mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2025-05-03 12:23:44 +02:00
119 lines
3 KiB
C++
119 lines
3 KiB
C++
/*
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* Copyright (c)2013-2020 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2024-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#include "Locator.hpp"
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namespace ZeroTier {
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bool Locator::sign(const int64_t ts,const Identity &id) noexcept
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{
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uint8_t signData[ZT_LOCATOR_MARSHAL_SIZE_MAX];
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if (!id.hasPrivate())
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return false;
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m_ts = ts;
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if (m_endpointCount > 0)
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std::sort(m_at, m_at + m_endpointCount);
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const unsigned int signLen = marshal(signData,true);
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m_signatureLength = id.sign(signData, signLen, m_signature, sizeof(m_signature));
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return (m_signatureLength > 0);
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}
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bool Locator::verify(const Identity &id) const noexcept
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{
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if ((m_ts == 0) || (m_endpointCount > ZT_LOCATOR_MAX_ENDPOINTS) || (m_signatureLength > ZT_SIGNATURE_BUFFER_SIZE))
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return false;
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uint8_t signData[ZT_LOCATOR_MARSHAL_SIZE_MAX];
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const unsigned int signLen = marshal(signData,true);
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return id.verify(signData, signLen, m_signature, m_signatureLength);
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}
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int Locator::marshal(uint8_t data[ZT_LOCATOR_MARSHAL_SIZE_MAX],const bool excludeSignature) const noexcept
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{
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if ((m_endpointCount > ZT_LOCATOR_MAX_ENDPOINTS) || (m_signatureLength > ZT_SIGNATURE_BUFFER_SIZE))
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return -1;
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data[0] = 0xff; // version byte, currently 0xff to never be the same as byte 0 of an identity for legacy compatibility reasons
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Utils::storeBigEndian<int64_t>(data + 1, m_ts);
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int p = 9;
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if (m_ts > 0) {
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Utils::storeBigEndian(data + p,(uint16_t)m_endpointCount);
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p += 2;
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for (unsigned int i = 0;i < m_endpointCount;++i) {
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int tmp = m_at[i].marshal(data + p);
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if (tmp < 0)
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return -1;
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p += tmp;
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}
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if (!excludeSignature) {
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Utils::storeBigEndian(data + p,(uint16_t)m_signatureLength);
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p += 2;
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Utils::copy(data + p, m_signature, m_signatureLength);
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p += (int)m_signatureLength;
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}
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Utils::storeBigEndian(data + p, m_flags);
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p += 2;
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}
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return p;
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}
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int Locator::unmarshal(const uint8_t *restrict data,const int len) noexcept
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{
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if (len <= (1 + 8 + 2 + 48))
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return -1;
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if (data[0] != 0xff)
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return -1;
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m_ts = Utils::loadBigEndian<int64_t>(data + 1);
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int p = 9;
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if (m_ts > 0) {
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const unsigned int ec = Utils::loadBigEndian<uint16_t>(data + p);
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p += 2;
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if (ec > ZT_LOCATOR_MAX_ENDPOINTS)
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return -1;
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m_endpointCount = ec;
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for (unsigned int i = 0; i < ec; ++i) {
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int tmp = m_at[i].unmarshal(data + p, len - p);
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if (tmp < 0)
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return -1;
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p += tmp;
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}
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if ((p + 2) > len)
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return -1;
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const unsigned int sl = Utils::loadBigEndian<uint16_t>(data + p);
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p += 2;
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if (sl > ZT_SIGNATURE_BUFFER_SIZE)
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return -1;
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m_signatureLength = sl;
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if ((p + (int)sl) > len)
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return -1;
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Utils::copy(m_signature, data + p, sl);
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p += (int)sl;
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if ((p + 2) > len)
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return -1;
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m_flags = Utils::loadBigEndian<uint16_t>(data + p);
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p += 2;
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} else {
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m_ts = 0;
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}
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return p;
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}
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} // namespace ZeroTier
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