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merge bitcoin#28525: Drop v2 garbage authentication packet
This commit is contained in:
parent
662394cd49
commit
63b13aa519
76
src/net.cpp
76
src/net.cpp
@ -1098,8 +1098,7 @@ void V2Transport::StartSendingHandshake() noexcept
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m_send_buffer.resize(EllSwiftPubKey::size() + m_send_garbage.size());
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std::copy(std::begin(m_cipher.GetOurPubKey()), std::end(m_cipher.GetOurPubKey()), MakeWritableByteSpan(m_send_buffer).begin());
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std::copy(m_send_garbage.begin(), m_send_garbage.end(), m_send_buffer.begin() + EllSwiftPubKey::size());
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// We cannot wipe m_send_garbage as it will still be used to construct the garbage
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// authentication packet.
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// We cannot wipe m_send_garbage as it will still be used as AAD later in the handshake.
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}
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V2Transport::V2Transport(NodeId nodeid, bool initiating, int type_in, int version_in, const CKey& key, Span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept :
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@ -1133,9 +1132,6 @@ void V2Transport::SetReceiveState(RecvState recv_state) noexcept
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Assume(recv_state == RecvState::GARB_GARBTERM);
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break;
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case RecvState::GARB_GARBTERM:
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Assume(recv_state == RecvState::GARBAUTH);
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break;
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case RecvState::GARBAUTH:
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Assume(recv_state == RecvState::VERSION);
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break;
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case RecvState::VERSION:
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@ -1267,25 +1263,16 @@ bool V2Transport::ProcessReceivedKeyBytes() noexcept
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m_cipher.GetSendGarbageTerminator().end(),
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MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN).begin());
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// Construct garbage authentication packet in the send buffer (using the garbage data which
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// is still there).
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m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION);
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m_cipher.Encrypt(
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/*contents=*/{},
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/*aad=*/MakeByteSpan(m_send_garbage),
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/*ignore=*/false,
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/*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION));
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// We no longer need the garbage.
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m_send_garbage.clear();
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m_send_garbage.shrink_to_fit();
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// Construct version packet in the send buffer.
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// Construct version packet in the send buffer, with the sent garbage data as AAD.
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m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION + VERSION_CONTENTS.size());
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m_cipher.Encrypt(
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/*contents=*/VERSION_CONTENTS,
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/*aad=*/{},
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/*aad=*/MakeByteSpan(m_send_garbage),
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/*ignore=*/false,
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/*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION + VERSION_CONTENTS.size()));
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// We no longer need the garbage.
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m_send_garbage.clear();
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m_send_garbage.shrink_to_fit();
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} else {
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// We still have to receive more key bytes.
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}
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@ -1299,11 +1286,11 @@ bool V2Transport::ProcessReceivedGarbageBytes() noexcept
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Assume(m_recv_buffer.size() <= MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
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if (m_recv_buffer.size() >= BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
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if (MakeByteSpan(m_recv_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN) == m_cipher.GetReceiveGarbageTerminator()) {
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// Garbage terminator received. Switch to receiving garbage authentication packet.
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m_recv_garbage = std::move(m_recv_buffer);
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m_recv_garbage.resize(m_recv_garbage.size() - BIP324Cipher::GARBAGE_TERMINATOR_LEN);
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// Garbage terminator received. Store garbage to authenticate it as AAD later.
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m_recv_aad = std::move(m_recv_buffer);
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m_recv_aad.resize(m_recv_aad.size() - BIP324Cipher::GARBAGE_TERMINATOR_LEN);
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m_recv_buffer.clear();
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SetReceiveState(RecvState::GARBAUTH);
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SetReceiveState(RecvState::VERSION);
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} else if (m_recv_buffer.size() == MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
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// We've reached the maximum length for garbage + garbage terminator, and the
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// terminator still does not match. Abort.
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@ -1322,8 +1309,7 @@ bool V2Transport::ProcessReceivedGarbageBytes() noexcept
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bool V2Transport::ProcessReceivedPacketBytes() noexcept
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{
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AssertLockHeld(m_recv_mutex);
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Assume(m_recv_state == RecvState::GARBAUTH || m_recv_state == RecvState::VERSION ||
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m_recv_state == RecvState::APP);
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Assume(m_recv_state == RecvState::VERSION || m_recv_state == RecvState::APP);
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// The maximum permitted contents length for a packet, consisting of:
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// - 0x00 byte: indicating long message type encoding
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@ -1346,45 +1332,38 @@ bool V2Transport::ProcessReceivedPacketBytes() noexcept
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// as GetMaxBytesToProcess only allows up to LENGTH_LEN into the buffer before that point.
