1 // 2 // Copyright (C) 2010 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #include "update_engine/payload_generator/payload_signer.h" 18 19 #include <string> 20 #include <vector> 21 22 #include <base/logging.h> 23 #include <gtest/gtest.h> 24 25 #include "update_engine/common/hash_calculator.h" 26 #include "update_engine/common/utils.h" 27 #include "update_engine/payload_consumer/payload_constants.h" 28 #include "update_engine/payload_consumer/payload_verifier.h" 29 #include "update_engine/payload_generator/payload_file.h" 30 #include "update_engine/update_metadata.pb.h" 31 32 using std::string; 33 using std::vector; 34 35 // Note: the test key was generated with the following command: 36 // openssl genrsa -out unittest_key.pem 2048 37 // The public-key version is created by the build system. 38 39 namespace chromeos_update_engine { 40 41 const char* kUnittestPrivateKeyPath = "unittest_key.pem"; 42 const char* kUnittestPublicKeyPath = "unittest_key.pub.pem"; 43 const char* kUnittestPrivateKey2Path = "unittest_key2.pem"; 44 const char* kUnittestPublicKey2Path = "unittest_key2.pub.pem"; 45 46 // Some data and its corresponding hash and signature: 47 const char kDataToSign[] = "This is some data to sign."; 48 49 // Generated by: 50 // echo -n 'This is some data to sign.' | openssl dgst -sha256 -binary | 51 // hexdump -v -e '" " 8/1 "0x%02x, " "\n"' 52 const uint8_t kDataHash[] = { 53 0x7a, 0x07, 0xa6, 0x44, 0x08, 0x86, 0x20, 0xa6, 54 0xc1, 0xf8, 0xd9, 0x02, 0x05, 0x63, 0x0d, 0xb7, 55 0xfc, 0x2b, 0xa0, 0xa9, 0x7c, 0x9d, 0x1d, 0x8c, 56 0x01, 0xf5, 0x78, 0x6d, 0xc5, 0x11, 0xb4, 0x06 57 }; 58 59 // Generated with openssl 1.0, which at the time of this writing, you need 60 // to download and install yourself. Here's my command: 61 // echo -n 'This is some data to sign.' | openssl dgst -sha256 -binary | 62 // ~/local/bin/openssl pkeyutl -sign -inkey unittest_key.pem -pkeyopt 63 // digest:sha256 | hexdump -v -e '" " 8/1 "0x%02x, " "\n"' 64 const uint8_t kDataSignature[] = { 65 0x9f, 0x86, 0x25, 0x8b, 0xf3, 0xcc, 0xe3, 0x95, 66 0x5f, 0x45, 0x83, 0xb2, 0x66, 0xf0, 0x2a, 0xcf, 67 0xb7, 0xaa, 0x52, 0x25, 0x7a, 0xdd, 0x9d, 0x65, 68 0xe5, 0xd6, 0x02, 0x4b, 0x37, 0x99, 0x53, 0x06, 69 0xc2, 0xc9, 0x37, 0x36, 0x25, 0x62, 0x09, 0x4f, 70 0x6b, 0x22, 0xf8, 0xb3, 0x89, 0x14, 0x98, 0x1a, 71 0xbc, 0x30, 0x90, 0x4a, 0x43, 0xf5, 0xea, 0x2e, 72 0xf0, 0xa4, 0xba, 0xc3, 0xa7, 0xa3, 0x44, 0x70, 73 0xd6, 0xc4, 0x89, 0xd8, 0x45, 0x71, 0xbb, 0xee, 74 0x59, 0x87, 0x3d, 0xd5, 0xe5, 0x40, 0x22, 0x3d, 75 0x73, 0x7e, 0x2a, 0x58, 0x93, 0x8e, 0xcb, 0x9c, 76 0xf2, 0xbb, 0x4a, 0xc9, 0xd2, 0x2c, 0x52, 0x42, 77 0xb0, 0xd1, 0x13, 0x22, 0xa4, 0x78, 0xc7, 0xc6, 78 0x3e, 0xf1, 0xdc, 0x4c, 0x7b, 0x2d, 0x40, 0xda, 79 0x58, 0xac, 0x4a, 0x11, 0x96, 0x3d, 0xa0, 0x01, 80 0xf6, 0x96, 0x74, 0xf6, 0x6c, 0x0c, 0x49, 0x69, 81 0x4e, 0xc1, 0x7e, 0x9f, 0x2a, 0x42, 0xdd, 0x15, 82 0x6b, 0x37, 0x2e, 0x3a, 0xa7, 0xa7, 0x6d, 0x91, 83 0x13, 0xe8, 0x59, 0xde, 0xfe, 0x99, 0x07, 0xd9, 84 0x34, 0x0f, 0x17, 0xb3, 0x05, 0x4c, 0xd2, 0xc6, 85 0x82, 0xb7, 0x38, 0x36, 0x63, 0x1d, 0x9e, 0x21, 86 0xa6, 0x32, 0xef, 0xf1, 0x65, 0xe6, 