1 // Copyright 2013 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 "net/cert/ct_serialization.h"
6
7 #include <string>
8
9 #include "base/files/file_path.h"
10 #include "base/files/file_util.h"
11 #include "net/base/net_log.h"
12 #include "net/base/test_completion_callback.h"
13 #include "net/base/test_data_directory.h"
14 #include "net/cert/x509_certificate.h"
15 #include "net/test/cert_test_util.h"
16 #include "net/test/ct_test_util.h"
17 #include "testing/gtest/include/gtest/gtest.h"
18
19 namespace net {
20
21 class CtSerializationTest : public ::testing::Test {
22 public:
SetUp()23 virtual void SetUp() OVERRIDE {
24 test_digitally_signed_ = ct::GetTestDigitallySigned();
25 }
26
27 protected:
28 std::string test_digitally_signed_;
29 };
30
TEST_F(CtSerializationTest,DecodesDigitallySigned)31 TEST_F(CtSerializationTest, DecodesDigitallySigned) {
32 base::StringPiece digitally_signed(test_digitally_signed_);
33 ct::DigitallySigned parsed;
34
35 ASSERT_TRUE(ct::DecodeDigitallySigned(&digitally_signed, &parsed));
36 EXPECT_EQ(
37 ct::DigitallySigned::HASH_ALGO_SHA256,
38 parsed.hash_algorithm);
39
40 EXPECT_EQ(
41 ct::DigitallySigned::SIG_ALGO_ECDSA,
42 parsed.signature_algorithm);
43
44 // The encoded data contains the signature itself from the 4th byte.
45 // The first bytes are:
46 // 1 byte of hash algorithm
47 // 1 byte of signature algorithm
48 // 2 bytes - prefix containing length of the signature data.
49 EXPECT_EQ(
50 test_digitally_signed_.substr(4),
51 parsed.signature_data);
52 }
53
54
TEST_F(CtSerializationTest,FailsToDecodePartialDigitallySigned)55 TEST_F(CtSerializationTest, FailsToDecodePartialDigitallySigned) {
56 base::StringPiece digitally_signed(test_digitally_signed_);
57 base::StringPiece partial_digitally_signed(
58 digitally_signed.substr(0, test_digitally_signed_.size() - 5));
59 ct::DigitallySigned parsed;
60
61 ASSERT_FALSE(ct::DecodeDigitallySigned(&partial_digitally_signed, &parsed));
62 }
63
64
TEST_F(CtSerializationTest,EncodesDigitallySigned)65 TEST_F(CtSerializationTest, EncodesDigitallySigned) {
66 ct::DigitallySigned digitally_signed;
67 digitally_signed.hash_algorithm = ct::DigitallySigned::HASH_ALGO_SHA256;
68 digitally_signed.signature_algorithm = ct::DigitallySigned::SIG_ALGO_ECDSA;
69 digitally_signed.signature_data = test_digitally_signed_.substr(4);
70
71 std::string encoded;
72
73 ASSERT_TRUE(ct::EncodeDigitallySigned(digitally_signed, &encoded));
74 EXPECT_EQ(test_digitally_signed_, encoded);
75 }
76
77
TEST_F(CtSerializationTest,EncodesLogEntryForX509Cert)78 TEST_F(CtSerializationTest, EncodesLogEntryForX509Cert) {
79 ct::LogEntry entry;
80 GetX509CertLogEntry(&entry);
81
82 std::string encoded;
83 ASSERT_TRUE(ct::EncodeLogEntry(entry, &encoded));
84 EXPECT_EQ((718U + 5U), encoded.size());
85 // First two bytes are log entry type. Next, length:
86 // Length is 718 which is 512 + 206, which is 0x2ce
87 std::string expected_prefix("\0\0\0\x2\xCE", 5);
88 // Note we use std::string comparison rather than ASSERT_STREQ due
89 // to null characters in the buffer.
90 EXPECT_EQ(expected_prefix, encoded.substr(0, 5));
91 }
92
TEST_F(CtSerializationTest,EncodesV1SCTSignedData)93 TEST_F(CtSerializationTest, EncodesV1SCTSignedData) {
94 base::Time timestamp = base::Time::UnixEpoch() +
95 base::TimeDelta::FromMilliseconds(1348589665525);
96 std::string dummy_entry("abc");
97 std::string empty_extensions;
98 // For now, no known failure cases.