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m_recv_decode_buffer.resize(m_recv_len);
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bool ignore{false};
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Span<const std::byte> aad;
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if (m_recv_state == RecvState::GARBAUTH) aad = MakeByteSpan(m_recv_garbage);
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bool ret = m_cipher.Decrypt(
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/*input=*/MakeByteSpan(m_recv_buffer).subspan(BIP324Cipher::LENGTH_LEN),
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/*aad=*/aad,
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/*aad=*/MakeByteSpan(m_recv_aad),
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/*ignore=*/ignore,
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/*contents=*/MakeWritableByteSpan(m_recv_decode_buffer));
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if (!ret) {
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LogPrint(BCLog::NET, "V2 transport error: packet decryption failure (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
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return false;
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}
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// We have decrypted a valid packet with the AAD we expected, so clear the expected AAD.
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m_recv_aad.clear();
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m_recv_aad.shrink_to_fit();
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// Feed the last 4 bytes of the Poly1305 authentication tag (and its timing) into our RNG.
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RandAddEvent(ReadLE32(m_recv_buffer.data() + m_recv_buffer.size() - 4));
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// At this point we have a valid packet decrypted into m_recv_decode_buffer. Depending on
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// the current state, decide what to do with it.
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switch (m_recv_state) {
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case RecvState::GARBAUTH:
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// Ignore flag does not matter for garbage authentication. Any valid packet functions
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// as authentication. Receive and process the version packet next.
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SetReceiveState(RecvState::VERSION);
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m_recv_garbage = {};
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break;
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case RecvState::VERSION:
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if (!ignore) {
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// At this point we have a valid packet decrypted into m_recv_decode_buffer. If it's not a
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// decoy, which we simply ignore, use the current state to decide what to do with it.
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if (!ignore) {
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switch (m_recv_state) {
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case RecvState::VERSION:
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// Version message received; transition to application phase. The contents is
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// ignored, but can be used for future extensions.
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SetReceiveState(RecvState::APP);
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}
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break;
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case RecvState::APP:
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if (!ignore) {
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break;
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case RecvState::APP:
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// Application message decrypted correctly. It can be extracted using GetMessage().
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SetReceiveState(RecvState::APP_READY);
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break;
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default:
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// Any other state is invalid (this function should not have been called).
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Assume(false);
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}
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break;
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default:
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// Any other state is invalid (this function should not have been called).
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Assume(false);
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}
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// Wipe the receive buffer where the next packet will be received into.
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m_recv_buffer = {};
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@ -1420,7 +1399,6 @@ size_t V2Transport::GetMaxBytesToProcess() noexcept
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case RecvState::GARB_GARBTERM:
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// Process garbage bytes one by one (because terminator may appear anywhere).
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return 1;
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case RecvState::GARBAUTH:
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case RecvState::VERSION:
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case RecvState::APP:
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// These three states all involve decoding a packet. Process the length descriptor first,
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@ -1474,7 +1452,6 @@ bool V2Transport::ReceivedBytes(Span<const uint8_t>& msg_bytes) noexcept
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// bytes).
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m_recv_buffer.reserve(MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
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break;
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case RecvState::GARBAUTH:
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case RecvState::VERSION:
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case RecvState::APP: {
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// During states where a packet is being received, as much as is expected but never
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@ -1518,7 +1495,6 @@ bool V2Transport::ReceivedBytes(Span<const uint8_t>& msg_bytes) noexcept
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if (!ProcessReceivedGarbageBytes()) return false;
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break;
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case RecvState::GARBAUTH:
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case RecvState::VERSION:
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case RecvState::APP:
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if (!ProcessReceivedPacketBytes()) return false;
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41
src/net.h
41
src/net.h
@ -496,10 +496,10 @@ private:
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*
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* start(responder)
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* |
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* | start(initiator) /---------\
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* | | | |
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* v v v |
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* KEY_MAYBE_V1 -> KEY -> GARB_GARBTERM -> GARBAUTH -> VERSION -> APP -> APP_READY
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* | start(initiator) /---------\
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* | | | |
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* v v v |
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* KEY_MAYBE_V1 -> KEY -> GARB_GARBTERM -> VERSION -> APP -> APP_READY
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* |
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* \-------> V1
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*/
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@ -521,24 +521,19 @@ private:
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/** Garbage and garbage terminator.
