query backing device

src/device/device.hpp

@@ -78,7 +78,6 @@ namespace hw {
            return false;
     }
 
-
     class device {
     protected:
         std::string  name;
@@ -96,6 +95,12 @@ namespace hw {
             TRANSACTION_CREATE_FAKE,
             TRANSACTION_PARSE
         };
+        enum device_type
+        {
+          SOFTWARE = 0,
+          LEDGER = 1
+        };
+
 
         /* ======================================================================= */
         /*                              SETUP/TEARDOWN                             */
@@ -111,6 +116,8 @@ namespace hw {
 
         virtual bool set_mode(device_mode mode) = 0;
 
+        virtual device_type get_type() const = 0;
+
 
         /* ======================================================================= */
         /*  LOCKER                                                                 */

src/device/device_default.hpp

@@ -61,6 +61,8 @@ namespace hw {
  
             bool set_mode(device_mode mode) override;
 
+            device_type get_type() const {return device_type::SOFTWARE;};
+
             /* ======================================================================= */
             /*  LOCKER                                                                 */
             /* ======================================================================= */ 

src/device/device_ledger.hpp

@@ -144,6 +144,8 @@ namespace hw {
 
         bool set_mode(device_mode mode) override;
 
+        device_type get_type() const {return device_type::LEDGER;};
+
         /* ======================================================================= */
         /*  LOCKER                                                                 */
         /* ======================================================================= */ 

src/wallet/api/wallet.cpp

@@ -639,6 +639,11 @@ bool WalletImpl::recoverFromDevice(const std::string &path, const std::string &p
     return true;
 }
 
+Wallet::Device WalletImpl::getDeviceType() const
+{
+    return static_cast<Wallet::Device>(m_wallet->get_device_type());
+}
+
 bool WalletImpl::open(const std::string &path, const std::string &password)
 {
     clearStatus();

src/wallet/api/wallet.h

@@ -79,6 +79,7 @@ public:
     bool recoverFromDevice(const std::string &path,
                            const std::string &password,
                            const std::string &device_name);
+    Device getDeviceType() const;
     bool close(bool store = true);
     std::string seed() const override;
     std::string getSeedLanguage() const override;

src/wallet/api/wallet2_api.h

@@ -373,6 +373,10 @@ struct WalletListener
  */
 struct Wallet
 {
+    enum Device {
+        Device_Software = 0,
+        Device_Ledger = 1
+    };
 
     enum Status {
         Status_Ok,
@@ -911,6 +915,12 @@ struct Wallet
     virtual bool unlockKeysFile() = 0;
     //! returns true if the keys file is locked
     virtual bool isKeysFileLocked() = 0;
+
+    /*!
+     * \brief Queries backing device for wallet keys
+     * \return Device they are on
+     */
+    virtual Device getDeviceType() const = 0;
 };
 
 /**
@@ -1096,6 +1106,18 @@ struct WalletManager
      */
     virtual bool verifyWalletPassword(const std::string &keys_file_name, const std::string &password, bool no_spend_key, uint64_t kdf_rounds = 1) const = 0;
 
+    /*!
+     * \brief determine the key storage for the specified wallet file
+     * \param device_type     (OUT) wallet backend as enumerated in Wallet::Device
+     * \param keys_file_name  Keys file to verify password for
+     * \param password        Password to verify
+     * \return                true if password correct, else false
+     *
+     * for verification only - determines key storage hardware
+     *
+     */
+    virtual bool queryWalletDevice(Wallet::Device& device_type, const std::string &keys_file_name, const std::string &password, uint64_t kdf_rounds = 1) const = 0;
+
     /*!
      * \brief findWallets - searches for the wallet files by given path name recursively
      * \param path - starting point to search

src/wallet/api/wallet_manager.cpp

@@ -167,6 +167,14 @@ bool WalletManagerImpl::verifyWalletPassword(const std::string &keys_file_name,
 	    return tools::wallet2::verify_password(keys_file_name, password, no_spend_key, hw::get_device("default"), kdf_rounds);
 }
 
+bool WalletManagerImpl::queryWalletDevice(Wallet::Device& device_type, const std::string &keys_file_name, const std::string &password, uint64_t kdf_rounds) const
+{
+    hw::device::device_type type;
+    bool r = tools::wallet2::query_device(type, keys_file_name, password, kdf_rounds);
+    device_type = static_cast<Wallet::Device>(type);
+    return r;
+}
+
 std::vector<std::string> WalletManagerImpl::findWallets(const std::string &path)
 {
     std::vector<std::string> result;

