monero/src/wallet/ringdb.cpp

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// Copyright (c) 2018, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <lmdb.h>
#include <boost/algorithm/string.hpp>
#include <boost/range/adaptor/transformed.hpp>
#include <boost/filesystem.hpp>
#include "misc_log_ex.h"
#include "misc_language.h"
#include "wallet_errors.h"
#include "ringdb.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "wallet.ringdb"
static const char zerokey[8] = {0};
static const MDB_val zerokeyval = { sizeof(zerokey), (void *)zerokey };
static int compare_hash32(const MDB_val *a, const MDB_val *b)
{
uint32_t *va = (uint32_t*) a->mv_data;
uint32_t *vb = (uint32_t*) b->mv_data;
for (int n = 7; n >= 0; n--)
{
if (va[n] == vb[n])
continue;
return va[n] < vb[n] ? -1 : 1;
}
return 0;
}
static int compare_uint64(const MDB_val *a, const MDB_val *b)
{
const uint64_t va = *(const uint64_t*) a->mv_data;
const uint64_t vb = *(const uint64_t*) b->mv_data;
return va < vb ? -1 : va > vb;
}
static std::string compress_ring(const std::vector<uint64_t> &ring)
{
std::string s;
for (uint64_t out: ring)
s += tools::get_varint_data(out);
return s;
}
static std::vector<uint64_t> decompress_ring(const std::string &s)
{
std::vector<uint64_t> ring;
int read = 0;
for (std::string::const_iterator i = s.begin(); i != s.cend(); std::advance(i, read))
{
uint64_t out;
std::string tmp(i, s.cend());
read = tools::read_varint(tmp.begin(), tmp.end(), out);
THROW_WALLET_EXCEPTION_IF(read <= 0 || read > 256, tools::error::wallet_internal_error, "Internal error decompressing ring");
ring.push_back(out);
}
return ring;
}
std::string get_rings_filename(boost::filesystem::path filename)
{
if (!boost::filesystem::is_directory(filename))
filename.remove_filename();
return filename.string();
}
static crypto::chacha_iv make_iv(const crypto::key_image &key_image, const crypto::chacha_key &key)
{
static const char salt[] = "ringdsb";
uint8_t buffer[sizeof(key_image) + sizeof(key) + sizeof(salt)];
memcpy(buffer, &key_image, sizeof(key_image));
memcpy(buffer + sizeof(key_image), &key, sizeof(key));
memcpy(buffer + sizeof(key_image) + sizeof(key), salt, sizeof(salt));
crypto::hash hash;
crypto::cn_fast_hash(buffer, sizeof(buffer), hash.data);
static_assert(sizeof(hash) >= CHACHA_IV_SIZE, "Incompatible hash and chacha IV sizes");
crypto::chacha_iv iv;
memcpy(&iv, &hash, CHACHA_IV_SIZE);
return iv;
}
static std::string encrypt(const std::string &plaintext, const crypto::key_image &key_image, const crypto::chacha_key &key)
{
const crypto::chacha_iv iv = make_iv(key_image, key);
std::string ciphertext;
ciphertext.resize(plaintext.size() + sizeof(iv));
crypto::chacha20(plaintext.data(), plaintext.size(), key, iv, &ciphertext[sizeof(iv)]);
memcpy(&ciphertext[0], &iv, sizeof(iv));
return ciphertext;
}
static std::string encrypt(const crypto::key_image &key_image, const crypto::chacha_key &key)
{
return encrypt(std::string((const char*)&key_image, sizeof(key_image)), key_image, key);
}
static std::string decrypt(const std::string &ciphertext, const crypto::key_image &key_image, const crypto::chacha_key &key)
{
const crypto::chacha_iv iv = make_iv(key_image, key);
std::string plaintext;
THROW_WALLET_EXCEPTION_IF(ciphertext.size() < sizeof(iv), tools::error::wallet_internal_error, "Bad ciphertext text");
plaintext.resize(ciphertext.size() - sizeof(iv));
crypto::chacha20(ciphertext.data() + sizeof(iv), ciphertext.size() - sizeof(iv), key, iv, &plaintext[0]);
return plaintext;
}
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static void store_relative_ring(MDB_txn *txn, MDB_dbi &dbi, const crypto::key_image &key_image, const std::vector<uint64_t> &relative_ring, const crypto::chacha_key &chacha_key)
{
MDB_val key, data;
std::string key_ciphertext = encrypt(key_image, chacha_key);
key.mv_data = (void*)key_ciphertext.data();
key.mv_size = key_ciphertext.size();
std::string compressed_ring = compress_ring(relative_ring);
std::string data_ciphertext = encrypt(compressed_ring, key_image, chacha_key);
data.mv_size = data_ciphertext.size();
data.mv_data = (void*)data_ciphertext.c_str();
int dbr = mdb_put(txn, dbi, &key, &data, 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set ring for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
}
static int resize_env(MDB_env *env, const char *db_path, size_t needed)
{
MDB_envinfo mei;
MDB_stat mst;
int ret;
needed = std::max(needed, (size_t)(100ul * 1024 * 1024)); // at least 100 MB
ret = mdb_env_info(env, &mei);
if (ret)
return ret;
ret = mdb_env_stat(env, &mst);
if (ret)
return ret;
uint64_t size_used = mst.ms_psize * mei.me_last_pgno;
uint64_t mapsize = mei.me_mapsize;
if (size_used + needed > mei.me_mapsize)
{
try
{
boost::filesystem::path path(db_path);
boost::filesystem::space_info si = boost::filesystem::space(path);
if(si.available < needed)
{
MERROR("!! WARNING: Insufficient free space to extend database !!: " << (si.available >> 20L) << " MB available");
return ENOSPC;
}
}
catch(...)
