1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/memory/scoped_ptr.h"
6#include "crypto/ec_private_key.h"
7#include "crypto/openssl_util.h"
8#include "crypto/scoped_openssl_types.h"
9#include "net/cert/x509_util.h"
10#include "net/cert/x509_util_openssl.h"
11#include "testing/gtest/include/gtest/gtest.h"
12
13namespace net {
14
15namespace {
16
17typedef crypto::ScopedOpenSSL<X509, X509_free>::Type ScopedX509;
18
19// Verify that a given certificate was signed with the private key corresponding
20// to a given public key.
21// |der_cert| is the DER-encoded X.509 certificate.
22// |der_spki| is the DER-encoded public key of the signer.
23void VerifyCertificateSignature(const std::string& der_cert,
24                                const std::vector<uint8>& der_spki) {
25  const unsigned char* cert_data =
26      reinterpret_cast<const unsigned char*>(der_cert.data());
27  int cert_data_len = static_cast<int>(der_cert.size());
28  ScopedX509 cert(d2i_X509(NULL, &cert_data, cert_data_len));
29  ASSERT_TRUE(cert.get());
30
31  // NOTE: SignatureVerifier wants the DER-encoded ASN.1 AlgorithmIdentifier
32  // but there is no OpenSSL API to extract it from an X509 object (!?)
33  // Use X509_verify() directly instead, which takes an EVP_PKEY.
34  const unsigned char* pub_key_data = &der_spki.front();
35  int pub_key_len = static_cast<int>(der_spki.size());
36  crypto::ScopedEVP_PKEY pub_key(d2i_PUBKEY(NULL, &pub_key_data, pub_key_len));
37  ASSERT_TRUE(pub_key.get());
38
39  // NOTE: X509_verify() returns 1 in case of succes, 0 or -1 on error.
40  EXPECT_EQ(1, X509_verify(cert.get(), pub_key.get()));
41}
42
43// Verify the attributes of a domain-bound certificate.
44// |domain| is the bound domain name.
45// |der_cert| is the DER-encoded X.509 certificate.
46void VerifyChannelID(const std::string& domain,
47                     const std::string& der_cert) {
48  // Origin Bound Cert OID.
49  static const char oid_string[] = "1.3.6.1.4.1.11129.2.1.6";
50  crypto::ScopedOpenSSL<ASN1_OBJECT, ASN1_OBJECT_free>::Type oid_obj(
51      OBJ_txt2obj(oid_string, 0));
52  ASSERT_TRUE(oid_obj.get());
53
54  const unsigned char* cert_data =
55      reinterpret_cast<const unsigned char*>(der_cert.data());
56  int cert_data_len = static_cast<int>(der_cert.size());
57  ScopedX509 cert(d2i_X509(NULL, &cert_data, cert_data_len));
58  ASSERT_TRUE(cert.get());
59
60  // Find the extension.
61  int ext_pos = X509_get_ext_by_OBJ(cert.get(), oid_obj.get(), -1);
62  ASSERT_NE(-1, ext_pos);
63  X509_EXTENSION* ext = X509_get_ext(cert.get(), ext_pos);
64  ASSERT_TRUE(ext);
65
66  // Check its value, it must be an ASN.1 IA5STRING
67  // Which means <tag> <length> <domain>, with:
68  // <tag> == 22
69  // <length> is the domain length, a single byte for short forms.
70  // <domain> are the domain characters.
71  // See http://en.wikipedia.org/wiki/X.690
72  ASN1_STRING* value_asn1 = X509_EXTENSION_get_data(ext);
73  ASSERT_TRUE(value_asn1);
74  std::string value_str(reinterpret_cast<const char*>(value_asn1->data),
75                        value_asn1->length);
76
77  // Check that the domain size is small enough for short form.
78  ASSERT_LE(domain.size(), 127U) << "Domain is too long!";
79  std::string value_expected;
80  value_expected.resize(2);
81  value_expected[0] = 22;
82  value_expected[1] = static_cast<char>(domain.size());
83  value_expected += domain;
84
85  EXPECT_EQ(value_expected, value_str);
86}
87
88}  // namespace
89
90TEST(X509UtilOpenSSLTest, IsSupportedValidityRange) {
91  base::Time now = base::Time::Now();
92  EXPECT_TRUE(x509_util::IsSupportedValidityRange(now, now));
93  EXPECT_FALSE(x509_util::IsSupportedValidityRange(
94      now, now - base::TimeDelta::FromSeconds(1)));
95
96  // See x509_util_openssl.cc to see how these were computed.
97  const int64 kDaysFromYear0001ToUnixEpoch = 719162;
98  const int64 kDaysFromUnixEpochToYear10000 = 2932896 + 1;
99
100  // When computing too_old / too_late, add one day to account for
101  // possible leap seconds.
102  base::Time too_old = base::Time::UnixEpoch() -
103      base::TimeDelta::FromDays(kDaysFromYear0001ToUnixEpoch + 1);
104
105  base::Time too_late = base::Time::UnixEpoch() +
106      base::TimeDelta::FromDays(kDaysFromUnixEpochToYear10000 + 1);
107
108  EXPECT_FALSE(x509_util::IsSupportedValidityRange(too_old, too_old));
109  EXPECT_FALSE(x509_util::IsSupportedValidityRange(too_old, now));
110
111  EXPECT_FALSE(x509_util::IsSupportedValidityRange(now, too_late));
112  EXPECT_FALSE(x509_util::IsSupportedValidityRange(too_late, too_late));
113}
114
115TEST(X509UtilOpenSSLTest, CreateChannelIDEC) {
116  // Create a sample ASCII weborigin.
117  std::string domain = "weborigin.com";
118  base::Time now = base::Time::Now();
119
120  scoped_ptr<crypto::ECPrivateKey> private_key(
121      crypto::ECPrivateKey::Create());
122  std::string der_cert;
123  ASSERT_TRUE(
124      x509_util::CreateChannelIDEC(private_key.get(),
125                                   x509_util::DIGEST_SHA1,
126                                   domain,
127                                   1,
128                                   now,
129                                   now + base::TimeDelta::FromDays(1),
130                                   &der_cert));
131
132  VerifyChannelID(domain, der_cert);
133
134  // signature_verifier_win and signature_verifier_mac can't handle EC certs.
135  std::vector<uint8> spki;
136  ASSERT_TRUE(private_key->ExportPublicKey(&spki));
137  VerifyCertificateSignature(der_cert, spki);
138}
139
140}  // namespace net
141