99 std::string encoded;
100 ASSERT_TRUE(ct::EncodeV1SCTSignedData(
101 timestamp,
102 dummy_entry,
103 empty_extensions,
104 &encoded));
105 EXPECT_EQ((size_t) 15, encoded.size());
106 // Byte 0 is version, byte 1 is signature type
107 // Bytes 2-10 are timestamp
108 // Bytes 11-14 are the log signature
109 // Byte 15 is the empty extension
110 //EXPECT_EQ(0, timestamp.ToTimeT());
111 std::string expected_buffer(
112 "\x0\x0\x0\x0\x1\x39\xFE\x35\x3C\xF5\x61\x62\x63\x0\x0", 15);
113 EXPECT_EQ(expected_buffer, encoded);
114 }
115
TEST_F(CtSerializationTest,DecodesSCTList)116 TEST_F(CtSerializationTest, DecodesSCTList) {
117 // Two items in the list: "abc", "def"
118 base::StringPiece encoded("\x0\xa\x0\x3\x61\x62\x63\x0\x3\x64\x65\x66", 12);
119 std::vector<base::StringPiece> decoded;
120
121 ASSERT_TRUE(ct::DecodeSCTList(&encoded, &decoded));
122 ASSERT_STREQ("abc", decoded[0].data());
123 ASSERT_STREQ("def", decoded[1].data());
124 }
125
TEST_F(CtSerializationTest,FailsDecodingInvalidSCTList)126 TEST_F(CtSerializationTest, FailsDecodingInvalidSCTList) {
127 // A list with one item that's too short
128 base::StringPiece encoded("\x0\xa\x0\x3\x61\x62\x63\x0\x5\x64\x65\x66", 12);
129 std::vector<base::StringPiece> decoded;
130
131 ASSERT_FALSE(ct::DecodeSCTList(&encoded, &decoded));
132 }
133
TEST_F(CtSerializationTest,DecodesSignedCertificateTimestamp)134 TEST_F(CtSerializationTest, DecodesSignedCertificateTimestamp) {
135 std::string encoded_test_sct(ct::GetTestSignedCertificateTimestamp());
136 base::StringPiece encoded_sct(encoded_test_sct);
137
138 scoped_refptr<ct::SignedCertificateTimestamp> sct;
139 ASSERT_TRUE(ct::DecodeSignedCertificateTimestamp(&encoded_sct, &sct));
140 EXPECT_EQ(0, sct->version);
141 EXPECT_EQ(ct::GetTestPublicKeyId(), sct->log_id);
142 base::Time expected_time = base::Time::UnixEpoch() +
143 base::TimeDelta::FromMilliseconds(1365181456089);
144 EXPECT_EQ(expected_time, sct->timestamp);
145 // Subtracting 4 bytes for signature data (hash & sig algs),
146 // actual signature data should be 71 bytes.
147 EXPECT_EQ((size_t) 71, sct->signature.signature_data.size());
148 EXPECT_TRUE(sct->extensions.empty());
149 }
150
TEST_F(CtSerializationTest,FailsDecodingInvalidSignedCertificateTimestamp)151 TEST_F(CtSerializationTest, FailsDecodingInvalidSignedCertificateTimestamp) {
152 // Invalid version
153 base::StringPiece invalid_version_sct("\x2\x0", 2);
154 scoped_refptr<ct::SignedCertificateTimestamp> sct;
155
156 ASSERT_FALSE(
157 ct::DecodeSignedCertificateTimestamp(&invalid_version_sct, &sct));
158
159 // Valid version, invalid length (missing data)
160 base::StringPiece invalid_length_sct("\x0\xa\xb\xc", 4);
161 ASSERT_FALSE(
162 ct::DecodeSignedCertificateTimestamp(&invalid_length_sct, &sct));
163 }
164
TEST_F(CtSerializationTest,EncodesValidSignedTreeHead)165 TEST_F(CtSerializationTest, EncodesValidSignedTreeHead) {
166 ct::SignedTreeHead signed_tree_head;
167 GetSignedTreeHead(&signed_tree_head);
168
169 std::string encoded;
170 ct::EncodeTreeHeadSignature(signed_tree_head, &encoded);
171 // Expected size is 50 bytes:
172 // Byte 0 is version, byte 1 is signature type
173 // Bytes 2-9 are timestamp
174 // Bytes 10-17 are tree size
175 // Bytes 18-49 are sha256 root hash
176 ASSERT_EQ(50u, encoded.length());
177 std::string expected_buffer(
178 "\x0\x1\x0\x0\x1\x45\x3c\x5f\xb8\x35\x0\x0\x0\x0\x0\x0\x0\x15", 18);
179 expected_buffer.append(ct::GetSampleSTHSHA256RootHash());
180 ASSERT_EQ(expected_buffer, encoded);
181 }
182
183 } // namespace net
184
185