1 // 2 // Copyright (C) 2015 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_file.h" 18 19 #include <endian.h> 20 21 #include <algorithm> 22 23 #include "update_engine/common/hash_calculator.h" 24 #include "update_engine/payload_consumer/delta_performer.h" 25 #include "update_engine/payload_consumer/file_writer.h" 26 #include "update_engine/payload_consumer/payload_constants.h" 27 #include "update_engine/payload_generator/annotated_operation.h" 28 #include "update_engine/payload_generator/delta_diff_utils.h" 29 #include "update_engine/payload_generator/payload_signer.h" 30 31 using std::string; 32 using std::vector; 33 34 namespace chromeos_update_engine { 35 36 namespace { 37 38 struct DeltaObject { 39 DeltaObject(const string& in_name, const int in_type, const off_t in_size) 40 : name(in_name), 41 type(in_type), 42 size(in_size) {} 43 bool operator <(const DeltaObject& object) const { 44 return (size != object.size) ? (size < object.size) : (name < object.name); 45 } 46 string name; 47 int type; 48 off_t size; 49 }; 50 51 // Writes the uint64_t passed in in host-endian to the file as big-endian. 52 // Returns true on success. 53 bool WriteUint64AsBigEndian(FileWriter* writer, const uint64_t value) { 54 uint64_t value_be = htobe64(value); 55 TEST_AND_RETURN_FALSE(writer->Write(&value_be, sizeof(value_be))); 56 return true; 57 } 58 59 } // namespace 60 61 bool PayloadFile::Init(const PayloadGenerationConfig& config) { 62 TEST_AND_RETURN_FALSE(config.version.Validate()); 63 major_version_ = config.version.major; 64 manifest_.set_minor_version(config.version.minor); 65 66 if (!config.source.ImageInfoIsEmpty()) 67 *(manifest_.mutable_old_image_info()) = config.source.image_info; 68 69 if (!config.target.ImageInfoIsEmpty()) 70 *(manifest_.mutable_new_image_info()) = config.target.image_info; 71 72 manifest_.set_block_size(config.block_size); 73 return true; 74 } 75 76 bool PayloadFile::AddPartition(const PartitionConfig& old_conf, 77 const PartitionConfig& new_conf, 78 const vector<AnnotatedOperation>& aops) { 79 // Check partitions order for Chrome OS 80 if (major_version_ == kChromeOSMajorPayloadVersion) { 81 const vector<const char*> part_order = { kLegacyPartitionNameRoot, 82 kLegacyPartitionNameKernel }; 83 TEST_AND_RETURN_FALSE(part_vec_.size() < part_order.size()); 84 TEST_AND_RETURN_FALSE(new_conf.name == part_order[part_vec_.size()]); 85 } 86 Partition part; 87 part.name = new_conf.name; 88 part.aops = aops; 89 part.postinstall = new_conf.postinstall; 90 // Initialize the PartitionInfo objects if present. 91 if (!old_conf.path.empty()) 92 TEST_AND_RETURN_FALSE(diff_utils::InitializePartitionInfo(old_conf, 93 &part.old_info)); 94 TEST_AND_RETURN_FALSE(diff_utils::InitializePartitionInfo(new_conf, 95 &part.new_info)); 96 part_vec_.push_back(std::move(part)); 97 return true; 98 } 99 100 bool PayloadFile::WritePayload(const string& payload_file, 101 const string& data_blobs_path, 102 const string& private_key_path, 103 uint64_t* metadata_size_out) { 104 // Reorder the data blobs with the manifest_. 105 string ordered_blobs_path; 106 TEST_AND_RETURN_FALSE(utils::MakeTempFile( 107 "CrAU_temp_data.ordered.XXXXXX", 108 &ordered_blobs_path, 109 nullptr)); 110 ScopedPathUnlinker ordered_blobs_unlinker(ordered_blobs_path); 111 TEST_AND_RETURN_FALSE(ReorderDataBlobs(data_blobs_path, ordered_blobs_path)); 112 113 // Check that install op blobs are in order. 114 uint64_t next_blob_offset = 0; 115 for (const auto& part : part_vec_) { 116 for (const auto& aop : part.aops) { 117 if (!aop.op.has_data_offset()) 118 continue; 119 if (aop.op.data_offset() != next_blob_offset) { 120 LOG(FATAL) << "bad blob offset! " << aop.op.data_offset() << " != " 121 << next_blob_offset; 122 } 123 next_blob_offset += aop.op.data_length(); 124 } 125 } 126 127 // Copy the operations and partition info from the part_vec_ to the manifest. 