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// Copyright 2017 The Chromium Authors. All rights reserved.
// Copyright (C) 2018 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. 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
// OWNER 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 "config.h"
#include "FidoHidPacket.h"
#if ENABLE(WEB_AUTHN)
#include <algorithm>
namespace fido {
FidoHidPacket::FidoHidPacket(Vector<uint8_t>&& data, uint32_t channelId)
: m_data(WTFMove(data))
, m_channelId(channelId)
{
}
// static
std::unique_ptr<FidoHidInitPacket> FidoHidInitPacket::createFromSerializedData(const Vector<uint8_t>& serialized, size_t* remainingSize)
{
if (!remainingSize || serialized.size() != kHidPacketSize)
return nullptr;
size_t index = 0;
auto channelId = (serialized[index++] & 0xff) << 24;
channelId |= (serialized[index++] & 0xff) << 16;
channelId |= (serialized[index++] & 0xff) << 8;
channelId |= serialized[index++] & 0xff;
auto command = static_cast<FidoHidDeviceCommand>(serialized[index++] & 0x7f);
if (!isFidoHidDeviceCommand(command))
return nullptr;
uint16_t payloadSize = serialized[index++] << 8;
payloadSize |= serialized[index++];
// Check to see if payload is less than maximum size and padded with 0s.
uint16_t dataSize = std::min(payloadSize, static_cast<uint16_t>(kHidPacketSize - index));
// Update remaining size to determine the payload size of follow on packets.
*remainingSize = payloadSize - dataSize;
Vector<uint8_t> data { serialized.begin() + index, dataSize };
return makeUnique<FidoHidInitPacket>(channelId, command, WTFMove(data), payloadSize);
}
// U2F Initialization packet is defined as:
// Offset Length
// 0 4 Channel ID
// 4 1 Command ID
// 5 1 High order packet payload size
// 6 1 Low order packet payload size
// 7 (s-7) Payload data
FidoHidInitPacket::FidoHidInitPacket(uint32_t channelId, FidoHidDeviceCommand cmd, Vector<uint8_t>&& data, uint16_t payloadLength)
: FidoHidPacket(WTFMove(data), channelId)
, m_command(cmd)
, m_payloadLength(payloadLength)
{
}
Vector<uint8_t> FidoHidInitPacket::getSerializedData() const
{
Vector<uint8_t> serialized;
serialized.reserveInitialCapacity(kHidPacketSize);
serialized.append((m_channelId >> 24) & 0xff);
serialized.append((m_channelId >> 16) & 0xff);
serialized.append((m_channelId >> 8) & 0xff);
serialized.append(m_channelId & 0xff);
serialized.append(static_cast<uint8_t>(m_command) | 0x80);
serialized.append((m_payloadLength >> 8) & 0xff);
serialized.append(m_payloadLength & 0xff);
serialized.append(m_data.begin(), m_data.size());
auto offset = serialized.size();
serialized.grow(kHidPacketSize);
memset(serialized.data() + offset, 0, kHidPacketSize - offset);
return serialized;
}
// static
std::unique_ptr<FidoHidContinuationPacket> FidoHidContinuationPacket::createFromSerializedData(const Vector<uint8_t>& serialized, size_t* remainingSize)
{
if (!remainingSize || serialized.size() != kHidPacketSize)
return nullptr;
size_t index = 0;
auto channelId = (serialized[index++] & 0xff) << 24;
channelId |= (serialized[index++] & 0xff) << 16;
channelId |= (serialized[index++] & 0xff) << 8;
channelId |= serialized[index++] & 0xff;
auto sequence = serialized[index++];
// Check to see if packet payload is less than maximum size and padded with 0s.
size_t dataSize = std::min(*remainingSize, kHidPacketSize - index);
*remainingSize -= dataSize;
Vector<uint8_t> data { serialized.begin() + index, dataSize };
return makeUnique<FidoHidContinuationPacket>(channelId, sequence, WTFMove(data));
}
// U2F Continuation packet is defined as:
// Offset Length
// 0 4 Channel ID
// 4 1 Packet sequence 0x00..0x7f
// 5 (s-5) Payload data
FidoHidContinuationPacket::FidoHidContinuationPacket(const uint32_t channelId, const uint8_t sequence, Vector<uint8_t>&& data)
: FidoHidPacket(WTFMove(data), channelId)
, m_sequence(sequence)
{
}
Vector<uint8_t> FidoHidContinuationPacket::getSerializedData() const
{
Vector<uint8_t> serialized;
serialized.reserveInitialCapacity(kHidPacketSize);
serialized.append((m_channelId >> 24) & 0xff);
serialized.append((m_channelId >> 16) & 0xff);
serialized.append((m_channelId >> 8) & 0xff);
serialized.append(m_channelId & 0xff);
serialized.append(m_sequence);
serialized.append(m_data.begin(), m_data.size());
auto offset = serialized.size();
serialized.grow(kHidPacketSize);
memset(serialized.data() + offset, 0, kHidPacketSize - offset);
return serialized;
}
} // namespace fido
#endif // ENABLE(WEB_AUTHN)
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