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*
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* Whenever a byte is received, the last 16 bytes are compared with the expected garbage
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* terminator. When that happens, the state becomes GARBAUTH. If no matching terminator is
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* terminator. When that happens, the state becomes VERSION. If no matching terminator is
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* received in 4111 bytes (4095 for the maximum garbage length, and 16 bytes for the
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* terminator), the connection aborts. */
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GARB_GARBTERM,
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/** Garbage authentication packet.
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*
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* A packet is received, and decrypted/verified with AAD set to the garbage received during
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* the GARB_GARBTERM state. If that succeeds, the state becomes VERSION. If it fails the
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* connection aborts. */
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GARBAUTH,
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/** Version packet.
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*
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* A packet is received, and decrypted/verified. If that succeeds, the state becomes APP,
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* and the decrypted contents is interpreted as version negotiation (currently, that means
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* ignoring it, but it can be used for negotiating future extensions). If it fails, the
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* connection aborts. */
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* A packet is received, and decrypted/verified. If that fails, the connection aborts. The
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* first received packet in this state (whether it's a decoy or not) is expected to
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* authenticate the garbage received during the GARB_GARBTERM state as associated
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* authenticated data (AAD). The first non-decoy packet in this state is interpreted as
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* version negotiation (currently, that means ignoring the contents, but it can be used for
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* negotiating future extensions), and afterwards the state becomes APP. */
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VERSION,
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/** Application packet.
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@ -592,9 +587,9 @@ private:
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/** Normal sending state.
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*
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* In this state, the ciphers are initialized, so packets can be sent. When this state is
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* entered, the garbage terminator, garbage authentication packet, and version
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* packet are appended to the send buffer (in addition to the key and garbage which may
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* still be there). In this state a message can be provided if the send buffer is empty. */
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* entered, the garbage terminator and version packet are appended to the send buffer (in
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* addition to the key and garbage which may still be there). In this state a message can be
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* provided if the send buffer is empty. */
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READY,
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/** This transport is using v1 fallback.
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@ -614,13 +609,13 @@ private:
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/** Lock for receiver-side fields. */
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mutable Mutex m_recv_mutex ACQUIRED_BEFORE(m_send_mutex);
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/** In {GARBAUTH, VERSION, APP}, the decrypted packet length, if m_recv_buffer.size() >=
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/** In {VERSION, APP}, the decrypted packet length, if m_recv_buffer.size() >=
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* BIP324Cipher::LENGTH_LEN. Unspecified otherwise. */
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uint32_t m_recv_len GUARDED_BY(m_recv_mutex) {0};
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/** Receive buffer; meaning is determined by m_recv_state. */
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std::vector<uint8_t> m_recv_buffer GUARDED_BY(m_recv_mutex);
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/** During GARBAUTH, the garbage received during GARB_GARBTERM. */
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std::vector<uint8_t> m_recv_garbage GUARDED_BY(m_recv_mutex);
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/** AAD expected in next received packet (currently used only for garbage). */
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std::vector<uint8_t> m_recv_aad GUARDED_BY(m_recv_mutex);
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/** Buffer to put decrypted contents in, for converting to CNetMessage. */
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std::vector<uint8_t> m_recv_decode_buffer GUARDED_BY(m_recv_mutex);
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/** Deserialization type. */
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@ -660,7 +655,7 @@ private:
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bool ProcessReceivedKeyBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex, !m_send_mutex);
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/** Process bytes in m_recv_buffer, while in GARB_GARBTERM state. */
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bool ProcessReceivedGarbageBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
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/** Process bytes in m_recv_buffer, while in GARBAUTH/VERSION/APP state. */
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/** Process bytes in m_recv_buffer, while in VERSION/APP state. */
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bool ProcessReceivedPacketBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
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public:
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@ -1038,9 +1038,11 @@ class V2TransportTester
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bool m_test_initiator; //!< Whether m_transport is the initiator (true) or responder (false)
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std::vector<uint8_t> m_sent_garbage; //!< The garbage we've sent to m_transport.
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std::vector<uint8_t> m_recv_garbage; //!< The garbage we've received from m_transport.
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std::vector<uint8_t> m_to_send; //!< Bytes we have queued up to send to m_transport.
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std::vector<uint8_t> m_received; //!< Bytes we have received from m_transport.