src/wallet/api/wallet_manager.h

@@ -76,6 +76,7 @@ public:
     virtual bool closeWallet(Wallet *wallet, bool store = true) override;
     bool walletExists(const std::string &path) override;
     bool verifyWalletPassword(const std::string &keys_file_name, const std::string &password, bool no_spend_key, uint64_t kdf_rounds = 1) const override;
+    bool queryWalletDevice(Wallet::Device& device_type, const std::string &keys_file_name, const std::string &password, uint64_t kdf_rounds = 1) const;
     std::vector<std::string> findWallets(const std::string &path) override;
     std::string errorString() const override;
     void setDaemonAddress(const std::string &address) override;

src/wallet/wallet2.cpp

@@ -794,7 +794,7 @@ wallet2::wallet2(network_type nettype, uint64_t kdf_rounds, bool unattended):
   m_light_wallet_connected(false),
   m_light_wallet_balance(0),
   m_light_wallet_unlocked_balance(0),
-  m_key_on_device(false),
+  m_key_device_type(hw::device::device_type::SOFTWARE),
   m_ring_history_saved(false),
   m_ringdb(),
   m_last_block_reward(0),
@@ -2908,7 +2908,7 @@ bool wallet2::store_keys(const std::string& keys_file_name, const epee::wipeable
 
   rapidjson::Value value2(rapidjson::kNumberType);
 
-  value2.SetInt(m_key_on_device?1:0);
+  value2.SetInt(m_key_device_type);
   json.AddMember("key_on_device", value2, json.GetAllocator());
 
   value2.SetInt(watch_only ? 1 :0); // WTF ? JSON has different true and false types, and not boolean ??
@@ -3121,7 +3121,7 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
     m_subaddress_lookahead_major = SUBADDRESS_LOOKAHEAD_MAJOR;
     m_subaddress_lookahead_minor = SUBADDRESS_LOOKAHEAD_MINOR;
     m_device_name = "";
-    m_key_on_device = false;
+    m_key_device_type = hw::device::device_type::SOFTWARE;
     encrypted_secret_keys = false;
   }
   else if(json.IsObject())
@@ -3141,8 +3141,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
 
     if (json.HasMember("key_on_device"))
     {
-      GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, key_on_device, int, Int, false, false);
+      GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, key_on_device, int, Int, false, hw::device::device_type::SOFTWARE);
-      m_key_on_device = field_key_on_device;
+      m_key_device_type = static_cast<hw::device::device_type>(field_key_on_device);
     }
 
     GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, seed_language, std::string, String, false, std::string());
@@ -3269,7 +3269,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
   }
 
   r = epee::serialization::load_t_from_binary(m_account, account_data);
-  if (r && m_key_on_device) {
+  THROW_WALLET_EXCEPTION_IF(!r, error::invalid_password);
+  if (m_key_device_type == hw::device::device_type::LEDGER) {
     LOG_PRINT_L0("Account on device. Initing device...");
     hw::device &hwdev = hw::get_device(m_device_name);
     hwdev.set_name(m_device_name);
@@ -3277,6 +3278,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
     hwdev.connect();
     m_account.set_device(hwdev);
     LOG_PRINT_L0("Device inited...");
+  } else if (key_on_device()) {
+    THROW_WALLET_EXCEPTION(error::wallet_internal_error, "hardware device not supported");
   }
 
   if (r)
@@ -3444,6 +3447,59 @@ void wallet2::create_keys_file(const std::string &wallet_, bool watch_only, cons
 }
 
 
+/*!
+ * \brief determine the key storage for the specified wallet file
+ * \param device_type     (OUT) wallet backend as enumerated in hw::device::device_type
+ * \param keys_file_name  Keys file to verify password for
+ * \param password        Password to verify
+ * \return                true if password correct, else false
+ *
+ * for verification only - determines key storage hardware
+ *
+ */
+bool wallet2::query_device(hw::device::device_type& device_type, const std::string& keys_file_name, const epee::wipeable_string& password, uint64_t kdf_rounds)
+{
+  rapidjson::Document json;
+  wallet2::keys_file_data keys_file_data;
+  std::string buf;
+  bool r = epee::file_io_utils::load_file_to_string(keys_file_name, buf);
+  THROW_WALLET_EXCEPTION_IF(!r, error::file_read_error, keys_file_name);
+
+  // Decrypt the contents
+  r = ::serialization::parse_binary(buf, keys_file_data);
+  THROW_WALLET_EXCEPTION_IF(!r, error::wallet_internal_error, "internal error: failed to deserialize \"" + keys_file_name + '\"');
+  crypto::chacha_key key;
+  crypto::generate_chacha_key(password.data(), password.size(), key, kdf_rounds);
+  std::string account_data;
+  account_data.resize(keys_file_data.account_data.size());
+  crypto::chacha20(keys_file_data.account_data.data(), keys_file_data.account_data.size(), key, keys_file_data.iv, &account_data[0]);
+  if (json.Parse(account_data.c_str()).HasParseError() || !json.IsObject())
+    crypto::chacha8(keys_file_data.account_data.data(), keys_file_data.account_data.size(), key, keys_file_data.iv, &account_data[0]);
+
+  // The contents should be JSON if the wallet follows the new format.
+  if (json.Parse(account_data.c_str()).HasParseError())
+  {
+    // old format before JSON wallet key file format
+  }
+  else
+  {
+    account_data = std::string(json["key_data"].GetString(), json["key_data"].GetString() +
+      json["key_data"].GetStringLength());
+
+    if (json.HasMember("key_on_device"))
+    {
+      GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, key_on_device, int, Int, false, hw::device::device_type::SOFTWARE);
+      device_type = static_cast<hw::device::device_type>(field_key_on_device);
+    }
+  }
+
+  cryptonote::account_base account_data_check;
+
+  r = epee::serialization::load_t_from_binary(account_data_check, account_data);
+  if (!r) return false;
+  return true;
+}
+
 /*!
  * \brief  Generates a wallet or restores one.
  * \param  wallet_              Name of wallet file
@@ -3518,7 +3574,7 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   m_multisig = true;
   m_multisig_threshold = threshold;
   m_multisig_signers = multisig_signers;
-  m_key_on_device = false;
+  m_key_device_type = hw::device::device_type::SOFTWARE;
   setup_keys(password);
 
