chrome/browser/extensions/api/networking_private/crypto_verify_impl.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 "chrome/browser/extensions/api/networking_private/crypto_verify_impl.h"
   6
   7 #include "base/base64.h"
   8 #include "base/bind.h"
   9 #include "base/bind_helpers.h"
  10 #include "base/sequenced_task_runner.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/string_util.h"
  13 #include "base/thread_task_runner_handle.h"
  14 #include "base/threading/sequenced_worker_pool.h"
  15 #include "chrome/browser/extensions/api/networking_private/networking_private_api.h"
  16 #include "chrome/browser/extensions/api/networking_private/networking_private_credentials_getter.h"
  17 #include "chrome/browser/extensions/api/networking_private/networking_private_service_client.h"
  18 #include "chrome/common/extensions/api/networking_private.h"
  19 #include "chrome/common/extensions/api/networking_private/networking_private_crypto.h"
  20 #include "content/public/browser/browser_thread.h"
  21
  22 namespace extensions {
  23
  24 namespace {
  25
  26 const char kCryptoVerifySequenceTokenName[] = "CryptoVerify";
  27
  28 // Called from a blocking pool task runner. Returns true and sets |verified| if
  29 // able to decode the credentials, otherwise sets |verified| to false and
  30 // returns false.
  31 bool DecodeAndVerifyCredentials(
  32     const CryptoVerifyImpl::Credentials& credentials,
  33     bool* verified) {
  34   std::string decoded_signed_data;
  35   if (!base::Base64Decode(credentials.signed_data, &decoded_signed_data)) {
  36     LOG(ERROR) << "Failed to decode signed data";
  37     *verified = false;
  38     return false;
  39   }
  40   *verified = networking_private_crypto::VerifyCredentials(
  41       credentials.certificate, decoded_signed_data, credentials.unsigned_data,
  42       credentials.device_bssid);
  43   return true;
  44 }
  45
  46 void VerifyDestinationCompleted(
  47     const CryptoVerifyImpl::BoolCallback& success_callback,
  48     const CryptoVerifyImpl::FailureCallback& failure_callback,
  49     bool* verified,
  50     bool success) {
  51   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  52   if (!success)
  53     failure_callback.Run(networking_private::kErrorEncryptionError);
  54   else
  55     success_callback.Run(*verified);
  56 }
  57
  58 // Called from a blocking pool task runner. Returns |data| encoded using
  59 // |credentials| on success, or an empty string on failure.
  60 std::string DoVerifyAndEncryptData(
  61     const CryptoVerifyImpl::Credentials& credentials,
  62     const std::string& data) {
  63   bool verified;
  64   if (!DecodeAndVerifyCredentials(credentials, &verified) || !verified)
  65     return std::string();
  66
  67   std::string decoded_public_key;
  68   if (!base::Base64Decode(credentials.public_key, &decoded_public_key)) {
  69     LOG(ERROR) << "Failed to decode public key";
  70     return std::string();
  71   }
  72
  73   std::vector<uint8_t> public_key_data(decoded_public_key.begin(),
  74                                        decoded_public_key.end());
  75   std::vector<uint8_t> ciphertext;
  76   if (!networking_private_crypto::EncryptByteString(public_key_data, data,
  77                                                     &ciphertext)) {
  78     LOG(ERROR) << "Failed to encrypt data";
  79     return std::string();
  80   }
  81
  82   std::string base64_encoded_ciphertext;
  83   base::Base64Encode(std::string(ciphertext.begin(), ciphertext.end()),
  84                      &base64_encoded_ciphertext);
  85   return base64_encoded_ciphertext;
  86 }
  87
  88 void VerifyAndEncryptDataCompleted(
  89     const CryptoVerifyImpl::StringCallback& success_callback,
  90     const CryptoVerifyImpl::FailureCallback& failure_callback,
  91     const std::string& encrypted_data) {
  92   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  93   if (encrypted_data.empty())
  94     failure_callback.Run(networking_private::kErrorEncryptionError);
  95   else
  96     success_callback.Run(encrypted_data);
  97 }
  98
  99 // Called when NetworkingPrivateCredentialsGetter completes (from an arbitrary
 100 // thread). Posts the result to the UI thread.
 101 void CredentialsGetterCompleted(
 102     const CryptoVerifyImpl::StringCallback& success_callback,
 103     const CryptoVerifyImpl::FailureCallback& failure_callback,
 104     const std::string& key_data,
 105     const std::string& error) {
 106   if (!error.empty()) {
 107     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
 108                                      base::Bind(failure_callback, error));
 109   } else {
 110     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
 111                                      base::Bind(success_callback, key_data));
 112   }
 113 }
 114
 115 // Called from a blocking pool task runner. Returns true if
 116 // NetworkingPrivateCredentialsGetter is successfully started (which will
 117 // invoke the appropriate callback when completed), or false if unable
 118 // to start the getter (credentials or public key decode failed).
