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1809b8f038
b4f6e58ca5 Better error message for user when corrupt wallet unlock fails (MeshCollider) Pull request description: Mentioned here: https://github.com/bitcoin/bitcoin/issues/14461#issuecomment-429183503 Current behavior is to assert(false) and crash, only info is printed in the log. This shows the message to the user before abort() instead. Tree-SHA512: 526f9ed9262257fca55caf7153ab913ed958b13b079d2f01db797485614d8c375815a1554276e8cf73d3838104b2691a9cf85c8d097973127ae8de9e111446bf
559 lines
17 KiB
C++
559 lines
17 KiB
C++
// Copyright (c) 2009-2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <wallet/crypter.h>
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#include <crypto/aes.h>
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#include <crypto/sha512.h>
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#include <script/script.h>
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#include <script/standard.h>
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#include <util/system.h>
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#include <string>
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#include <vector>
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int CCrypter::BytesToKeySHA512AES(const std::vector<unsigned char>& chSalt, const SecureString& strKeyData, int count, unsigned char *key,unsigned char *iv) const
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{
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// This mimics the behavior of openssl's EVP_BytesToKey with an aes256cbc
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// cipher and sha512 message digest. Because sha512's output size (64b) is
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// greater than the aes256 block size (16b) + aes256 key size (32b),
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// there's no need to process more than once (D_0).
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if(!count || !key || !iv)
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return 0;
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unsigned char buf[CSHA512::OUTPUT_SIZE];
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CSHA512 di;
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di.Write((const unsigned char*)strKeyData.data(), strKeyData.size());
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di.Write(chSalt.data(), chSalt.size());
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di.Finalize(buf);
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for(int i = 0; i != count - 1; i++)
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di.Reset().Write(buf, sizeof(buf)).Finalize(buf);
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memcpy(key, buf, WALLET_CRYPTO_KEY_SIZE);
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memcpy(iv, buf + WALLET_CRYPTO_KEY_SIZE, WALLET_CRYPTO_IV_SIZE);
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memory_cleanse(buf, sizeof(buf));
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return WALLET_CRYPTO_KEY_SIZE;
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}
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bool CCrypter::SetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod)
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{
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if (nRounds < 1 || chSalt.size() != WALLET_CRYPTO_SALT_SIZE)
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return false;
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int i = 0;
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if (nDerivationMethod == 0)
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i = BytesToKeySHA512AES(chSalt, strKeyData, nRounds, vchKey.data(), vchIV.data());
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if (i != (int)WALLET_CRYPTO_KEY_SIZE)
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{
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memory_cleanse(vchKey.data(), vchKey.size());
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memory_cleanse(vchIV.data(), vchIV.size());
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return false;
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}
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fKeySet = true;
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return true;
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}
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bool CCrypter::SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV)
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{
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if (chNewKey.size() != WALLET_CRYPTO_KEY_SIZE || chNewIV.size() != WALLET_CRYPTO_IV_SIZE)
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return false;
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memcpy(vchKey.data(), chNewKey.data(), chNewKey.size());
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memcpy(vchIV.data(), chNewIV.data(), chNewIV.size());
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fKeySet = true;
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return true;
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}
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bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext) const
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{
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if (!fKeySet)
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return false;
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// max ciphertext len for a n bytes of plaintext is
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// n + AES_BLOCKSIZE bytes
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vchCiphertext.resize(vchPlaintext.size() + AES_BLOCKSIZE);
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AES256CBCEncrypt enc(vchKey.data(), vchIV.data(), true);
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size_t nLen = enc.Encrypt(&vchPlaintext[0], vchPlaintext.size(), vchCiphertext.data());
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if(nLen < vchPlaintext.size())
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return false;
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vchCiphertext.resize(nLen);
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return true;
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}
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bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext) const
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{
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if (!fKeySet)
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return false;
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// plaintext will always be equal to or lesser than length of ciphertext
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int nLen = vchCiphertext.size();
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vchPlaintext.resize(nLen);
