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wallet: wipe seed from memory where appropriate

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This commit is contained in:
moneromooo-monero
2018-07-07 00:03:15 +01:00
parent b780cf4db1
commit ea37614efe
19 changed files with 653 additions and 144 deletions
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src/wallet/wallet2.cpp
+31 -13
View File
@@ -789,7 +789,7 @@ bool wallet2::is_deterministic() const
return keys_deterministic;
}
//----------------------------------------------------------------------------------------------------
bool wallet2::get_seed(std::string& electrum_words, const epee::wipeable_string &passphrase) const
bool wallet2::get_seed(epee::wipeable_string& electrum_words, const epee::wipeable_string &passphrase) const
{
bool keys_deterministic = is_deterministic();
if (!keys_deterministic)
@@ -815,7 +815,7 @@ bool wallet2::get_seed(std::string& electrum_words, const epee::wipeable_string
return true;
}
//----------------------------------------------------------------------------------------------------
bool wallet2::get_multisig_seed(std::string& seed, const epee::wipeable_string &passphrase, bool raw) const
bool wallet2::get_multisig_seed(epee::wipeable_string& seed, const epee::wipeable_string &passphrase, bool raw) const
{
bool ready;
uint32_t threshold, total;
@@ -838,7 +838,7 @@ bool wallet2::get_multisig_seed(std::string& seed, const epee::wipeable_string &
crypto::secret_key skey;
crypto::public_key pkey;
const account_keys &keys = get_account().get_keys();
std::string data;
epee::wipeable_string data;
data.append((const char*)&threshold, sizeof(uint32_t));
data.append((const char*)&total, sizeof(uint32_t));
skey = keys.m_spend_secret_key;
@@ -864,7 +864,7 @@ bool wallet2::get_multisig_seed(std::string& seed, const epee::wipeable_string &
if (raw)
{
seed = epee::string_tools::buff_to_hex_nodelimer(data);
seed = epee::to_hex::wipeable_string({(const unsigned char*)data.data(), data.size()});
}
else
{
@@ -3161,7 +3161,7 @@ bool wallet2::verify_password(const std::string& keys_file_name, const epee::wip
* \param create_address_file Whether to create an address file
*/
void wallet2::generate(const std::string& wallet_, const epee::wipeable_string& password,
const std::string& multisig_data, bool create_address_file)
const epee::wipeable_string& multisig_data, bool create_address_file)
{
clear();
prepare_file_names(wallet_);
@@ -10671,14 +10671,14 @@ size_t wallet2::import_multisig(std::vector<cryptonote::blobdata> blobs)
return n_outputs;
}
//----------------------------------------------------------------------------------------------------
std::string wallet2::encrypt(const std::string &plaintext, const crypto::secret_key &skey, bool authenticated) const
std::string wallet2::encrypt(const char *plaintext, size_t len, const crypto::secret_key &skey, bool authenticated) const
{
crypto::chacha_key key;
crypto::generate_chacha_key(&skey, sizeof(skey), key, m_kdf_rounds);
std::string ciphertext;
crypto::chacha_iv iv = crypto::rand<crypto::chacha_iv>();
ciphertext.resize(plaintext.size() + sizeof(iv) + (authenticated ? sizeof(crypto::signature) : 0));
crypto::chacha20(plaintext.data(), plaintext.size(), key, iv, &ciphertext[sizeof(iv)]);
ciphertext.resize(len + sizeof(iv) + (authenticated ? sizeof(crypto::signature) : 0));
crypto::chacha20(plaintext, len, key, iv, &ciphertext[sizeof(iv)]);
memcpy(&ciphertext[0], &iv, sizeof(iv));
if (authenticated)
{
@@ -10692,12 +10692,28 @@ std::string wallet2::encrypt(const std::string &plaintext, const crypto::secret_
return ciphertext;
}
//----------------------------------------------------------------------------------------------------
std::string wallet2::encrypt(const epee::span<char> &plaintext, const crypto::secret_key &skey, bool authenticated) const
{
return encrypt(plaintext.data(), plaintext.size(), skey, authenticated);
}
//----------------------------------------------------------------------------------------------------
std::string wallet2::encrypt(const std::string &plaintext, const crypto::secret_key &skey, bool authenticated) const
{
return encrypt(plaintext.data(), plaintext.size(), skey, authenticated);
}
//----------------------------------------------------------------------------------------------------
std::string wallet2::encrypt(const epee::wipeable_string &plaintext, const crypto::secret_key &skey, bool authenticated) const
{
return encrypt(plaintext.data(), plaintext.size(), skey, authenticated);
}
//----------------------------------------------------------------------------------------------------
std::string wallet2::encrypt_with_view_secret_key(const std::string &plaintext, bool authenticated) const
{
return encrypt(plaintext, get_account().get_keys().m_view_secret_key, authenticated);
}
//----------------------------------------------------------------------------------------------------
std::string wallet2::decrypt(const std::string &ciphertext, const crypto::secret_key &skey, bool authenticated) const
template<typename T>
T wallet2::decrypt(const std::string &ciphertext, const crypto::secret_key &skey, bool authenticated) const
{
const size_t prefix_size = sizeof(chacha_iv) + (authenticated ? sizeof(crypto::signature) : 0);
THROW_WALLET_EXCEPTION_IF(ciphertext.size() < prefix_size,
@@ -10706,8 +10722,6 @@ std::string wallet2::decrypt(const std::string &ciphertext, const crypto::secret
crypto::chacha_key key;
crypto::generate_chacha_key(&skey, sizeof(skey), key, m_kdf_rounds);
const crypto::chacha_iv &iv = *(const crypto::chacha_iv*)&ciphertext[0];
std::string plaintext;
plaintext.resize(ciphertext.size() - prefix_size);
if (authenticated)
{
crypto::hash hash;
@@ -10718,10 +10732,14 @@ std::string wallet2::decrypt(const std::string &ciphertext, const crypto::secret
THROW_WALLET_EXCEPTION_IF(!crypto::check_signature(hash, pkey, signature),
error::wallet_internal_error, "Failed to authenticate ciphertext");
}
crypto::chacha20(ciphertext.data() + sizeof(iv), ciphertext.size() - prefix_size, key, iv, &plaintext[0]);
return plaintext;
std::unique_ptr<char[]> buffer{new char[ciphertext.size() - prefix_size]};
auto wiper = epee::misc_utils::create_scope_leave_handler([&]() { memwipe(buffer.get(), ciphertext.size() - prefix_size); });
crypto::chacha20(ciphertext.data() + sizeof(iv), ciphertext.size() - prefix_size, key, iv, buffer.get());
return T(buffer.get(), ciphertext.size() - prefix_size);
}
//----------------------------------------------------------------------------------------------------
template epee::wipeable_string wallet2::decrypt(const std::string &ciphertext, const crypto::secret_key &skey, bool authenticated) const;
//----------------------------------------------------------------------------------------------------
std::string wallet2::decrypt_with_view_secret_key(const std::string &ciphertext, bool authenticated) const
{
return decrypt(ciphertext, get_account().get_keys().m_view_secret_key, authenticated);