{
// print something but proceed.
MWARNING("Unable to query free disk space.");
}
mapsize += needed;
}
return mdb_env_set_mapsize(env, mapsize);
}
static size_t get_ring_data_size(size_t n_entries)
{
return n_entries * (32 + 1024); // highball 1kB for the ring data to make sure
}
enum { BLACKBALL_BLACKBALL, BLACKBALL_UNBLACKBALL, BLACKBALL_QUERY, BLACKBALL_CLEAR};
namespace tools
{
ringdb::ringdb(std::string filename, const std::string &genesis):
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filename(filename),
env(NULL)
{
MDB_txn *txn;
bool tx_active = false;
int dbr;
tools::create_directories_if_necessary(filename);
dbr = mdb_env_create(&env);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
dbr = mdb_env_set_maxdbs(env, 2);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
const std::string actual_filename = get_rings_filename(filename);
dbr = mdb_env_open(env, actual_filename.c_str(), 0, 0664);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file '"
+ actual_filename + "': " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
dbr = mdb_dbi_open(txn, ("rings-" + genesis).c_str(), MDB_CREATE, &dbi_rings);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
mdb_set_compare(txn, dbi_rings, compare_hash32);
dbr = mdb_dbi_open(txn, ("blackballs2-" + genesis).c_str(), MDB_CREATE | MDB_INTEGERKEY | MDB_DUPSORT | MDB_DUPFIXED, &dbi_blackballs);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
mdb_set_dupsort(txn, dbi_blackballs, compare_uint64);
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn creating/opening database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
}
ringdb::~ringdb()
{
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close();
}
void ringdb::close()
{
if (env)
{
mdb_dbi_close(env, dbi_rings);
mdb_dbi_close(env, dbi_blackballs);
mdb_env_close(env);
env = NULL;
}
}
bool ringdb::add_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), get_ring_data_size(tx.vin.size()));
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
for (const auto &in: tx.vin)
{
if (in.type() != typeid(cryptonote::txin_to_key))
continue;
const auto &txin = boost::get<cryptonote::txin_to_key>(in);
const uint32_t ring_size = txin.key_offsets.size();
if (ring_size == 1)
continue;
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store_relative_ring(txn, dbi_rings, txin.k_image, txin.key_offsets, chacha_key);
}
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn adding ring to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::remove_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
for (const auto &in: tx.vin)
{
if (in.type() != typeid(cryptonote::txin_to_key))
continue;
const auto &txin = boost::get<cryptonote::txin_to_key>(in);
const uint32_t ring_size = txin.key_offsets.size();
if (ring_size == 1)
continue;
MDB_val key, data;
std::string key_ciphertext = encrypt(txin.k_image, chacha_key);
key.mv_data = (void*)key_ciphertext.data();
key.mv_size = key_ciphertext.size();
dbr = mdb_get(txn, dbi_rings, &key, &data);
THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to look for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
if (dbr == MDB_NOTFOUND)
continue;
THROW_WALLET_EXCEPTION_IF(data.mv_size <= 0, tools::error::wallet_internal_error, "Invalid ring data size");
MDEBUG("Removing ring data for key image " << txin.k_image);
dbr = mdb_del(txn, dbi_rings, &key, NULL);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to remove ring to database: " + std::string(mdb_strerror(dbr)));
}
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn removing ring to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::get_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
MDB_val key, data;
std::string key_ciphertext = encrypt(key_image, chacha_key);
key.mv_data = (void*)key_ciphertext.data();
key.mv_size = key_ciphertext.size();
dbr = mdb_get(txn, dbi_rings, &key, &data);
THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to look for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
if (dbr == MDB_NOTFOUND)
return false;
THROW_WALLET_EXCEPTION_IF(data.mv_size <= 0, tools::error::wallet_internal_error, "Invalid ring data size");