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AES256CBCDecrypt dec(vchKey.data(), vchIV.data(), true);
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nLen = dec.Decrypt(vchCiphertext.data(), vchCiphertext.size(), &vchPlaintext[0]);
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if(nLen == 0)
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return false;
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vchPlaintext.resize(nLen);
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return true;
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}
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static bool EncryptSecret(const CKeyingMaterial& vMasterKey, const CKeyingMaterial &vchPlaintext, const uint256& nIV, std::vector<unsigned char> &vchCiphertext)
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{
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CCrypter cKeyCrypter;
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std::vector<unsigned char> chIV(WALLET_CRYPTO_IV_SIZE);
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memcpy(chIV.data(), &nIV, WALLET_CRYPTO_IV_SIZE);
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if(!cKeyCrypter.SetKey(vMasterKey, chIV))
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return false;
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return cKeyCrypter.Encrypt(*((const CKeyingMaterial*)&vchPlaintext), vchCiphertext);
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}
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// General secure AES 256 CBC encryption routine
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bool EncryptAES256(const SecureString& sKey, const SecureString& sPlaintext, const std::string& sIV, std::string& sCiphertext)
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{
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// Verify key sizes
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if(sKey.size() != 32 || sIV.size() != AES_BLOCKSIZE) {
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LogPrintf("crypter EncryptAES256 - Invalid key or block size: Key: %d sIV:%d\n", sKey.size(), sIV.size());
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return false;
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}
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// max ciphertext len for a n bytes of plaintext is
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// n + AES_BLOCKSIZE bytes
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sCiphertext.resize(sPlaintext.size() + AES_BLOCKSIZE);
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AES256CBCEncrypt enc((const unsigned char*) &sKey[0], (const unsigned char*) &sIV[0], true);
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size_t nLen = enc.Encrypt((const unsigned char*) &sPlaintext[0], sPlaintext.size(), (unsigned char*) &sCiphertext[0]);
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if(nLen < sPlaintext.size())
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return false;
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sCiphertext.resize(nLen);
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return true;
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}
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static bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCiphertext, const uint256& nIV, CKeyingMaterial& vchPlaintext)
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{
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CCrypter cKeyCrypter;
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std::vector<unsigned char> chIV(WALLET_CRYPTO_IV_SIZE);
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memcpy(chIV.data(), &nIV, WALLET_CRYPTO_IV_SIZE);
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if(!cKeyCrypter.SetKey(vMasterKey, chIV))
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return false;
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return cKeyCrypter.Decrypt(vchCiphertext, *((CKeyingMaterial*)&vchPlaintext));
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}
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// General secure AES 256 CBC decryption routine
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bool DecryptAES256(const SecureString& sKey, const std::string& sCiphertext, const std::string& sIV, SecureString& sPlaintext)
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{
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// Verify key sizes
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if(sKey.size() != 32 || sIV.size() != AES_BLOCKSIZE) {
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LogPrintf("crypter DecryptAES256 - Invalid key or block size\n");
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return false;
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}
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// plaintext will always be equal to or lesser than length of ciphertext
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int nLen = sCiphertext.size();
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sPlaintext.resize(nLen);
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AES256CBCDecrypt dec((const unsigned char*) &sKey[0], (const unsigned char*) &sIV[0], true);
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nLen = dec.Decrypt((const unsigned char*) &sCiphertext[0], sCiphertext.size(), (unsigned char*) &sPlaintext[0]);
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if(nLen == 0)
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return false;
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sPlaintext.resize(nLen);
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return true;
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}
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static bool DecryptKey(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCryptedSecret, const CPubKey& vchPubKey, CKey& key)
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{
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CKeyingMaterial vchSecret;
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if(!DecryptSecret(vMasterKey, vchCryptedSecret, vchPubKey.GetHash(), vchSecret))
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return false;
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if (vchSecret.size() != 32)
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return false;
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key.Set(vchSecret.begin(), vchSecret.end(), vchPubKey.IsCompressed());
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return key.VerifyPubKey(vchPubKey);
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}
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bool CCryptoKeyStore::SetCrypted()
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{
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LOCK(cs_KeyStore);
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if (fUseCrypto)
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return true;
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if (!mapKeys.empty())
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return false;