128 manifest_.clear_install_operations(); 129 manifest_.clear_kernel_install_operations(); 130 manifest_.clear_partitions(); 131 for (const auto& part : part_vec_) { 132 if (major_version_ == kBrilloMajorPayloadVersion) { 133 PartitionUpdate* partition = manifest_.add_partitions(); 134 partition->set_partition_name(part.name); 135 if (part.postinstall.run) { 136 partition->set_run_postinstall(true); 137 if (!part.postinstall.path.empty()) 138 partition->set_postinstall_path(part.postinstall.path); 139 if (!part.postinstall.filesystem_type.empty()) 140 partition->set_filesystem_type(part.postinstall.filesystem_type); 141 partition->set_postinstall_optional(part.postinstall.optional); 142 } 143 for (const AnnotatedOperation& aop : part.aops) { 144 *partition->add_operations() = aop.op; 145 } 146 if (part.old_info.has_size() || part.old_info.has_hash()) 147 *(partition->mutable_old_partition_info()) = part.old_info; 148 if (part.new_info.has_size() || part.new_info.has_hash()) 149 *(partition->mutable_new_partition_info()) = part.new_info; 150 } else { 151 // major_version_ == kChromeOSMajorPayloadVersion 152 if (part.name == kLegacyPartitionNameKernel) { 153 for (const AnnotatedOperation& aop : part.aops) 154 *manifest_.add_kernel_install_operations() = aop.op; 155 if (part.old_info.has_size() || part.old_info.has_hash()) 156 *manifest_.mutable_old_kernel_info() = part.old_info; 157 if (part.new_info.has_size() || part.new_info.has_hash()) 158 *manifest_.mutable_new_kernel_info() = part.new_info; 159 } else { 160 for (const AnnotatedOperation& aop : part.aops) 161 *manifest_.add_install_operations() = aop.op; 162 if (part.old_info.has_size() || part.old_info.has_hash()) 163 *manifest_.mutable_old_rootfs_info() = part.old_info; 164 if (part.new_info.has_size() || part.new_info.has_hash()) 165 *manifest_.mutable_new_rootfs_info() = part.new_info; 166 } 167 } 168 } 169 170 // Signatures appear at the end of the blobs. Note the offset in the 171 // manifest_. 172 uint64_t signature_blob_length = 0; 173 if (!private_key_path.empty()) { 174 TEST_AND_RETURN_FALSE( 175 PayloadSigner::SignatureBlobLength(vector<string>(1, private_key_path), 176 &signature_blob_length)); 177 PayloadSigner::AddSignatureToManifest( 178 next_blob_offset, signature_blob_length, 179 major_version_ == kChromeOSMajorPayloadVersion, &manifest_); 180 } 181 182 // Serialize protobuf 183 string serialized_manifest; 184 TEST_AND_RETURN_FALSE(manifest_.AppendToString(&serialized_manifest)); 185 186 uint64_t metadata_size = 187 sizeof(kDeltaMagic) + 2 * sizeof(uint64_t) + serialized_manifest.size(); 188 189 LOG(INFO) << "Writing final delta file header..."; 190 DirectFileWriter writer; 191 TEST_AND_RETURN_FALSE_ERRNO(writer.Open(payload_file.c_str(), 192 O_WRONLY | O_CREAT | O_TRUNC, 193 0644) == 0); 194 ScopedFileWriterCloser writer_closer(&writer); 195 196 // Write header 197 TEST_AND_RETURN_FALSE_ERRNO(writer.Write(kDeltaMagic, sizeof(kDeltaMagic))); 198 199 // Write major version number 200 TEST_AND_RETURN_FALSE(WriteUint64AsBigEndian(&writer, major_version_)); 201 202 // Write protobuf length 203 TEST_AND_RETURN_FALSE(WriteUint64AsBigEndian(&writer, 204 serialized_manifest.size())); 205 206 // Write metadata signature size. 207 uint32_t metadata_signature_size = 0; 208 if (major_version_ == kBrilloMajorPayloadVersion) { 209 // Metadata signature has the same size as payload signature, because they 210 // are both the same kind of signature for the same kind of hash. 211 uint32_t metadata_signature_size = htobe32(signature_blob_length); 212 TEST_AND_RETURN_FALSE_ERRNO(writer.Write(&metadata_signature_size, 213 sizeof(metadata_signature_size))); 214 metadata_size += sizeof(metadata_signature_size); 215 // Set correct size instead of big endian size. 216 metadata_signature_size = signature_blob_length; 217 } 218 219 // Write protobuf 220 LOG(INFO) << "Writing final delta file protobuf... " 221 << serialized_manifest.size(); 222 TEST_AND_RETURN_FALSE_ERRNO( 223 writer.Write(serialized_manifest.data(), serialized_manifest.size())); 224 225 // Write metadata signature blob. 226 if (major_version_ == kBrilloMajorPayloadVersion && 227 !private_key_path.empty()) { 228 brillo::Blob metadata_hash, metadata_signature; 229 TEST_AND_RETURN_FALSE(HashCalculator::RawHashOfFile(payload_file, 