 119 bool DoVerifyAndEncryptCredentials(
 120     const std::string& guid,
 121     const CryptoVerifyImpl::Credentials& credentials,
 122     const CryptoVerifyImpl::StringCallback& success_callback,
 123     const CryptoVerifyImpl::FailureCallback& failure_callback) {
 124   bool verified;
 125   if (!DecodeAndVerifyCredentials(credentials, &verified) || !verified)
 126     return false;
 127
 128   std::string decoded_public_key;
 129   if (!base::Base64Decode(credentials.public_key, &decoded_public_key)) {
 130     LOG(ERROR) << "Failed to decode public key";
 131     return false;
 132   }
 133
 134   // Start getting credentials. CredentialsGetterCompleted will be called on
 135   // completion. On Windows it will be called from a different thread after
 136   // |credentials_getter| is deleted.
 137   scoped_ptr<NetworkingPrivateCredentialsGetter> credentials_getter(
 138       NetworkingPrivateCredentialsGetter::Create());
 139   credentials_getter->Start(guid, decoded_public_key,
 140                             base::Bind(&CredentialsGetterCompleted,
 141                                        success_callback, failure_callback));
 142   return true;
 143 }
 144
 145 void VerifyAndEncryptCredentialsCompleted(
 146     const CryptoVerifyImpl::FailureCallback& failure_callback,
 147     bool succeeded) {
 148   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 149   // If VerifyAndEncryptCredentials succeeded, then the appropriate callback
 150   // will be triggered from CredentialsGetterCompleted.
 151   if (succeeded)
 152     return;
 153   failure_callback.Run(networking_private::kErrorEncryptionError);
 154 }
 155
 156 }  // namespace
 157
 158 CryptoVerifyImpl::Credentials::Credentials(
 159     const VerificationProperties& properties) {
 160   certificate = properties.certificate;
 161   signed_data = properties.signed_data;
 162
 163   std::vector<std::string> data_parts;
 164   data_parts.push_back(properties.device_ssid);
 165   data_parts.push_back(properties.device_serial);
 166   data_parts.push_back(properties.device_bssid);
 167   data_parts.push_back(properties.public_key);
 168   data_parts.push_back(properties.nonce);
 169   unsigned_data = JoinString(data_parts, ",");
 170
 171   device_bssid = properties.device_bssid;
 172   public_key = properties.public_key;
 173 }
 174
 175 CryptoVerifyImpl::Credentials::~Credentials() {
 176 }
 177
 178 CryptoVerifyImpl::CryptoVerifyImpl() {
 179   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 180   base::SequencedWorkerPool::SequenceToken sequence_token =
 181       content::BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
 182           kCryptoVerifySequenceTokenName);
 183   blocking_pool_task_runner_ =
 184       content::BrowserThread::GetBlockingPool()
 185           ->GetSequencedTaskRunnerWithShutdownBehavior(
 186               sequence_token, base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 187 }
 188
 189 CryptoVerifyImpl::~CryptoVerifyImpl() {
 190   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 191 }
 192
 193 void CryptoVerifyImpl::VerifyDestination(
 194     const VerificationProperties& verification_properties,
 195     const BoolCallback& success_callback,
 196     const FailureCallback& failure_callback) {
 197   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 198   Credentials credentials(verification_properties);
 199   bool* verified = new bool;
 200   base::PostTaskAndReplyWithResult(
 201       blocking_pool_task_runner_.get(), FROM_HERE,
 202       base::Bind(&DecodeAndVerifyCredentials, credentials, verified),
 203       base::Bind(&VerifyDestinationCompleted, success_callback,
 204                  failure_callback, base::Owned(verified)));
 205 }
 206
 207 void CryptoVerifyImpl::VerifyAndEncryptCredentials(
 208     const std::string& guid,
 209     const VerificationProperties& verification_properties,
 210     const StringCallback& success_callback,
 211     const FailureCallback& failure_callback) {
 212   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 213   Credentials credentials(verification_properties);
 214   base::PostTaskAndReplyWithResult(
 215       blocking_pool_task_runner_.get(), FROM_HERE,
 216       base::Bind(&DoVerifyAndEncryptCredentials, guid, credentials,
 217                  success_callback, failure_callback),
 218       base::Bind(&VerifyAndEncryptCredentialsCompleted, failure_callback));
 219 }
 220
 221 void CryptoVerifyImpl::VerifyAndEncryptData(
 222     const VerificationProperties& verification_properties,
 223     const std::string& data,
 224     const StringCallback& success_callback,
 225     const FailureCallback& failure_callback) {
 226   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 227   Credentials credentials(verification_properties);
 228   base::PostTaskAndReplyWithResult(
 229       blocking_pool_task_runner_.get(), FROM_HERE,
 230       base::Bind(&DoVerifyAndEncryptData, credentials, data),
 231       base::Bind(&VerifyAndEncryptDataCompleted, success_callback,
 232                  failure_callback));
 233 }
 234
 235 }  // namespace extensions