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fUseCrypto = true;
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return true;
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}
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// This function should be used in a different combinations to determine
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// if CCryptoKeyStore is fully locked so that no operations requiring access
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// to private keys are possible:
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// IsLocked(true)
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// or if CCryptoKeyStore's private keys are available for mixing only:
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// !IsLocked(true) && IsLocked()
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// or if they are available for everything:
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// !IsLocked()
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bool CCryptoKeyStore::IsLocked(bool fForMixing) const
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{
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if (!IsCrypted())
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return false;
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bool result;
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{
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LOCK(cs_KeyStore);
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result = vMasterKey.empty();
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}
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// fForMixing fOnlyMixingAllowed return
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// ---------------------------------------
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// true true result
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// true false result
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// false true true
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// false false result
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if(!fForMixing && fOnlyMixingAllowed) return true;
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return result;
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}
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bool CCryptoKeyStore::Lock(bool fAllowMixing)
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{
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if (!SetCrypted())
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return false;
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if(!fAllowMixing) {
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LOCK(cs_KeyStore);
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vMasterKey.clear();
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}
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fOnlyMixingAllowed = fAllowMixing;
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NotifyStatusChanged(this);
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return true;
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}
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bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn, bool fForMixingOnly)
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{
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{
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LOCK(cs_KeyStore);
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if (!SetCrypted())
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return false;
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bool keyPass = false;
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bool keyFail = false;
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CryptedKeyMap::const_iterator mi = mapCryptedKeys.begin();
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for (; mi != mapCryptedKeys.end(); ++mi)
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{
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const CPubKey &vchPubKey = (*mi).second.first;
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const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
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CKey key;
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if (!DecryptKey(vMasterKeyIn, vchCryptedSecret, vchPubKey, key))
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{
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keyFail = true;
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break;
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}
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keyPass = true;
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if (fDecryptionThoroughlyChecked)
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break;
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}
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if (keyPass && keyFail)
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{
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LogPrintf("The wallet is probably corrupted: Some keys decrypt but not all.\n");
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throw std::runtime_error("Error unlocking wallet: some keys decrypt but not all. Your wallet file may be corrupt.");
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}
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if (keyFail || (!keyPass && cryptedHDChain.IsNull()))
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return false;
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vMasterKey = vMasterKeyIn;
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if(!cryptedHDChain.IsNull()) {
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bool chainPass = false;
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// try to decrypt seed and make sure it matches
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CHDChain hdChainTmp;
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if (DecryptHDChain(hdChainTmp)) {
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// make sure seed matches this chain
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chainPass = cryptedHDChain.GetID() == hdChainTmp.GetSeedHash();
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}
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if (!chainPass) {
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vMasterKey.clear();
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return false;
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}
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}
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fDecryptionThoroughlyChecked = true;
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}
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fOnlyMixingAllowed = fForMixingOnly;
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NotifyStatusChanged(this);
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return true;
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}
