components/update_client/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/update_client/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/update_client/component_patcher.h"
  16 #include "components/update_client/update_client.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 update_client {
  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     const 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(
  64     const base::DictionaryValue* command_args,
  65     const base::FilePath& input_dir,
  66     const base::FilePath& unpack_dir,
  67     const scoped_refptr<CrxInstaller>& installer,
  68     const ComponentUnpacker::Callback& callback,
  69     const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
  70   callback_ = callback;
  71   task_runner_ = task_runner;
  72   std::string output_rel_path;
  73   if (!command_args->GetString(kOutput, &output_rel_path) ||
  74       !command_args->GetString(kSha256, &output_sha256_)) {
  75     DoneRunning(ComponentUnpacker::kDeltaBadCommands, 0);
  76     return;
  77   }
  78
  79   output_abs_path_ =
  80       unpack_dir.Append(base::FilePath::FromUTF8Unsafe(output_rel_path));
  81   ComponentUnpacker::Error parse_result =
  82       DoParseArguments(command_args, input_dir, installer);
  83   if (parse_result != ComponentUnpacker::kNone) {
  84     DoneRunning(parse_result, 0);
  85     return;
  86   }
  87
  88   const base::FilePath parent = output_abs_path_.DirName();
  89   if (!base::DirectoryExists(parent)) {
  90     if (!base::CreateDirectory(parent)) {
  91       DoneRunning(ComponentUnpacker::kIoError, 0);
  92       return;
  93     }
  94   }
  95
  96   DoRun(base::Bind(&DeltaUpdateOp::DoneRunning,
  97                    scoped_refptr<DeltaUpdateOp>(this)));
  98 }
  99
 100 void DeltaUpdateOp::DoneRunning(ComponentUnpacker::Error error,
 101                                 int extended_error) {
 102   if (error == ComponentUnpacker::kNone)
 103     error = CheckHash();
 104   task_runner_->PostTask(FROM_HERE,
 105                          base::Bind(callback_, error, extended_error));
 106   callback_.Reset();
 107 }
 108
 109 // Uses the hash as a checksum to confirm that the file now residing in the
 110 // output directory probably has the contents it should.
 111 ComponentUnpacker::Error DeltaUpdateOp::CheckHash() {
 112   std::vector<uint8_t> expected_hash;
 113   if (!base::HexStringToBytes(output_sha256_, &expected_hash) ||
 114       expected_hash.size() != crypto::kSHA256Length)
 115     return ComponentUnpacker::kDeltaVerificationFailure;
 116
 117   base::MemoryMappedFile output_file_mmapped;
 118   if (!output_file_mmapped.Initialize(output_abs_path_))
 119     return ComponentUnpacker::kDeltaVerificationFailure;
 120
 121   uint8_t actual_hash[crypto::kSHA256Length] = {0};
 122   const scoped_ptr<SecureHash> hasher(SecureHash::Create(SecureHash::SHA256));
 123   hasher->Update(output_file_mmapped.data(), output_file_mmapped.length());
 124   hasher->Finish(actual_hash, sizeof(actual_hash));
 125   if (memcmp(actual_hash, &expected_hash[0], sizeof(actual_hash)))
 126     return ComponentUnpacker::kDeltaVerificationFailure;
 127
 128   return ComponentUnpacker::kNone;
 129 }
 130
 131 scoped_refptr<base::SequencedTaskRunner> DeltaUpdateOp::GetTaskRunner() {
 132   return task_runner_;
 133 }
 134
 135 DeltaUpdateOpCopy::DeltaUpdateOpCopy() {
 136 }
 137
 138 DeltaUpdateOpCopy::~DeltaUpdateOpCopy() {
 139 }
 140
 141 ComponentUnpacker::Error DeltaUpdateOpCopy::DoParseArguments(
 142     const base::DictionaryValue* command_args,
 143     const base::FilePath& input_dir,
 144     const scoped_refptr<CrxInstaller>& installer) {
 145   std::string input_rel_path;
 146   if (!command_args->GetString(kInput, &input_rel_path))
 147     return ComponentUnpacker::kDeltaBadCommands;
 148
 149   if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
 150     return ComponentUnpacker::kDeltaMissingExistingFile;
 151
 152   return ComponentUnpacker::kNone;
 153 }
 154
 155 void DeltaUpdateOpCopy::DoRun(const ComponentUnpacker::Callback& callback) {
