components/component_updater/component_patcher_operation.cc

   1 // Copyright 2014 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 "components/component_updater/component_patcher_operation.h"
   6
   7 #include <stdint.h>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "base/files/file_util.h"
  12 #include "base/files/memory_mapped_file.h"
  13 #include "base/location.h"
  14 #include "base/strings/string_number_conversions.h"
  15 #include "components/component_updater/component_patcher.h"
  16 #include "components/component_updater/component_updater_service.h"
  17 #include "courgette/courgette.h"
  18 #include "courgette/third_party/bsdiff.h"
  19 #include "crypto/secure_hash.h"
  20 #include "crypto/sha2.h"
  21 #include "crypto/signature_verifier.h"
  22
  23 using crypto::SecureHash;
  24
  25 namespace component_updater {
  26
  27 namespace {
  28
  29 const char kOutput[] = "output";
  30 const char kSha256[] = "sha256";
  31
  32 // The integer offset disambiguates between overlapping error ranges.
  33 const int kCourgetteErrorOffset = 300;
  34 const int kBsdiffErrorOffset = 600;
  35
  36 }  // namespace
  37
  38 const char kOp[] = "op";
  39 const char kBsdiff[] = "bsdiff";
  40 const char kCourgette[] = "courgette";
  41 const char kInput[] = "input";
  42 const char kPatch[] = "patch";
  43
  44 DeltaUpdateOp* CreateDeltaUpdateOp(
  45     const std::string& operation,
  46     scoped_refptr<OutOfProcessPatcher> out_of_process_patcher) {
  47   if (operation == "copy") {
  48     return new DeltaUpdateOpCopy();
  49   } else if (operation == "create") {
  50     return new DeltaUpdateOpCreate();
  51   } else if (operation == "bsdiff" || operation == "courgette") {
  52     return new DeltaUpdateOpPatch(operation, out_of_process_patcher);
  53   }
  54   return NULL;
  55 }
  56
  57 DeltaUpdateOp::DeltaUpdateOp() {
  58 }
  59
  60 DeltaUpdateOp::~DeltaUpdateOp() {
  61 }
  62
  63 void DeltaUpdateOp::Run(const base::DictionaryValue* command_args,
  64                         const base::FilePath& input_dir,
  65                         const base::FilePath& unpack_dir,
  66                         ComponentInstaller* installer,
  67                         const ComponentUnpacker::Callback& callback,
  68                         scoped_refptr<base::SequencedTaskRunner> task_runner) {
  69   callback_ = callback;
  70   task_runner_ = task_runner;
  71   std::string output_rel_path;
  72   if (!command_args->GetString(kOutput, &output_rel_path) ||
  73       !command_args->GetString(kSha256, &output_sha256_)) {
  74     DoneRunning(ComponentUnpacker::kDeltaBadCommands, 0);
  75     return;
  76   }
  77
  78   output_abs_path_ =
  79       unpack_dir.Append(base::FilePath::FromUTF8Unsafe(output_rel_path));
  80   ComponentUnpacker::Error parse_result =
  81       DoParseArguments(command_args, input_dir, installer);
  82   if (parse_result != ComponentUnpacker::kNone) {
  83     DoneRunning(parse_result, 0);
  84     return;
  85   }
  86
  87   const base::FilePath parent = output_abs_path_.DirName();
  88   if (!base::DirectoryExists(parent)) {
  89     if (!base::CreateDirectory(parent)) {
  90       DoneRunning(ComponentUnpacker::kIoError, 0);
  91       return;
  92     }
  93   }
  94
  95   DoRun(base::Bind(&DeltaUpdateOp::DoneRunning,
  96                    scoped_refptr<DeltaUpdateOp>(this)));
  97 }
  98
  99 void DeltaUpdateOp::DoneRunning(ComponentUnpacker::Error error,
 100                                 int extended_error) {
 101   if (error == ComponentUnpacker::kNone)
 102     error = CheckHash();
 103   task_runner_->PostTask(FROM_HERE,
 104                          base::Bind(callback_, error, extended_error));
 105   callback_.Reset();
 106 }
 107
 108 // Uses the hash as a checksum to confirm that the file now residing in the
 109 // output directory probably has the contents it should.