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bool CCryptoKeyStore::AddKeyPubKey(const CKey& key, const CPubKey &pubkey)
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted()) {
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return CBasicKeyStore::AddKeyPubKey(key, pubkey);
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}
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if (IsLocked(true)) {
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return false;
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}
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std::vector<unsigned char> vchCryptedSecret;
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CKeyingMaterial vchSecret(key.begin(), key.end());
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if (!EncryptSecret(vMasterKey, vchSecret, pubkey.GetHash(), vchCryptedSecret)) {
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return false;
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}
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if (!AddCryptedKey(pubkey, vchCryptedSecret)) {
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return false;
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}
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return true;
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}
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bool CCryptoKeyStore::AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
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{
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LOCK(cs_KeyStore);
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if (!SetCrypted()) {
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return false;
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}
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mapCryptedKeys[vchPubKey.GetID()] = make_pair(vchPubKey, vchCryptedSecret);
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return true;
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}
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bool CCryptoKeyStore::HaveKey(const CKeyID &address) const
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted()) {
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return CBasicKeyStore::HaveKey(address);
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}
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return mapCryptedKeys.count(address) > 0;
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}
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bool CCryptoKeyStore::GetKey(const CKeyID &address, CKey& keyOut) const
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted()) {
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return CBasicKeyStore::GetKey(address, keyOut);
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}
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CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
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if (mi != mapCryptedKeys.end())
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{
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const CPubKey &vchPubKey = (*mi).second.first;
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const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
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return DecryptKey(vMasterKey, vchCryptedSecret, vchPubKey, keyOut);
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}
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return false;
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}
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bool CCryptoKeyStore::GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted())
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return CBasicKeyStore::GetPubKey(address, vchPubKeyOut);
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CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
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if (mi != mapCryptedKeys.end())
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{
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vchPubKeyOut = (*mi).second.first;
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return true;
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}
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// Check for watch-only pubkeys
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return CBasicKeyStore::GetPubKey(address, vchPubKeyOut);
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}
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std::set<CKeyID> CCryptoKeyStore::GetKeys() const
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted()) {
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return CBasicKeyStore::GetKeys();
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}
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std::set<CKeyID> set_address;
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for (const auto& mi : mapCryptedKeys) {
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set_address.insert(mi.first);
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}
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return set_address;
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}
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bool CCryptoKeyStore::EncryptKeys(CKeyingMaterial& vMasterKeyIn)
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{
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LOCK(cs_KeyStore);
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if (!mapCryptedKeys.empty() || IsCrypted())
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return false;
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fUseCrypto = true;
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for (const KeyMap::value_type& mKey : mapKeys)
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{
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const CKey &key = mKey.second;
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CPubKey vchPubKey = key.GetPubKey();
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CKeyingMaterial vchSecret(key.begin(), key.end());
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std::vector<unsigned char> vchCryptedSecret;
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if (!EncryptSecret(vMasterKeyIn, vchSecret, vchPubKey.GetHash(), vchCryptedSecret))
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return false;
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if (!AddCryptedKey(vchPubKey, vchCryptedSecret))
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return false;
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}
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mapKeys.clear();
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return true;
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}
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bool CCryptoKeyStore::EncryptHDChain(const CKeyingMaterial& vMasterKeyIn, const CHDChain& chain)
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{