0xed, 0x95, 87 0x25, 0x9b, 0x61, 0xe0, 0xba, 0x86, 0xa1, 0x7f, 88 0xf8, 0xa5, 0x4a, 0x32, 0x1f, 0x15, 0x20, 0x8a, 89 0x41, 0xc5, 0xb0, 0xd9, 0x4a, 0xda, 0x85, 0xf3, 90 0xdc, 0xa0, 0x98, 0x5d, 0x1d, 0x18, 0x9d, 0x2e, 91 0x42, 0xea, 0x69, 0x13, 0x74, 0x3c, 0x74, 0xf7, 92 0x6d, 0x43, 0xb0, 0x63, 0x90, 0xdb, 0x04, 0xd5, 93 0x05, 0xc9, 0x73, 0x1f, 0x6c, 0xd6, 0xfa, 0x46, 94 0x4e, 0x0f, 0x33, 0x58, 0x5b, 0x0d, 0x1b, 0x55, 95 0x39, 0xb9, 0x0f, 0x43, 0x37, 0xc0, 0x06, 0x0c, 96 0x29, 0x93, 0x43, 0xc7, 0x43, 0xb9, 0xab, 0x7d 97 }; 98 99 namespace { 100 void SignSampleData(brillo::Blob* out_signature_blob, 101 const vector<string>& private_keys) { 102 brillo::Blob data_blob(std::begin(kDataToSign), 103 std::begin(kDataToSign) + strlen(kDataToSign)); 104 uint64_t length = 0; 105 EXPECT_TRUE(PayloadSigner::SignatureBlobLength(private_keys, &length)); 106 EXPECT_GT(length, 0U); 107 brillo::Blob hash_blob; 108 EXPECT_TRUE(HashCalculator::RawHashOfBytes(data_blob.data(), 109 data_blob.size(), 110 &hash_blob)); 111 EXPECT_TRUE(PayloadSigner::SignHashWithKeys( 112 hash_blob, 113 private_keys, 114 out_signature_blob)); 115 EXPECT_EQ(length, out_signature_blob->size()); 116 } 117 } // namespace 118 119 class PayloadSignerTest : public ::testing::Test { 120 protected: 121 void SetUp() override { 122 PayloadVerifier::PadRSA2048SHA256Hash(&padded_hash_data_); 123 } 124 125 void DoWriteAndLoadPayloadTest(const PayloadGenerationConfig& config) { 126 PayloadFile payload; 127 payload.Init(config); 128 string payload_path; 129 EXPECT_TRUE(utils::MakeTempFile("payload.XXXXXX", &payload_path, nullptr)); 130 ScopedPathUnlinker payload_path_unlinker(payload_path); 131 uint64_t metadata_size; 132 EXPECT_TRUE( 133 payload.WritePayload(payload_path, "/dev/null", "", &metadata_size)); 134 brillo::Blob payload_metadata_blob; 135 DeltaArchiveManifest manifest; 136 uint64_t load_metadata_size, load_major_version; 137 EXPECT_TRUE(PayloadSigner::LoadPayloadMetadata(payload_path, 138 &payload_metadata_blob, 139 &manifest, 140 &load_major_version, 141 &load_metadata_size, 142 nullptr)); 143 EXPECT_EQ(metadata_size, payload_metadata_blob.size()); 144 EXPECT_EQ(config.version.major, load_major_version); 145 EXPECT_EQ(metadata_size, load_metadata_size); 146 } 147 148 brillo::Blob padded_hash_data_{std::begin(kDataHash), std::end(kDataHash)}; 149 }; 150 151 TEST_F(PayloadSignerTest, LoadPayloadV1Test) { 152 PayloadGenerationConfig config; 153 config.version.major = kChromeOSMajorPayloadVersion; 154 DoWriteAndLoadPayloadTest(config); 155 } 156 157 TEST_F(PayloadSignerTest, LoadPayloadV2Test) { 158 PayloadGenerationConfig config; 159 config.version.major = kBrilloMajorPayloadVersion; 160 DoWriteAndLoadPayloadTest(config); 161 } 162 163 TEST_F(PayloadSignerTest, SignSimpleTextTest) { 164 brillo::Blob signature_blob; 165 SignSampleData(&signature_blob, {kUnittestPrivateKeyPath}); 166 167 // Check the signature itself 168 Signatures signatures; 169 EXPECT_TRUE(signatures.ParseFromArray(signature_blob.data(), 170 signature_blob.size())); 171 EXPECT_EQ(1, signatures.signatures_size()); 172 const Signatures_Signature& signature = signatures.signatures(0); 173 EXPECT_EQ(1U, signature.version()); 174 const string sig_data = signature.data(); 175 ASSERT_EQ(arraysize(kDataSignature), sig_data.size()); 176 for (size_t i = 0; i < arraysize(kDataSignature); i++) { 177 EXPECT_EQ(kDataSignature[i], static_cast<uint8_t>(sig_data[i])); 178 } 179 } 180 181 TEST_F(PayloadSignerTest, VerifyAllSignatureTest) { 182 brillo::Blob signature_blob; 183 SignSampleData(&signature_blob, 184 {kUnittestPrivateKeyPath, kUnittestPrivateKey2Path}); 185 186 // Either public key should pass the verification. 187 EXPECT_TRUE(PayloadVerifier::VerifySignature(signature_blob, 188 kUnittestPublicKeyPath, 189 padded_hash_data_)); 190 EXPECT_TRUE(PayloadVerifier::VerifySignature(signature_blob, 191 kUnittestPublicKey2Path, 192 padded_hash_data_)); 193 } 194 195 TEST_F(PayloadSignerTest, VerifySignatureTest) { 196 brillo::Blob signature_blob; 197 SignSampleData(&signature_blob, {kUnittestPrivateKeyPath}); 198 199 EXPECT_TRUE(PayloadVerifier::VerifySignature(signature_blob, 200 kUnittestPublicKeyPath, 201 padded_hash_data_)); 202 // Passing the invalid key should fail the verification. 203 EXPECT_FALSE(PayloadVerifier::VerifySignature(signature_blob, 204 kUnittestPublicKey2Path, 205 padded_hash_data_)); 206 } 207 208 TEST_F(PayloadSignerTest, SkipMetadataSignatureTest) { 209 string payload_path; 210 EXPECT_TRUE(utils::MakeTempFile("payload.XXXXXX", &payload_path, nullptr)); 211 ScopedPathUnlinker payload_path_unlinker(payload_path); 212 213 PayloadGenerationConfig config; 214 config.version.major = kBrilloMajorPayloadVersion; 215 PayloadFile payload; 216 EXPECT_TRUE(payload.Init(config)); 217 uint64_t metadata_size; 218 EXPECT_TRUE( 219 payload.WritePayload(payload_path, "/dev/null", "", &metadata_size)); 220 const vector<int> sizes = {256}; 221 brillo::Blob unsigned_payload_hash, unsigned_metadata_hash; 222 EXPECT_TRUE(PayloadSigner::HashPayloadForSigning( 223 payload_path, sizes, &unsigned_payload_hash, &unsigned_metadata_hash)); 224 EXPECT_TRUE(payload.WritePayload( 225 payload_path, "/dev/null", kUnittestPrivateKeyPath, &metadata_size)); 226 brillo::Blob signed_payload_hash, signed_metadata_hash; 227 EXPECT_TRUE(PayloadSigner::HashPayloadForSigning( 228 payload_path, sizes, &signed_payload_hash, &signed_metadata_hash)); 229 EXPECT_EQ(unsigned_payload_hash, signed_payload_hash); 230 EXPECT_EQ(unsigned_metadata_hash, signed_metadata_hash); 231 } 232 233 TEST_F(PayloadSignerTest, VerifySignedPayloadTest) { 234 string payload_path; 235 EXPECT_TRUE(utils::MakeTempFile("payload.XXXXXX", &payload_path, nullptr)); 236 ScopedPathUnlinker payload_path_unlinker(payload_path); 237 238 PayloadGenerationConfig config; 239 config.version.major = kBrilloMajorPayloadVersion; 240 PayloadFile payload; 241 EXPECT_TRUE(payload.Init(config)); 242 uint64_t metadata_size; 243 EXPECT_TRUE(payload.WritePayload( 244 payload_path, "/dev/null", kUnittestPrivateKeyPath, &metadata_size)); 245 EXPECT_TRUE(PayloadSigner::VerifySignedPayload(payload_path, 246 kUnittestPublicKeyPath)); 247 } 248 249 } // namespace chromeos_update_engine 250