230 metadata_size, 231 &metadata_hash)); 232 TEST_AND_RETURN_FALSE( 233 PayloadSigner::SignHashWithKeys(metadata_hash, 234 vector<string>(1, private_key_path), 235 &metadata_signature)); 236 TEST_AND_RETURN_FALSE_ERRNO( 237 writer.Write(metadata_signature.data(), metadata_signature.size())); 238 } 239 240 // Append the data blobs 241 LOG(INFO) << "Writing final delta file data blobs..."; 242 int blobs_fd = open(ordered_blobs_path.c_str(), O_RDONLY, 0); 243 ScopedFdCloser blobs_fd_closer(&blobs_fd); 244 TEST_AND_RETURN_FALSE(blobs_fd >= 0); 245 for (;;) { 246 vector<char> buf(1024 * 1024); 247 ssize_t rc = read(blobs_fd, buf.data(), buf.size()); 248 if (0 == rc) { 249 // EOF 250 break; 251 } 252 TEST_AND_RETURN_FALSE_ERRNO(rc > 0); 253 TEST_AND_RETURN_FALSE_ERRNO(writer.Write(buf.data(), rc)); 254 } 255 256 // Write payload signature blob. 257 if (!private_key_path.empty()) { 258 LOG(INFO) << "Signing the update..."; 259 brillo::Blob signature_blob; 260 TEST_AND_RETURN_FALSE(PayloadSigner::SignPayload( 261 payload_file, 262 vector<string>(1, private_key_path), 263 metadata_size, 264 metadata_signature_size, 265 metadata_size + metadata_signature_size + manifest_.signatures_offset(), 266 &signature_blob)); 267 TEST_AND_RETURN_FALSE_ERRNO( 268 writer.Write(signature_blob.data(), signature_blob.size())); 269 } 270 271 ReportPayloadUsage(metadata_size); 272 *metadata_size_out = metadata_size; 273 return true; 274 } 275 276 bool PayloadFile::ReorderDataBlobs( 277 const string& data_blobs_path, 278 const string& new_data_blobs_path) { 279 int in_fd = open(data_blobs_path.c_str(), O_RDONLY, 0); 280 TEST_AND_RETURN_FALSE_ERRNO(in_fd >= 0); 281 ScopedFdCloser in_fd_closer(&in_fd); 282 283 DirectFileWriter writer; 284 int rc = writer.Open( 285 new_data_blobs_path.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0644); 286 if (rc != 0) { 287 PLOG(ERROR) << "Error creating " << new_data_blobs_path; 288 return false; 289 } 290 ScopedFileWriterCloser writer_closer(&writer); 291 uint64_t out_file_size = 0; 292 293 for (auto& part : part_vec_) { 294 for (AnnotatedOperation& aop : part.aops) { 295 if (!aop.op.has_data_offset()) 296 continue; 297 CHECK(aop.op.has_data_length()); 298 brillo::Blob buf(aop.op.data_length()); 299 ssize_t rc = pread(in_fd, buf.data(), buf.size(), aop.op.data_offset()); 300 TEST_AND_RETURN_FALSE(rc == static_cast<ssize_t>(buf.size())); 301 302 // Add the hash of the data blobs for this operation 303 TEST_AND_RETURN_FALSE(AddOperationHash(&aop.op, buf)); 304 305 aop.op.set_data_offset(out_file_size); 306 TEST_AND_RETURN_FALSE_ERRNO(writer.Write(buf.data(), buf.size())); 307 out_file_size += buf.size(); 308 } 309 } 310 return true; 311 } 312 313 bool PayloadFile::AddOperationHash(InstallOperation* op, 314 const brillo::Blob& buf) { 315 brillo::Blob hash; 316 TEST_AND_RETURN_FALSE(HashCalculator::RawHashOfData(buf, &hash)); 317 op->set_data_sha256_hash(hash.data(), hash.size()); 318 return true; 319 } 320 321 void PayloadFile::ReportPayloadUsage(uint64_t metadata_size) const { 322 vector<DeltaObject> objects; 323 off_t total_size = 0; 324 325 for (const auto& part : part_vec_) { 326 for (const AnnotatedOperation& aop : part.aops) { 327 objects.push_back(DeltaObject(aop.name, 328 aop.op.type(), 329 aop.op.data_length())); 330 total_size += aop.op.data_length(); 331 } 332 } 333 334 objects.push_back(DeltaObject("<manifest-metadata>", 335 -1, 336 metadata_size)); 337 total_size += metadata_size; 338 339 std::sort(objects.begin(), objects.end()); 340 341 static const char kFormatString[] = "%6.2f%% %10jd %-10s %s\n"; 342 for (const DeltaObject& object : objects) { 343 fprintf( 344 stderr, kFormatString, 345 object.size * 100.0 / total_size, 346 static_cast<intmax_t>(object.size), 347 (object.type >= 0 ? InstallOperationTypeName( 348 static_cast<InstallOperation_Type>(object.type)) 349 : "-"), 350 object.name.c_str()); 351 } 352 fprintf(stderr, kFormatString, 353 100.0, static_cast<intmax_t>(total_size), "", "<total>"); 354 } 355 356 } // namespace chromeos_update_engine 357
