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// Copyright (c) 2018-2023, 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 <cinttypes>
#include <stdlib.h>
#include <chrono>
#include "include_base_utils.h"
#include "string_tools.h"
#include "rpc_payment_signature.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "daemon.rpc.payment"
#define TIMESTAMP_LEEWAY (60 * 1000000) /* 60 seconds, in microseconds */
namespace cryptonote
{
std::string make_rpc_payment_signature(const crypto::secret_key &skey)
{
std::string s;
crypto::public_key pkey;
crypto::secret_key_to_public_key(skey, pkey);
crypto::signature sig;
const uint64_t now = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
char ts[17];
int ret = snprintf(ts, sizeof(ts), "%16.16" PRIx64, now);
CHECK_AND_ASSERT_MES(ret == 16, "", "snprintf failed");
ts[16] = 0;
CHECK_AND_ASSERT_MES(strlen(ts) == 16, "", "Invalid time conversion");
crypto::hash hash;
crypto::cn_fast_hash(ts, 16, hash);
crypto::generate_signature(hash, pkey, skey, sig);
s = epee::string_tools::pod_to_hex(pkey) + ts + epee::string_tools::pod_to_hex(sig);
return s;
}
bool verify_rpc_payment_signature(const std::string &message, crypto::public_key &pkey, uint64_t &ts)
{
if (message.size() != 2 * sizeof(crypto::public_key) + 16 + 2 * sizeof(crypto::signature))
{
MDEBUG("Bad message size: " << message.size());
return false;
}
const std::string pkey_string = message.substr(0, 2 * sizeof(crypto::public_key));
const std::string ts_string = message.substr(2 * sizeof(crypto::public_key), 16);
const std::string signature_string = message.substr(2 * sizeof(crypto::public_key) + 16);
if (!epee::string_tools::hex_to_pod(pkey_string, pkey))
{
MDEBUG("Bad client id");
return false;
}
crypto::signature signature;
if (!epee::string_tools::hex_to_pod(signature_string, signature))
{
MDEBUG("Bad signature");
return false;
}
crypto::hash hash;
crypto::cn_fast_hash(ts_string.data(), 16, hash);
if (!crypto::check_signature(hash, pkey, signature))
{
MDEBUG("signature does not verify");
return false;
}
char *endptr = NULL;
errno = 0;
unsigned long long ull = strtoull(ts_string.c_str(), &endptr, 16);
if (ull == ULLONG_MAX && errno == ERANGE)
{
MDEBUG("bad timestamp");
return false;
}
ts = ull;
const uint64_t now = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
if (ts > now + TIMESTAMP_LEEWAY)
{
MDEBUG("Timestamp is in the future");
return false;
}
if (ts < now - TIMESTAMP_LEEWAY)
{
MDEBUG("Timestamp is too old");
return false;
}
return true;
}
}
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