 156   if (!base::CopyFile(input_abs_path_, output_abs_path_))
 157     callback.Run(ComponentUnpacker::kDeltaOperationFailure, 0);
 158   else
 159     callback.Run(ComponentUnpacker::kNone, 0);
 160 }
 161
 162 DeltaUpdateOpCreate::DeltaUpdateOpCreate() {
 163 }
 164
 165 DeltaUpdateOpCreate::~DeltaUpdateOpCreate() {
 166 }
 167
 168 ComponentUnpacker::Error DeltaUpdateOpCreate::DoParseArguments(
 169     const base::DictionaryValue* command_args,
 170     const base::FilePath& input_dir,
 171     const scoped_refptr<CrxInstaller>& installer) {
 172   std::string patch_rel_path;
 173   if (!command_args->GetString(kPatch, &patch_rel_path))
 174     return ComponentUnpacker::kDeltaBadCommands;
 175
 176   patch_abs_path_ =
 177       input_dir.Append(base::FilePath::FromUTF8Unsafe(patch_rel_path));
 178
 179   return ComponentUnpacker::kNone;
 180 }
 181
 182 void DeltaUpdateOpCreate::DoRun(const ComponentUnpacker::Callback& callback) {
 183   if (!base::Move(patch_abs_path_, output_abs_path_))
 184     callback.Run(ComponentUnpacker::kDeltaOperationFailure, 0);
 185   else
 186     callback.Run(ComponentUnpacker::kNone, 0);
 187 }
 188
 189 DeltaUpdateOpPatch::DeltaUpdateOpPatch(
 190     const std::string& operation,
 191     scoped_refptr<OutOfProcessPatcher> out_of_process_patcher)
 192     : operation_(operation), out_of_process_patcher_(out_of_process_patcher) {
 193   DCHECK(operation == kBsdiff || operation == kCourgette);
 194 }
 195
 196 DeltaUpdateOpPatch::~DeltaUpdateOpPatch() {
 197 }
 198
 199 ComponentUnpacker::Error DeltaUpdateOpPatch::DoParseArguments(
 200     const base::DictionaryValue* command_args,
 201     const base::FilePath& input_dir,
 202     const scoped_refptr<CrxInstaller>& installer) {
 203   std::string patch_rel_path;
 204   std::string input_rel_path;
 205   if (!command_args->GetString(kPatch, &patch_rel_path) ||
 206       !command_args->GetString(kInput, &input_rel_path))
 207     return ComponentUnpacker::kDeltaBadCommands;
 208
 209   if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
 210     return ComponentUnpacker::kDeltaMissingExistingFile;
 211
 212   patch_abs_path_ =
 213       input_dir.Append(base::FilePath::FromUTF8Unsafe(patch_rel_path));
 214
 215   return ComponentUnpacker::kNone;
 216 }
 217
 218 void DeltaUpdateOpPatch::DoRun(const ComponentUnpacker::Callback& callback) {
 219   if (out_of_process_patcher_.get()) {
 220     out_of_process_patcher_->Patch(
 221         operation_, GetTaskRunner(), input_abs_path_, patch_abs_path_,
 222         output_abs_path_,
 223         base::Bind(&DeltaUpdateOpPatch::DonePatching, this, callback));
 224     return;
 225   }
 226
 227   if (operation_ == kBsdiff) {
 228     DonePatching(callback,
 229                  courgette::ApplyBinaryPatch(input_abs_path_, patch_abs_path_,
 230                                              output_abs_path_));
 231   } else if (operation_ == kCourgette) {
 232     DonePatching(callback, courgette::ApplyEnsemblePatch(
 233                                input_abs_path_.value().c_str(),
 234                                patch_abs_path_.value().c_str(),
 235                                output_abs_path_.value().c_str()));
 236   } else {
 237     NOTREACHED();
 238   }
 239 }
 240
 241 void DeltaUpdateOpPatch::DonePatching(
 242     const ComponentUnpacker::Callback& callback,
 243     int result) {
 244   if (operation_ == kBsdiff) {
 245     if (result == courgette::OK) {
 246       callback.Run(ComponentUnpacker::kNone, 0);
 247     } else {
 248       callback.Run(ComponentUnpacker::kDeltaOperationFailure,
 249                    result + kBsdiffErrorOffset);
 250     }
 251   } else if (operation_ == kCourgette) {
 252     if (result == courgette::C_OK) {
 253       callback.Run(ComponentUnpacker::kNone, 0);
 254     } else {
 255       callback.Run(ComponentUnpacker::kDeltaOperationFailure,
 256                    result + kCourgetteErrorOffset);
 257     }
 258   } else {
 259     NOTREACHED();
 260   }
 261 }
 262
 263 }  // namespace update_client