cpp-ethereum/libdevcrypto/SecretStore.cpp at develop · cheny56/cpp-ethereum · GitHub

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This file is part of cpp-ethereum.

cpp-ethereum is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

cpp-ethereum is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.

/** @file SecretStore.cpp

* @author Gav Wood <i@gavwood.com>

* @date 2014

#include "SecretStore.h"

#include <thread>

#include <mutex>

#include <boost/algorithm/string.hpp>

#include <boost/filesystem.hpp>

#include <libdevcore/Log.h>

#include <libdevcore/Guards.h>

#include <libdevcore/SHA3.h>

#include <libdevcore/FileSystem.h>

#include <json_spirit/JsonSpiritHeaders.h>

#include <libdevcrypto/Exceptions.h>

using namespace std;

using namespace dev;

namespace js = json_spirit;

namespace fs = boost::filesystem;

static const int c_keyFileVersion = 3;

/// Upgrade the json-format to the current version.

static js::mValue upgraded(string const& _s)

{

js::mValue v;

js::read_string(_s, v);

if (v.type() != js::obj_type)

return js::mValue();

js::mObject ret = v.get_obj();

unsigned version = ret.count("Version") ? stoi(ret["Version"].get_str()) : ret.count("version") ? ret["version"].get_int() : 0;

if (version == 1)

{

// upgrade to version 2

js::mObject old;

swap(old, ret);

ret["id"] = old["Id"];

js::mObject c;

c["ciphertext"] = old["Crypto"].get_obj()["CipherText"];

c["cipher"] = "aes-128-cbc";

{

js::mObject cp;

cp["iv"] = old["Crypto"].get_obj()["IV"];

c["cipherparams"] = cp;

}

c["kdf"] = old["Crypto"].get_obj()["KeyHeader"].get_obj()["Kdf"];

{

js::mObject kp;

kp["salt"] = old["Crypto"].get_obj()["Salt"];

for (auto const& i: old["Crypto"].get_obj()["KeyHeader"].get_obj()["KdfParams"].get_obj())

if (i.first != "SaltLen")

kp[boost::to_lower_copy(i.first)] = i.second;

c["kdfparams"] = kp;

}

c["sillymac"] = old["Crypto"].get_obj()["MAC"];

c["sillymacjson"] = _s;

ret["crypto"] = c;

version = 2;

}

if (ret.count("Crypto") && !ret.count("crypto"))

{

ret["crypto"] = ret["Crypto"];

ret.erase("Crypto");

}

if (version == 2)

{

ret["crypto"].get_obj()["cipher"] = "aes-128-ctr";

ret["crypto"].get_obj()["compat"] = "2";

version = 3;

}

if (version == c_keyFileVersion)

return ret;

return js::mValue();

}

SecretStore::SecretStore(fs::path const& _path): m_path(_path)

{

load();

}

void SecretStore::setPath(fs::path const& _path)

{

m_path = _path;

load();

}

bytesSec SecretStore::secret(h128 const& _uuid, function<string()> const& _pass, bool _useCache) const

{

auto rit = m_cached.find(_uuid);

if (_useCache && rit != m_cached.end())

return rit->second;

auto it = m_keys.find(_uuid);

bytesSec key;

if (it != m_keys.end())

{

key = bytesSec(decrypt(it->second.encryptedKey, _pass()));

if (!key.empty())

{

m_cached[_uuid] = key;

// TODO: Fix constness.

const_cast<SecretStore*>(this)->noteAddress(_uuid, toAddress(Secret{key}));

}

return key;

}

bytesSec SecretStore::secret(Address const& _address, function<string()> const& _pass) const

{

bytesSec ret;

if (auto k = key(_address))

ret = bytesSec(decrypt(k->second.encryptedKey, _pass()));

return ret;

}

bytesSec SecretStore::secret(string const& _content, string const& _pass)

{

try

{

js::mValue u = upgraded(_content);

if (u.type() != js::obj_type)

return bytesSec();

return decrypt(js::write_string(u.get_obj()["crypto"], false), _pass);

}

catch (...)

{

return bytesSec();

}

h128 SecretStore::importSecret(bytesSec const& _s, string const& _pass)

{

h128 r = h128::random();

EncryptedKey key{encrypt(_s.ref(), _pass), toUUID(r), KeyPair(Secret(_s)).address()};

m_cached[r] = _s;

m_keys[r] = move(key);

save();

return r;

}

h128 SecretStore::importSecret(bytesConstRef _s, string const& _pass)

{

h128 r = h128::random();

EncryptedKey key{encrypt(_s, _pass), toUUID(r), KeyPair(Secret(_s)).address()};

m_cached[r] = bytesSec(_s);

m_keys[r] = move(key);

save();

return r;

}

void SecretStore::kill(h128 const& _uuid)

{

m_cached.erase(_uuid);

if (m_keys.count(_uuid))

{

fs::remove(m_keys[_uuid].filename);

m_keys.erase(_uuid);

}

void SecretStore::clearCache() const

{

m_cached.clear();

}

void SecretStore::save(fs::path const& _keysPath)

{

fs::create_directories(_keysPath);

DEV_IGNORE_EXCEPTIONS(fs::permissions(_keysPath, fs::owner_all));

for (auto& k: m_keys)

{

string uuid = toUUID(k.first);

fs::path filename = (_keysPath / uuid).string() + ".json";

js::mObject v;

js::mValue crypto;

js::read_string(k.second.encryptedKey, crypto);

v["address"] = k.second.address.hex();

v["crypto"] = crypto;

v["id"] = uuid;

v["version"] = c_keyFileVersion;

writeFile(filename, js::write_string(js::mValue(v), true));

swap(k.second.filename, filename);

if (!filename.empty() && !fs::equivalent(filename, k.second.filename))

fs::remove(filename);

}

bool SecretStore::noteAddress(h128 const& _uuid, Address const& _address)

{

auto it = m_keys.find(_uuid);

if (it != m_keys.end() && it->second.address == ZeroAddress)

{

it->second.address = _address;

return true;

}

return false;

}

void SecretStore::load(fs::path const& _keysPath)

{

try

{

for (fs::directory_iterator it(_keysPath); it != fs::directory_iterator(); ++it)

if (fs::is_regular_file(it->path()))

readKey(it->path().string(), true);

}

catch (...) {}

}

h128 SecretStore::readKey(fs::path const& _file, bool _takeFileOwnership)

{

ctrace << "Reading" << _file.string();

return readKeyContent(contentsString(_file), _takeFileOwnership ? _file : string());

}

h128 SecretStore::readKeyContent(string const& _content, fs::path const& _file)

{

try

{

js::mValue u = upgraded(_content);

if (u.type() == js::obj_type)

{

js::mObject& o = u.get_obj();

auto uuid = fromUUID(o["id"].get_str());

Address address = ZeroAddress;

if (o.find("address") != o.end() && isHex(o["address"].get_str()))

address = Address(o["address"].get_str());

else

cwarn << "Account address is either not defined or not in hex format" << _file.string();

m_keys[uuid] = EncryptedKey{js::write_string(o["crypto"], false), _file, address};

return uuid;

}

else

cwarn << "Invalid JSON in key file" << _file.string();

return h128();

}

catch (...)

{

return h128();

}

bool SecretStore::recode(Address const& _address, string const& _newPass, function<string()> const& _pass, KDF _kdf)

{

if (auto k = key(_address))

{

bytesSec s = secret(_address, _pass);

if (s.empty())

return false;

else

{

k->second.encryptedKey = encrypt(s.ref(), _newPass, _kdf);

save();

return true;

}

return false;

}

pair<h128 const, SecretStore::EncryptedKey> const* SecretStore::key(Address const& _address) const

{

for (auto const& k: m_keys)

if (k.second.address == _address)

return &k;

return nullptr;

}

pair<h128 const, SecretStore::EncryptedKey>* SecretStore::key(Address const& _address)

{

for (auto& k: m_keys)

if (k.second.address == _address)

return &k;

return nullptr;

}

bool SecretStore::recode(h128 const& _uuid, string const& _newPass, function<string()> const& _pass, KDF _kdf)

{

bytesSec s = secret(_uuid, _pass, true);

if (s.empty())

return false;

m_cached.erase(_uuid);

m_keys[_uuid].encryptedKey = encrypt(s.ref(), _newPass, _kdf);

save();

return true;

}

static bytesSec deriveNewKey(string const& _pass, KDF _kdf, js::mObject& o_ret)

{

unsigned dklen = 32;

unsigned iterations = 1 << 18;

bytes salt = h256::random().asBytes();

if (_kdf == KDF::Scrypt)

{

unsigned p = 1;

unsigned r = 8;

o_ret["kdf"] = "scrypt";

{

js::mObject params;

params["n"] = int64_t(iterations);

params["r"] = int(r);

params["p"] = int(p);

params["dklen"] = int(dklen);

params["salt"] = toHex(salt);

o_ret["kdfparams"] = params;

}

return scrypt(_pass, salt, iterations, r, p, dklen);

}

else

{

o_ret["kdf"] = "pbkdf2";

