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Code Issues Releases Activity

process SessionRequest

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orignal 2022-03-05 18:39:27 -05:00
parent 35542d803c
commit d4ede6ff01
2 changed files with 48 additions and 3 deletions
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47
libi2pd/SSU2.cpp
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@ -35,6 +35,11 @@ namespace transport
// outgoing
InitNoiseXKState1 (*m_NoiseState, addr->s);
}
else
{
// incoming
InitNoiseXKState1 (*m_NoiseState, i2p::context.GetSSU2StaticPublicKey ());
}
}
SSU2Session::~SSU2Session ()
@ -44,7 +49,6 @@ namespace transport
void SSU2Session::SendSessionRequest ()
{
m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
m_NoiseState->MixHash (m_Address->s, 32); // h = SHA256(h || bpk)
Header header;
uint8_t headerX[48], payload[1200]; // TODO: correct payload size
@ -69,18 +73,53 @@ namespace transport
m_EphemeralKeys->Agree (m_Address->s, sharedSecret);
m_NoiseState->MixKey (sharedSecret);
// encrypt
const uint8_t nonce[12] = {0};
i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, m_NoiseState->m_H, 32, m_NoiseState->m_CK + 32, nonce, payload, payloadSize + 16, true);
header.ll[0] ^= CreateHeaderMask (m_Address->i, payload + (payloadSize - 24));
header.ll[1] ^= CreateHeaderMask (m_Address->i, payload + (payloadSize - 12));
const uint8_t nonce[12] = {0};
i2p::crypto::ChaCha20 (headerX, 48, m_Address->i, nonce, headerX);
i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, m_NoiseState->m_H, 32, m_NoiseState->m_CK + 32, nonce, payload, payloadSize + 16, true);
payloadSize += 16;
// send
m_Server.Send (header.buf, 16, headerX, 48, payload, payloadSize, boost::asio::ip::udp::endpoint (m_Address->host, m_Address->port));
}
void SSU2Session::ProcessSessionRequest (uint64_t connID, uint8_t * buf, size_t len)
{
// we are Bob
m_SourceConnID = connID;
Header2 h2;
memcpy (h2.buf, buf, 8);
h2.ll ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), buf + (len - 12));
if (h2.h.type != eSSU2SessionRequest)
{
LogPrint (eLogWarning, "SSU2: Unexpected message type ", (int)h2.h.type);
return;
}
const uint8_t nonce[12] = {0};
uint8_t headerX[48];
i2p::crypto::ChaCha20 (buf + 16, 48, i2p::context.GetSSU2IntroKey (), nonce, headerX);
memcpy (&m_DestConnID, headerX, 8);
// KDF for session request
//m_NoiseState->MixHash (header.buf, 16); // h = SHA256(h || header) TODO: long header
m_NoiseState->MixHash (headerX + 16, 32); // h = SHA256(h || aepk);
uint8_t sharedSecret[32];
i2p::context.GetSSU2StaticKeys ().Agree (headerX + 16, sharedSecret);
m_NoiseState->MixKey (sharedSecret);
// decrypt
uint8_t * payload = buf + 64;
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len - 80, m_NoiseState->m_H, 32, m_NoiseState->m_CK + 32, nonce, payload, len - 80, false))
{
LogPrint (eLogWarning, "SSU2: SessionRequest AEAD verification failed ");
return;
}
// process payload
m_Server.AddSession (m_SourceConnID, shared_from_this ());
}
bool SSU2Session::ProcessSessionCreated (uint8_t * buf, size_t len)
{
// we are Alice
Header2 h2;
memcpy (h2.buf, buf, 8);
uint8_t kh2[32];
@ -147,6 +186,8 @@ namespace transport
else
{
// assume new incoming session
auto session = std::make_shared<SSU2Session> (*this);
session->ProcessSessionRequest (connID, buf, len);
}
}
}

4
libi2pd/SSU2.h
View File

@ -62,6 +62,10 @@ namespace transport
std::shared_ptr<const i2p::data::RouterInfo::Address> addr = nullptr, bool peerTest = false);
~SSU2Session ();
void Done () override {};
void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs) override {};
void ProcessSessionRequest (uint64_t connID, uint8_t * buf, size_t len);
bool ProcessSessionCreated (uint8_t * buf, size_t len);
private: