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create transit tunnel and reply for short tunnel build

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orignal 2021-06-07 18:28:36 -04:00
parent 5fb426b336
commit 8571830485
2 changed files with 26 additions and 3 deletions
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20
libi2pd/I2NPProtocol.cpp
View File

@ -424,7 +424,7 @@ namespace i2p
{
uint8_t nonce[12];
memset (nonce, 0, 12);
auto noiseState = std::move (i2p::context.GetCurrentNoiseState ());
auto& noiseState = i2p::context.GetCurrentNoiseState ();
if (!noiseState || !i2p::crypto::AEADChaCha20Poly1305 (reply, TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState->m_H, 32, noiseState->m_CK, nonce, reply, TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
{
@ -609,9 +609,19 @@ namespace i2p
LogPrint (eLogWarning, "I2NP: Can't decrypt short request record ", i);
return;
}
auto& noiseState = i2p::context.GetCurrentNoiseState ();
uint8_t layerKeys[64]; // (layer key, iv key)
i2p::crypto::HKDF (noiseState->m_CK + 32, nullptr, 0, "LayerAndIVKeys", layerKeys); // TODO: correct domain
auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
bufbe32toh (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
layerKeys, layerKeys + 32,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & 0x80,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & 0x40);
i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
// TODO: fill reply
// encrypt reply
auto noiseState = std::move (i2p::context.GetCurrentNoiseState ());
if (!noiseState)
{
LogPrint (eLogWarning, "I2NP: Invalid Noise state for short reply encryption");
@ -622,6 +632,7 @@ namespace i2p
uint8_t * reply = buf + 1;
for (int j = 0; j < num; j++)
{
nonce[4] = j; // nonce is record #
if (j == i)
{
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE - 16,
@ -635,7 +646,10 @@ namespace i2p
i2p::crypto::ChaCha20 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, noiseState->m_CK, nonce, reply);
reply += SHORT_TUNNEL_BUILD_RECORD_SIZE;
}
// TODO: send
// TODO: send reply
transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET,
CreateI2NPMessage (eI2NPShortTunnelBuild, buf, len,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
return;
}
record += SHORT_TUNNEL_BUILD_RECORD_SIZE;

9
libi2pd/I2NPProtocol.h
View File

@ -104,6 +104,15 @@ namespace i2p
// ShortRequestRecordClearText
const size_t SHORT_REQUEST_RECORD_ENCRYPTED_OFFSET = 16;
const size_t SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET = 0;
const size_t SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET = SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET = SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_FLAG_OFFSET = SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET + 32;
const size_t SHORT_REQUEST_RECORD_MORE_FLAGS_OFFSET = SHORT_REQUEST_RECORD_FLAG_OFFSET + 1;
const size_t SHORT_REQUEST_RECORD_LAYER_ENCRYPTION_TYPE = SHORT_REQUEST_RECORD_MORE_FLAGS_OFFSET + 2;
const size_t SHORT_REQUEST_RECORD_REQUEST_TIME_OFFSET = SHORT_REQUEST_RECORD_LAYER_ENCRYPTION_TYPE + 1;
const size_t SHORT_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET = SHORT_REQUEST_RECORD_REQUEST_TIME_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET = SHORT_REQUEST_RECORD_REQUEST_EXPIRATION_OFFSET + 4;
const size_t SHORT_REQUEST_RECORD_CLEAR_TEXT_SIZE = 172;
enum I2NPMessageType