std::string data_plaintext = decrypt(std::string((const char*)data.mv_data, data.mv_size), key_image, chacha_key);
outs = decompress_ring(data_plaintext);
MDEBUG("Found ring for key image " << key_image << ":");
MDEBUG("Relative: " << boost::join(outs | boost::adaptors::transformed([](uint64_t out){return std::to_string(out);}), " "));
outs = cryptonote::relative_output_offsets_to_absolute(outs);
MDEBUG("Absolute: " << boost::join(outs | boost::adaptors::transformed([](uint64_t out){return std::to_string(out);}), " "));
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn getting ring from database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::set_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, const std::vector<uint64_t> &outs, bool relative)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), outs.size() * 64);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
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store_relative_ring(txn, dbi_rings, key_image, relative ? outs : cryptonote::absolute_output_offsets_to_relative(outs), chacha_key);
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn setting ring to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::blackball_worker(const std::vector<std::pair<uint64_t, uint64_t>> &outputs, int op)
{
MDB_txn *txn;
MDB_cursor *cursor;
int dbr;
bool tx_active = false;
bool ret = true;
THROW_WALLET_EXCEPTION_IF(outputs.size() > 1 && op == BLACKBALL_QUERY, tools::error::wallet_internal_error, "Blackball query only makes sense for a single output");
dbr = resize_env(env, filename.c_str(), 32 * 2 * outputs.size()); // a pubkey, and some slack
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
dbr = mdb_cursor_open(txn, dbi_blackballs, &cursor);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create cursor for blackballs table: " + std::string(mdb_strerror(dbr)));
MDB_val key, data;
for (const std::pair<uint64_t, uint64_t> &output: outputs)
{
key.mv_data = (void*)&output.first;
key.mv_size = sizeof(output.first);
data.mv_data = (void*)&output.second;
data.mv_size = sizeof(output.second);
switch (op)
{
case BLACKBALL_BLACKBALL:
MDEBUG("Blackballing output " << output.first << "/" << output.second);
dbr = mdb_cursor_put(cursor, &key, &data, MDB_APPENDDUP);
if (dbr == MDB_KEYEXIST)
dbr = 0;
break;
case BLACKBALL_UNBLACKBALL:
MDEBUG("Unblackballing output " << output.first << "/" << output.second);
dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
if (dbr == 0)
dbr = mdb_cursor_del(cursor, 0);
break;
case BLACKBALL_QUERY:
dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to lookup in blackballs table: " + std::string(mdb_strerror(dbr)));
ret = dbr != MDB_NOTFOUND;
if (dbr == MDB_NOTFOUND)
dbr = 0;
break;
case BLACKBALL_CLEAR:
break;
default:
THROW_WALLET_EXCEPTION(tools::error::wallet_internal_error, "Invalid blackball op");
}
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to query blackballs table: " + std::string(mdb_strerror(dbr)));
}
mdb_cursor_close(cursor);
if (op == BLACKBALL_CLEAR)
{
dbr = mdb_drop(txn, dbi_blackballs, 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to clear blackballs table: " + std::string(mdb_strerror(dbr)));
}
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn blackballing output to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return ret;
}
bool ringdb::blackball(const std::vector<std::pair<uint64_t, uint64_t>> &outputs)
{
return blackball_worker(outputs, BLACKBALL_BLACKBALL);
}
bool ringdb::blackball(const std::pair<uint64_t, uint64_t> &output)
{
std::vector<std::pair<uint64_t, uint64_t>> outputs(1, output);
return blackball_worker(outputs, BLACKBALL_BLACKBALL);
}
bool ringdb::unblackball(const std::pair<uint64_t, uint64_t> &output)
{
std::vector<std::pair<uint64_t, uint64_t>> outputs(1, output);
return blackball_worker(outputs, BLACKBALL_UNBLACKBALL);
}
bool ringdb::blackballed(const std::pair<uint64_t, uint64_t> &output)
{
std::vector<std::pair<uint64_t, uint64_t>> outputs(1, output);
return blackball_worker(outputs, BLACKBALL_QUERY);
}
bool ringdb::clear_blackballs()
{
return blackball_worker(std::vector<std::pair<uint64_t, uint64_t>>(), BLACKBALL_CLEAR);
}
}