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std::deque<CSerializedNetMsg> m_msg_to_send; //!< Messages to be sent *by* m_transport to us.
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bool m_sent_aad{false};
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public:
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/** Construct a tester object. test_initiator: whether the tested transport is initiator. */
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@ -1138,8 +1140,7 @@ public:
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/** Schedule specified garbage to be sent to the transport. */
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void SendGarbage(Span<const uint8_t> garbage)
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{
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// Remember the specified garbage (so we can use it for constructing the garbage
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// authentication packet).
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// Remember the specified garbage (so we can use it as AAD).
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m_sent_garbage.assign(garbage.begin(), garbage.end());
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// Schedule it for sending.
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Send(m_sent_garbage);
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@ -1198,27 +1199,27 @@ public:
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Send(ciphertext);
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}
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/** Schedule garbage terminator and authentication packet to be sent to the transport (only
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* after ReceiveKey). */
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void SendGarbageTermAuth(size_t garb_auth_data_len = 0, bool garb_auth_ignore = false)
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/** Schedule garbage terminator to be sent to the transport (only after ReceiveKey). */
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void SendGarbageTerm()
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{
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// Generate random data to include in the garbage authentication packet (ignored by peer).
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auto garb_auth_data = g_insecure_rand_ctx.randbytes<uint8_t>(garb_auth_data_len);
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// Schedule the garbage terminator to be sent.
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Send(m_cipher.GetSendGarbageTerminator());
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// Schedule the garbage authentication packet to be sent.
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SendPacket(/*content=*/garb_auth_data, /*aad=*/m_sent_garbage, /*ignore=*/garb_auth_ignore);
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}
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/** Schedule version packet to be sent to the transport (only after ReceiveKey). */
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void SendVersion(Span<const uint8_t> version_data = {}, bool vers_ignore = false)
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{
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SendPacket(/*content=*/version_data, /*aad=*/{}, /*ignore=*/vers_ignore);
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Span<const std::uint8_t> aad;
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// Set AAD to garbage only for first packet.
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if (!m_sent_aad) aad = m_sent_garbage;
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SendPacket(/*content=*/version_data, /*aad=*/aad, /*ignore=*/vers_ignore);
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m_sent_aad = true;
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}
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/** Expect a packet to have been received from transport, process it, and return its contents
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* (only after ReceiveKey). By default, decoys are skipped. */
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std::vector<uint8_t> ReceivePacket(Span<const std::byte> aad = {}, bool skip_decoy = true)
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* (only after ReceiveKey). Decoys are skipped. Optional associated authenticated data (AAD) is
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* expected in the first received packet, no matter if that is a decoy or not. */
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std::vector<uint8_t> ReceivePacket(Span<const std::byte> aad = {})
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{
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std::vector<uint8_t> contents;
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// Loop as long as there are ignored packets that are to be skipped.
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@ -1239,16 +1240,18 @@ public:
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/*ignore=*/ignore,
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/*contents=*/MakeWritableByteSpan(contents));
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BOOST_CHECK(ret);
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// Don't expect AAD in further packets.
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aad = {};
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// Strip the processed packet's bytes off the front of the receive buffer.
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m_received.erase(m_received.begin(), m_received.begin() + size + BIP324Cipher::EXPANSION);
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// Stop if the ignore bit is not set on this packet, or if we choose to not honor it.
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if (!ignore || !skip_decoy) break;
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// Stop if the ignore bit is not set on this packet.
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if (!ignore) break;
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}
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return contents;
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}
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/** Expect garbage, garbage terminator, and garbage auth packet to have been received, and
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* process them (only after ReceiveKey). */
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/** Expect garbage and garbage terminator to have been received, and process them (only after
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* ReceiveKey). */
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void ReceiveGarbage()
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{
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// Figure out the garbage length.
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@ -1259,18 +1262,15 @@ public:
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if (term_span == m_cipher.GetReceiveGarbageTerminator()) break;
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}
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// Copy the garbage to a buffer.
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std::vector<uint8_t> garbage(m_received.begin(), m_received.begin() + garblen);
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m_recv_garbage.assign(m_received.begin(), m_received.begin() + garblen);
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// Strip garbage + garbage terminator off the front of the receive buffer.
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m_received.erase(m_received.begin(), m_received.begin() + garblen + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
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// Process the expected garbage authentication packet. Such a packet still functions as one
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// even when its ignore bit is set to true, so we do not skip decoy packets here.