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LOCK(cs_KeyStore);
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// should call EncryptKeys first
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if (!IsCrypted())
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return false;
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if (!cryptedHDChain.IsNull())
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return true;
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if (cryptedHDChain.IsCrypted())
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return true;
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if (hdChain.IsNull() && !chain.IsNull()) {
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// Encrypting a new HDChain for an already encrypted non-HD wallet
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hdChain = chain;
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}
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// make sure seed matches this chain
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if (hdChain.GetID() != hdChain.GetSeedHash())
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return false;
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std::vector<unsigned char> vchCryptedSeed;
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if (!EncryptSecret(vMasterKeyIn, hdChain.GetSeed(), hdChain.GetID(), vchCryptedSeed))
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return false;
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hdChain.Debug(__func__);
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cryptedHDChain = hdChain;
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cryptedHDChain.SetCrypted(true);
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SecureVector vchSecureCryptedSeed(vchCryptedSeed.begin(), vchCryptedSeed.end());
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if (!cryptedHDChain.SetSeed(vchSecureCryptedSeed, false))
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return false;
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SecureVector vchMnemonic;
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SecureVector vchMnemonicPassphrase;
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// it's ok to have no mnemonic if wallet was initialized via hdseed
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if (hdChain.GetMnemonic(vchMnemonic, vchMnemonicPassphrase)) {
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std::vector<unsigned char> vchCryptedMnemonic;
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std::vector<unsigned char> vchCryptedMnemonicPassphrase;
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if (!vchMnemonic.empty() && !EncryptSecret(vMasterKeyIn, vchMnemonic, hdChain.GetID(), vchCryptedMnemonic))
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return false;
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if (!vchMnemonicPassphrase.empty() && !EncryptSecret(vMasterKeyIn, vchMnemonicPassphrase, hdChain.GetID(), vchCryptedMnemonicPassphrase))
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return false;
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SecureVector vchSecureCryptedMnemonic(vchCryptedMnemonic.begin(), vchCryptedMnemonic.end());
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SecureVector vchSecureCryptedMnemonicPassphrase(vchCryptedMnemonicPassphrase.begin(), vchCryptedMnemonicPassphrase.end());
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if (!cryptedHDChain.SetMnemonic(vchSecureCryptedMnemonic, vchSecureCryptedMnemonicPassphrase, false))
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return false;
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}
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if (!hdChain.SetNull())
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return false;
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return true;
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}
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bool CCryptoKeyStore::DecryptHDChain(CHDChain& hdChainRet) const
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted())
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return true;
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if (cryptedHDChain.IsNull())
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return false;
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if (!cryptedHDChain.IsCrypted())
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return false;
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SecureVector vchSecureSeed;
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SecureVector vchSecureCryptedSeed = cryptedHDChain.GetSeed();
|
|
std::vector<unsigned char> vchCryptedSeed(vchSecureCryptedSeed.begin(), vchSecureCryptedSeed.end());
|
|
if (!DecryptSecret(vMasterKey, vchCryptedSeed, cryptedHDChain.GetID(), vchSecureSeed))
|
|
return false;
|
|
|
|
hdChainRet = cryptedHDChain;
|
|
if (!hdChainRet.SetSeed(vchSecureSeed, false))
|
|
return false;
|
|
|
|
// hash of decrypted seed must match chain id
|
|
if (hdChainRet.GetSeedHash() != cryptedHDChain.GetID())
|
|
return false;
|
|
|
|
SecureVector vchSecureCryptedMnemonic;
|
|
SecureVector vchSecureCryptedMnemonicPassphrase;
|
|
|
|
// it's ok to have no mnemonic if wallet was initialized via hdseed
|
|
if (cryptedHDChain.GetMnemonic(vchSecureCryptedMnemonic, vchSecureCryptedMnemonicPassphrase)) {
|
|
SecureVector vchSecureMnemonic;
|
|
SecureVector vchSecureMnemonicPassphrase;
|
|
|
|
std::vector<unsigned char> vchCryptedMnemonic(vchSecureCryptedMnemonic.begin(), vchSecureCryptedMnemonic.end());
|
|
std::vector<unsigned char> vchCryptedMnemonicPassphrase(vchSecureCryptedMnemonicPassphrase.begin(), vchSecureCryptedMnemonicPassphrase.end());
|
|
|
|
if (!vchCryptedMnemonic.empty() && !DecryptSecret(vMasterKey, vchCryptedMnemonic, cryptedHDChain.GetID(), vchSecureMnemonic))
|
|
return false;
|
|
if (!vchCryptedMnemonicPassphrase.empty() && !DecryptSecret(vMasterKey, vchCryptedMnemonicPassphrase, cryptedHDChain.GetID(), vchSecureMnemonicPassphrase))
|
|
return false;
|
|
|
|
if (!hdChainRet.SetMnemonic(vchSecureMnemonic, vchSecureMnemonicPassphrase, false))
|
|
return false;
|
|
}
|
|
|
|
hdChainRet.SetCrypted(false);
|
|
hdChainRet.Debug(__func__);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool CCryptoKeyStore::SetHDChain(const CHDChain& chain)
|
|
{
|
|
LOCK(cs_KeyStore);
|
|
if (IsCrypted())
|
|
return false;
|
|
|
|
if (chain.IsCrypted())
|
|
return false;
|
|
|
|
hdChain = chain;
|
|
return true;
|
|
}
|
|
|
|
bool CCryptoKeyStore::SetCryptedHDChain(const CHDChain& chain)
|
|
{
|
|
LOCK(cs_KeyStore);
|
|
if (!SetCrypted())
|
|
return false;
|
|
|
|
if (!chain.IsCrypted())
|
|
return false;
|
|
|
|
cryptedHDChain = chain;
|
|
return true;
|
|
}
|
|
|
|
bool CCryptoKeyStore::GetHDChain(CHDChain& hdChainRet) const
|
|
{
|
|
LOCK(cs_KeyStore);
|
|
if(IsCrypted()) {
|
|
hdChainRet = cryptedHDChain;
|
|
return !cryptedHDChain.IsNull();
|
|
}
|
|
|
|
hdChainRet = hdChain;
|
|
return !hdChain.IsNull();
|
|
}
|