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113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
// Copyright (c) 2018-2020, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <cinttypes>
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#include <stdlib.h>
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#include <chrono>
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#include "include_base_utils.h"
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#include "string_tools.h"
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#include "rpc_payment_signature.h"
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "daemon.rpc.payment"
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#define TIMESTAMP_LEEWAY (60 * 1000000) /* 60 seconds, in microseconds */
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namespace cryptonote
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{
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std::string make_rpc_payment_signature(const crypto::secret_key &skey)
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{
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std::string s;
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crypto::public_key pkey;
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crypto::secret_key_to_public_key(skey, pkey);
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crypto::signature sig;
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const uint64_t now = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
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char ts[17];
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int ret = snprintf(ts, sizeof(ts), "%16.16" PRIx64, now);
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CHECK_AND_ASSERT_MES(ret == 16, "", "snprintf failed");
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ts[16] = 0;
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CHECK_AND_ASSERT_MES(strlen(ts) == 16, "", "Invalid time conversion");
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crypto::hash hash;
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crypto::cn_fast_hash(ts, 16, hash);
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crypto::generate_signature(hash, pkey, skey, sig);
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s = epee::string_tools::pod_to_hex(pkey) + ts + epee::string_tools::pod_to_hex(sig);
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return s;
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}
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bool verify_rpc_payment_signature(const std::string &message, crypto::public_key &pkey, uint64_t &ts)
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{
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if (message.size() != 2 * sizeof(crypto::public_key) + 16 + 2 * sizeof(crypto::signature))
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{
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MDEBUG("Bad message size: " << message.size());
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return false;
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}
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const std::string pkey_string = message.substr(0, 2 * sizeof(crypto::public_key));
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const std::string ts_string = message.substr(2 * sizeof(crypto::public_key), 16);
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const std::string signature_string = message.substr(2 * sizeof(crypto::public_key) + 16);
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if (!epee::string_tools::hex_to_pod(pkey_string, pkey))
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{
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MDEBUG("Bad client id");
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return false;
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}
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crypto::signature signature;
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if (!epee::string_tools::hex_to_pod(signature_string, signature))
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{
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MDEBUG("Bad signature");
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return false;
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}
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crypto::hash hash;
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crypto::cn_fast_hash(ts_string.data(), 16, hash);
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if (!crypto::check_signature(hash, pkey, signature))
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{
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MDEBUG("signature does not verify");
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return false;
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}
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char *endptr = NULL;
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errno = 0;
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unsigned long long ull = strtoull(ts_string.c_str(), &endptr, 16);
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if (ull == ULLONG_MAX && errno == ERANGE)
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{
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MDEBUG("bad timestamp");
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return false;
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}
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ts = ull;
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const uint64_t now = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
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if (ts > now + TIMESTAMP_LEEWAY)
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{
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MDEBUG("Timestamp is in the future");
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return false;
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}
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if (ts < now - TIMESTAMP_LEEWAY)
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{
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MDEBUG("Timestamp is too old");
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return false;
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}
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return true;
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}
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}
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