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check token in SessionRequest

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orignal 2022-03-31 21:07:51 -04:00
parent 2fef595b83
commit 81207999eb
1 changed files with 8 additions and 0 deletions
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8
libi2pd/SSU2.cpp
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@ -239,6 +239,14 @@ namespace transport
uint8_t headerX[48];
i2p::crypto::ChaCha20 (buf + 16, 48, i2p::context.GetSSU2IntroKey (), nonce, headerX);
memcpy (&m_DestConnID, headerX, 8);
uint64_t token;
memcpy (&token, headerX + 8, 8);
if (!token || token != m_Server.GetIncomingToken (m_RemoteEndpoint))
{
LogPrint (eLogDebug, "SSU2: SessionRequest token mismatch. Retry");
SendRetry ();
return;
}
// KDF for session request
m_NoiseState->MixHash ( { {header.buf, 16}, {headerX, 16} } ); // h = SHA256(h || header)
m_NoiseState->MixHash (headerX + 16, 32); // h = SHA256(h || aepk);