   create_keys_file(wallet_, false, password, m_nettype != MAINNET || create_address_file);
@@ -3558,7 +3614,7 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const epee::wip
   m_multisig = false;
   m_multisig_threshold = 0;
   m_multisig_signers.clear();
-  m_key_on_device = false;
+  m_key_device_type = hw::device::device_type::SOFTWARE;
   setup_keys(password);
 
   // calculate a starting refresh height
@@ -3646,7 +3702,7 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   m_multisig = false;
   m_multisig_threshold = 0;
   m_multisig_signers.clear();
-  m_key_on_device = false;
+  m_key_device_type = hw::device::device_type::SOFTWARE;
   setup_keys(password);
 
   create_keys_file(wallet_, true, password, m_nettype != MAINNET || create_address_file);
@@ -3686,7 +3742,7 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   m_multisig = false;
   m_multisig_threshold = 0;
   m_multisig_signers.clear();
-  m_key_on_device = false;
+  m_key_device_type = hw::device::device_type::SOFTWARE;
   setup_keys(password);
 
   create_keys_file(wallet_, false, password, create_address_file);
@@ -3713,12 +3769,12 @@ void wallet2::restore(const std::string& wallet_, const epee::wipeable_string& p
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_wallet_file, ignored_ec), error::file_exists, m_wallet_file);
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_keys_file,   ignored_ec), error::file_exists, m_keys_file);
   }
-  m_key_on_device = true;
 
   auto &hwdev = hw::get_device(device_name);
   hwdev.set_name(device_name);
 
   m_account.create_from_device(hwdev);
+  m_key_device_type = m_account.get_device().get_type();
   m_account_public_address = m_account.get_keys().m_account_address;
   m_watch_only = false;
   m_multisig = false;
@@ -3815,7 +3871,7 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
   m_watch_only = false;
   m_multisig = true;
   m_multisig_threshold = threshold;
-  m_key_on_device = false;
+  m_key_device_type = hw::device::device_type::SOFTWARE;
 
   if (threshold == spend_keys.size() + 1)
   {

src/wallet/wallet2.h

@@ -189,6 +189,7 @@ namespace tools
     static std::unique_ptr<wallet2> make_dummy(const boost::program_options::variables_map& vm, bool unattended, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter);
 
     static bool verify_password(const std::string& keys_file_name, const epee::wipeable_string& password, bool no_spend_key, hw::device &hwdev, uint64_t kdf_rounds);
+    static bool query_device(hw::device::device_type& device_type, const std::string& keys_file_name, const epee::wipeable_string& password, uint64_t kdf_rounds = 1);
 
     wallet2(cryptonote::network_type nettype = cryptonote::MAINNET, uint64_t kdf_rounds = 1, bool unattended = false);
     ~wallet2();
@@ -709,7 +710,8 @@ namespace tools
     bool has_multisig_partial_key_images() const;
     bool has_unknown_key_images() const;
     bool get_multisig_seed(epee::wipeable_string& seed, const epee::wipeable_string &passphrase = std::string(), bool raw = true) const;
-    bool key_on_device() const { return m_key_on_device; }
+    bool key_on_device() const { return get_device_type() != hw::device::device_type::SOFTWARE; }
+    hw::device::device_type get_device_type() const { return m_key_device_type; }
     bool reconnect_device();
 
     // locked & unlocked balance of given or current subaddress account
@@ -1284,7 +1286,7 @@ namespace tools
 
     bool m_trusted_daemon;
     i_wallet2_callback* m_callback;
-    bool m_key_on_device;
+    hw::device::device_type m_key_device_type;
     cryptonote::network_type m_nettype;
     uint64_t m_kdf_rounds;
     std::string seed_language; /*!< Language of the mnemonics (seed). */