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ReceivePacket(/*aad=*/MakeByteSpan(garbage), /*skip_decoy=*/false);
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}
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/** Expect version packet to have been received, and process it (only after ReceiveKey). */
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void ReceiveVersion()
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{
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auto contents = ReceivePacket();
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auto contents = ReceivePacket(/*aad=*/MakeByteSpan(m_recv_garbage));
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// Version packets from real BIP324 peers are expected to be empty, despite the fact that
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// this class supports *sending* non-empty version packets (to test that BIP324 peers
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// correctly ignore version packet contents).
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@ -1347,7 +1347,7 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
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tester.SendKey();
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tester.SendGarbage();
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tester.ReceiveKey();
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tester.SendGarbageTermAuth();
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tester.SendGarbageTerm();
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tester.SendVersion();
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ret = tester.Interact();
|
||||
BOOST_REQUIRE(ret && ret->empty());
|
||||
@ -1387,7 +1387,7 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
|
||||
auto ret = tester.Interact();
|
||||
BOOST_REQUIRE(ret && ret->empty());
|
||||
tester.ReceiveKey();
|
||||
tester.SendGarbageTermAuth();
|
||||
tester.SendGarbageTerm();
|
||||
tester.SendVersion();
|
||||
ret = tester.Interact();
|
||||
BOOST_REQUIRE(ret && ret->empty());
|
||||
@ -1415,10 +1415,6 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
|
||||
bool initiator = InsecureRandBool();
|
||||
/** Use either 0 bytes or the maximum possible (4095 bytes) garbage length. */
|
||||
size_t garb_len = InsecureRandBool() ? 0 : V2Transport::MAX_GARBAGE_LEN;
|
||||
/** Sometimes, use non-empty contents in the garbage authentication packet (which is to be ignored). */
|
||||
size_t garb_auth_data_len = InsecureRandBool() ? 0 : InsecureRandRange(100000);
|
||||
/** Whether to set the ignore bit on the garbage authentication packet (it still functions as garbage authentication). */
|
||||
bool garb_ignore = InsecureRandBool();
|
||||
/** How many decoy packets to send before the version packet. */
|
||||
unsigned num_ignore_version = InsecureRandRange(10);
|
||||
/** What data to send in the version packet (ignored by BIP324 peers, but reserved for future extensions). */
|
||||
@ -1439,7 +1435,7 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
|
||||
tester.SendGarbage(garb_len);
|
||||
}
|
||||
tester.ReceiveKey();
|
||||
tester.SendGarbageTermAuth(garb_auth_data_len, garb_ignore);
|
||||
tester.SendGarbageTerm();
|
||||
for (unsigned v = 0; v < num_ignore_version; ++v) {
|
||||
size_t ver_ign_data_len = InsecureRandBool() ? 0 : InsecureRandRange(1000);
|
||||
auto ver_ign_data = g_insecure_rand_ctx.randbytes<uint8_t>(ver_ign_data_len);
|
||||
@ -1483,7 +1479,7 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
|
||||
tester.SendKey();
|
||||
tester.SendGarbage(V2Transport::MAX_GARBAGE_LEN + 1);
|
||||
tester.ReceiveKey();
|
||||
tester.SendGarbageTermAuth();
|
||||
tester.SendGarbageTerm();
|
||||
ret = tester.Interact();
|
||||
BOOST_CHECK(!ret);
|
||||
}
|
||||
@ -1496,7 +1492,7 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
|
||||
auto ret = tester.Interact();
|
||||
BOOST_REQUIRE(ret && ret->empty());
|
||||
tester.ReceiveKey();
|
||||
tester.SendGarbageTermAuth();
|
||||
tester.SendGarbageTerm();
|
||||
ret = tester.Interact();
|
||||
BOOST_CHECK(!ret);
|
||||
}
|
||||
@ -1521,7 +1517,7 @@ BOOST_AUTO_TEST_CASE(v2transport_test)
|
||||
// the first 15 of them match.
|
||||
garbage[len_before + 15] ^= (uint8_t(1) << InsecureRandRange(8));
|
||||
tester.SendGarbage(garbage);
|
||||
tester.SendGarbageTermAuth();
|
||||
tester.SendGarbageTerm();
|
||||
tester.SendVersion();
|
||||
ret = tester.Interact();
|
||||
BOOST_REQUIRE(ret && ret->empty());
|
||||
|
Loading…
Reference in New Issue
Block a user