{

js::mObject params;

params["prf"] = "hmac-sha256";

params["c"] = int(iterations);

params["salt"] = toHex(salt);

params["dklen"] = int(dklen);

o_ret["kdfparams"] = params;

}

return pbkdf2(_pass, salt, iterations, dklen);

}

string SecretStore::encrypt(bytesConstRef _v, string const& _pass, KDF _kdf)

{

js::mObject ret;

bytesSec derivedKey = deriveNewKey(_pass, _kdf, ret);

if (derivedKey.empty())

BOOST_THROW_EXCEPTION(crypto::CryptoException() << errinfo_comment("Key derivation failed."));

ret["cipher"] = "aes-128-ctr";

SecureFixedHash<16> key(derivedKey, h128::AlignLeft);

h128 iv = h128::random();

{

js::mObject params;

params["iv"] = toHex(iv.ref());

ret["cipherparams"] = params;

}

// cipher text

bytes cipherText = encryptSymNoAuth(key, iv, _v);

if (cipherText.empty())

BOOST_THROW_EXCEPTION(crypto::CryptoException() << errinfo_comment("Key encryption failed."));

ret["ciphertext"] = toHex(cipherText);

// and mac.

h256 mac = sha3(derivedKey.ref().cropped(16, 16).toBytes() + cipherText);

ret["mac"] = toHex(mac.ref());

return js::write_string(js::mValue(ret), true);

}

bytesSec SecretStore::decrypt(string const& _v, string const& _pass)

{

js::mObject o;

{

js::mValue ov;

js::read_string(_v, ov);

o = ov.get_obj();

}

// derive key

bytesSec derivedKey;

if (o["kdf"].get_str() == "pbkdf2")

{

auto params = o["kdfparams"].get_obj();

if (params["prf"].get_str() != "hmac-sha256")

{

cwarn << "Unknown PRF for PBKDF2" << params["prf"].get_str() << "not supported.";

return bytesSec();

}

unsigned iterations = params["c"].get_int();

bytes salt = fromHex(params["salt"].get_str());

derivedKey = pbkdf2(_pass, salt, iterations, params["dklen"].get_int());

}

else if (o["kdf"].get_str() == "scrypt")

{

auto p = o["kdfparams"].get_obj();

derivedKey = scrypt(_pass, fromHex(p["salt"].get_str()), p["n"].get_int(), p["r"].get_int(), p["p"].get_int(), p["dklen"].get_int());

}

else

{

cwarn << "Unknown KDF" << o["kdf"].get_str() << "not supported.";

return bytesSec();

}

if (derivedKey.size() < 32 && !(o.count("compat") && o["compat"].get_str() == "2"))

{

cwarn << "Derived key's length too short (<32 bytes)";

return bytesSec();

}

bytes cipherText = fromHex(o["ciphertext"].get_str());

// check MAC

if (o.count("mac"))

{

h256 mac(o["mac"].get_str());

h256 macExp;

if (o.count("compat") && o["compat"].get_str() == "2")

macExp = sha3(derivedKey.ref().cropped(derivedKey.size() - 16).toBytes() + cipherText);

else

macExp = sha3(derivedKey.ref().cropped(16, 16).toBytes() + cipherText);

if (mac != macExp)

{

cwarn << "Invalid key - MAC mismatch; expected" << toString(macExp) << ", got" << toString(mac);

return bytesSec();

}

else if (o.count("sillymac"))

{

h256 mac(o["sillymac"].get_str());

h256 macExp = sha3(asBytes(o["sillymacjson"].get_str()) + derivedKey.ref().cropped(derivedKey.size() - 16).toBytes() + cipherText);

if (mac != macExp)

{

cwarn << "Invalid key - MAC mismatch; expected" << toString(macExp) << ", got" << toString(mac);

return bytesSec();

}

else

cwarn << "No MAC. Proceeding anyway.";

// decrypt

if (o["cipher"].get_str() == "aes-128-ctr")

{

auto params = o["cipherparams"].get_obj();

h128 iv(params["iv"].get_str());

if (o.count("compat") && o["compat"].get_str() == "2")

{

SecureFixedHash<16> key(sha3Secure(derivedKey.ref().cropped(derivedKey.size() - 16)), h128::AlignRight);

return decryptSymNoAuth(key, iv, &cipherText);

}

else

return decryptSymNoAuth(SecureFixedHash<16>(derivedKey, h128::AlignLeft), iv, &cipherText);

}

else

{

cwarn << "Unknown cipher" << o["cipher"].get_str() << "not supported.";

return bytesSec();

}

cpp-ethereum/libdevcrypto/SecretStore.cpp at develop · cheny56/cpp-ethereum · GitHub

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