeddedSCT(scoped_refptr<X509Certificate> cert,
scoped_refptr<SignedCertificateTimestamp>* sct) {
std::string sct_list;
ASSERT_TRUE(ExtractEmbeddedSCTList(cert->cert_buffer(), &sct_list));
std::vector<std::string_view> parsed_scts;
// Make sure the SCT list can be decoded properly
ASSERT_TRUE(DecodeSCTList(sct_list, &parsed_scts));
ASSERT_EQ(1u, parsed_scts.size());
EXPECT_TRUE(DecodeSignedCertificateTimestamp(&parsed_scts[0], sct));
}
protected:
CertificateList precert_chain_;
scoped_refptr<X509Certificate> test_cert_;
scoped_refptr<const CTLogVerifier> log_;
};
// Test that an SCT can be extracted and the extracted SCT contains the
// expected data.
TEST_F(CTObjectsExtractorTest, ExtractEmbeddedSCT) {
auto sct = base::MakeRefCounted<ct::SignedCertificateTimestamp>();
ExtractEmbeddedSCT(precert_chain_[0], &sct);
EXPECT_EQ(sct->version, SignedCertificateTimestamp::V1);
EXPECT_EQ(ct::GetTestPublicKeyId(), sct->log_id);
base::Time expected_timestamp =
base::Time::UnixEpoch() + base::Milliseconds(1365181456275);
EXPECT_EQ(expected_timestamp, sct->timestamp);
}
// Test that the extractor correctly skips over issuerUniqueID and
// subjectUniqueID fields. See https://crbug.com/1199744.
TEST_F(CTObjectsExtractorTest, ExtractEmbeddedSCTListWithUIDs) {
CertificateList certs = CreateCertificateListFromFile(
GetTestCertsDirectory(), "ct-test-embedded-with-uids.pem",
X509Certificate::FORMAT_PEM_CERT_SEQUENCE);
ASSERT_EQ(1u, certs.size());
auto sct = base::MakeRefCounted<ct::SignedCertificateTimestamp>();
ExtractEmbeddedSCT(certs[0], &sct);
EXPECT_EQ(sct->version, SignedCertificateTimestamp::V1);
EXPECT_EQ(ct::GetTestPublicKeyId(), sct->log_id);
base::Time expected_timestamp =
base::Time::UnixEpoch() + base::Milliseconds(1365181456275);
EXPECT_EQ(expected_timestamp, sct->timestamp);
}
TEST_F(CTObjectsExtractorTest, ExtractPrecert) {
SignedEntryData entry;
ASSERT_TRUE(GetPrecertSignedEntry(precert_chain_[0]->cert_buffer(),
precert_chain_[1]->cert_buffer(), &entry));
ASSERT_EQ(ct::SignedEntryData::LOG_ENTRY_TYPE_PRECERT, entry.type);
// Should have empty leaf cert for this log entry type.
ASSERT_TRUE(entry.leaf_certificate.empty());
// Compare hash values of issuer spki.
ASSERT_EQ(base::as_byte_span(GetDefaultIssuerKeyHash()),
entry.issuer_key_hash);
}
TEST_F(CTObjectsExtractorTest, ExtractOrdinaryX509Cert) {
SignedEntryData entry;
ASSERT_TRUE(GetX509SignedEntry(test_cert_->cert_buffer(), &entry));
ASSERT_EQ(ct::SignedEntryData::LOG_ENTRY_TYPE_X509, entry.type);
// Should have empty tbs_certificate for this log entry type.
ASSERT_TRUE(entry.tbs_certificate.empty());
// Length of leaf_certificate should be 718, see the CT Serialization tests.
ASSERT_EQ(718U, entry.leaf_certificate.size());
}
// Test that the embedded SCT verifies
TEST_F(CTObjectsExtractorTest, ExtractedSCTVerifies) {
auto sct = base::MakeRefCounted<ct::SignedCertificateTimestamp>();
ExtractEmbeddedSCT(precert_chain_[0], &sct);
SignedEntryData entry;
ASSERT_TRUE(GetPrecertSignedEntry(precert_chain_[0]->cert_buffer(),
precert_chain_[1]->cert_buffer(), &entry));
EXPECT_TRUE(log_->Verify(entry, *sct.get()));
}
// Test that an externally-provided SCT verifies over the SignedEntryData
// of a regular X.509 Certificate
TEST_F(CTObjectsExtractorTest, ComplementarySCTVerifies) {
auto sct = base::MakeRefCounted<ct::SignedCertificateTimestamp>();
GetX509CertSCT(&sct);
SignedEntryData entry;
ASSERT_TRUE(GetX509SignedEntry(test_cert_->cert_buffer(), &entry));
EXPECT_TRUE(log_->Verify(entry, *sct.get()));
}
// Test that the extractor can parse OCSP responses.
TEST_F(CTObjectsExtractorTest, ExtractSCTListFromOCSPResponse) {
std::string der_subject_cert(ct::GetDerEncodedFakeOCSPResponseCert());
scoped_refptr<X509Certificate> subject_cert =
X509Certificate::CreateFromBytes(base::as_byte_span(der_subject_cert));
ASSERT_TRUE(subject_cert);
std::string der_issuer_cert(ct::GetDerEncodedFakeOCSPResponseIssuerCert());
scoped_refptr<X509Certificate> issuer_cert =
X509Certificate::CreateFromBytes(base::as_byte_span(der_issuer_cert));
ASSERT_TRUE(issuer_cert);
std::string fake_sct_list = ct::GetFakeOCSPExtensionValue();
ASSERT_FALSE(fake_sct_list.empty());
std::string ocsp_response = ct::GetDerEncodedFakeOCSPResponse();
std::string extracted_sct_list;
EXPECT_TRUE(ct::ExtractSCTListFromOCSPResponse(
issuer_cert->cert_buffer(), subject_cert->serial_number(), ocsp_response,
&extracted_sct_list));
EXPECT_EQ(extracted_sct_list, fake_sct_list);
}
// Test that the extractor honours serial number.
TEST_F(CTObjectsExtractorTest, ExtractSCTListFromOCSPResponseMatchesSerial) {
std::string der_issuer_cert(ct::GetDerEncodedFakeOCSPResponseIssuerCert());
scoped_refptr<X509Certificate> issuer_cert =
X509Certificate::CreateFromBytes(base::as_byte_span(der_issuer_cert));
ASSERT_TRUE(issuer_cert);
std::string ocsp_response = ct::GetDerEncodedFakeOCSPResponse();
std::string extracted_sct_list;
EXPECT_FALSE(ct::ExtractSCTListFromOCSPResponse(
issuer_cert->cert_buffer(), test_cert_->serial_number(), ocsp_response,
&extracted_sct_list));
}
// Test that the extractor honours issuer ID.
TEST_F(CTObjectsExtractorTest, ExtractSCTListFromOCSPResponseMatchesIssuer) {
std::string der_subject_cert(ct::GetDerEncodedFakeOCSPResponseCert());
scoped_refptr<X509Certificate> subject_cert =
X509Certificate::CreateFromBytes(base::as_byte_span(der_subject_cert));
ASSERT_TRUE(subject_cert);
std::string ocsp_response = ct::GetDerEncodedFakeOCSPResponse();
std::string extracted_sct_list;
// Use test_cert_ for issuer - it is not the correct issuer of |subject_cert|.
EXPECT_FALSE(ct::ExtractSCTListFromOCSPResponse(
test_cert_->cert_buffer(), subject_cert->serial_number(), ocsp_response,
&extracted_sct_list));
}
} // namespace net::ct
|