 110 ComponentUnpacker::Error DeltaUpdateOp::CheckHash() {
 111   std::vector<uint8_t> expected_hash;
 112   if (!base::HexStringToBytes(output_sha256_, &expected_hash) ||
 113       expected_hash.size() != crypto::kSHA256Length)
 114     return ComponentUnpacker::kDeltaVerificationFailure;
 115
 116   base::MemoryMappedFile output_file_mmapped;
 117   if (!output_file_mmapped.Initialize(output_abs_path_))
 118     return ComponentUnpacker::kDeltaVerificationFailure;
 119
 120   uint8_t actual_hash[crypto::kSHA256Length] = {0};
 121   const scoped_ptr<SecureHash> hasher(SecureHash::Create(SecureHash::SHA256));
 122   hasher->Update(output_file_mmapped.data(), output_file_mmapped.length());
 123   hasher->Finish(actual_hash, sizeof(actual_hash));
 124   if (memcmp(actual_hash, &expected_hash[0], sizeof(actual_hash)))
 125     return ComponentUnpacker::kDeltaVerificationFailure;
 126
 127   return ComponentUnpacker::kNone;
 128 }
 129
 130 scoped_refptr<base::SequencedTaskRunner> DeltaUpdateOp::GetTaskRunner() {
 131   return task_runner_;
 132 }
 133
 134 DeltaUpdateOpCopy::DeltaUpdateOpCopy() {
 135 }
 136
 137 DeltaUpdateOpCopy::~DeltaUpdateOpCopy() {
 138 }
 139
 140 ComponentUnpacker::Error DeltaUpdateOpCopy::DoParseArguments(
 141     const base::DictionaryValue* command_args,
 142     const base::FilePath& input_dir,
 143     ComponentInstaller* installer) {
 144   std::string input_rel_path;
 145   if (!command_args->GetString(kInput, &input_rel_path))
 146     return ComponentUnpacker::kDeltaBadCommands;
 147
 148   if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
 149     return ComponentUnpacker::kDeltaMissingExistingFile;
 150
 151   return ComponentUnpacker::kNone;
 152 }
 153
 154 void DeltaUpdateOpCopy::DoRun(const ComponentUnpacker::Callback& callback) {
 155   if (!base::CopyFile(input_abs_path_, output_abs_path_))
 156     callback.Run(ComponentUnpacker::kDeltaOperationFailure, 0);
 157   else
 158     callback.Run(ComponentUnpacker::kNone, 0);
 159 }
 160
 161 DeltaUpdateOpCreate::DeltaUpdateOpCreate() {
 162 }
 163
 164 DeltaUpdateOpCreate::~DeltaUpdateOpCreate() {
 165 }
 166
 167 ComponentUnpacker::Error DeltaUpdateOpCreate::DoParseArguments(
 168     const base::DictionaryValue* command_args,
 169     const base::FilePath& input_dir,
 170     ComponentInstaller* installer) {
 171   std::string patch_rel_path;
 172   if (!command_args->GetString(kPatch, &patch_rel_path))
 173     return ComponentUnpacker::kDeltaBadCommands;
 174
 175   patch_abs_path_ =
 176       input_dir.Append(base::FilePath::FromUTF8Unsafe(patch_rel_path));
 177
 178   return ComponentUnpacker::kNone;
 179 }
 180
 181 void DeltaUpdateOpCreate::DoRun(const ComponentUnpacker::Callback& callback) {
 182   if (!base::Move(patch_abs_path_, output_abs_path_))
 183     callback.Run(ComponentUnpacker::kDeltaOperationFailure, 0);
 184   else
 185     callback.Run(ComponentUnpacker::kNone, 0);
 186 }
 187
 188 DeltaUpdateOpPatch::DeltaUpdateOpPatch(
 189     const std::string& operation,
 190     scoped_refptr<OutOfProcessPatcher> out_of_process_patcher)
 191     : operation_(operation), out_of_process_patcher_(out_of_process_patcher) {
 192   DCHECK(operation == kBsdiff || operation == kCourgette);
 193 }
 194
 195 DeltaUpdateOpPatch::~DeltaUpdateOpPatch() {
 196 }
 197
 198 ComponentUnpacker::Error DeltaUpdateOpPatch::DoParseArguments(
 199     const base::DictionaryValue* command_args,
 200     const base::FilePath& input_dir,
 201     ComponentInstaller* installer) {
 202   std::string patch_rel_path;
 203   std::string input_rel_path;
 204   if (!command_args->GetString(kPatch, &patch_rel_path) ||
 205       !command_args->GetString(kInput, &input_rel_path))
 206     return ComponentUnpacker::kDeltaBadCommands;
 207
 208   if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
 209     return ComponentUnpacker::kDeltaMissingExistingFile;
 210
 211   patch_abs_path_ =
 212       input_dir.Append(base::FilePath::FromUTF8Unsafe(patch_rel_path));
 213
 214   return ComponentUnpacker::kNone;
 215 }
 216
 217 void DeltaUpdateOpPatch::DoRun(const ComponentUnpacker::Callback& callback) {
 218   if (out_of_process_patcher_.get()) {
 219     out_of_process_patcher_->Patch(
 220         operation_,
 221         GetTaskRunner(),
 222         input_abs_path_,
 223         patch_abs_path_,
 224         output_abs_path_,
 225         base::Bind(&DeltaUpdateOpPatch::DonePatching, this, callback));
 226     return;
 227   }
 228
 229   if (operation_ == kBsdiff) {
 230     DonePatching(callback,
 231                  courgette::ApplyBinaryPatch(
 232                      input_abs_path_, patch_abs_path_, output_abs_path_));
 233   } else if (operation_ == kCourgette) {
 234     DonePatching(
 235         callback,
 236         courgette::ApplyEnsemblePatch(input_abs_path_.value().c_str(),
 237                                       patch_abs_path_.value().c_str(),
 238                                       output_abs_path_.value().c_str()));
 239   } else {
 240     NOTREACHED();
 241   }
 242 }
 243
 244 void DeltaUpdateOpPatch::DonePatching(
 245     const ComponentUnpacker::Callback& callback,
 246     int result) {
 247   if (operation_ == kBsdiff) {
 248     if (result == courgette::OK) {
 249       callback.Run(ComponentUnpacker::kNone, 0);
 250     } else {
 251       callback.Run(ComponentUnpacker::kDeltaOperationFailure,
 252                    result + kBsdiffErrorOffset);
 253     }
 254   } else if (operation_ == kCourgette) {
 255     if (result == courgette::C_OK) {
 256       callback.Run(ComponentUnpacker::kNone, 0);
 257     } else {
 258       callback.Run(ComponentUnpacker::kDeltaOperationFailure,
 259                    result + kCourgetteErrorOffset);
 260     }
 261   } else {
 262     NOTREACHED();
 263   }
 264 }
 265
 266 }  // namespace component_updater