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adjust clock from SSU2

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orignal 2022-08-08 19:57:48 -04:00
parent 457b3cf168
commit ab606a1121
4 changed files with 41 additions and 8 deletions
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41
libi2pd/SSU2Session.cpp
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@ -720,6 +720,7 @@ namespace transport
}
m_NoiseState->MixHash (payload, len - 64); // h = SHA256(h || encrypted payload from SessionCreated) for SessionConfirmed
// payload
m_State = eSSU2SessionStateSessionCreatedReceived;
HandlePayload (decryptedPayload.data (), decryptedPayload.size ());
m_Server.AddSession (shared_from_this ());
@ -1320,13 +1321,7 @@ namespace transport
{
case eSSU2BlkDateTime:
LogPrint (eLogDebug, "SSU2: Datetime");
if (m_State == eSSU2SessionStateSessionRequestReceived)
{
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint32_t signedOnTime = bufbe32toh (buf + offset);
if (signedOnTime < ts - SSU2_CLOCK_SKEW || signedOnTime > ts + SSU2_CLOCK_SKEW)
m_TerminationReason = eSSU2TerminationReasonClockSkew;
};
HandleDateTime (buf + offset, size);
break;
case eSSU2BlkOptions:
LogPrint (eLogDebug, "SSU2: Options");
@ -1437,6 +1432,38 @@ namespace transport
}
}
void SSU2Session::HandleDateTime (const uint8_t * buf, size_t len)
{
int64_t offset = (int64_t)i2p::util::GetSecondsSinceEpoch () - (int64_t)bufbe32toh (buf);
switch (m_State)
{
case eSSU2SessionStateSessionRequestReceived:
if (std::abs (offset) > SSU2_CLOCK_SKEW)
m_TerminationReason = eSSU2TerminationReasonClockSkew;
break;
case eSSU2SessionStateSessionCreatedReceived:
if ((m_RemoteEndpoint.address ().is_v4 () && i2p::context.GetStatus () == eRouterStatusTesting) ||
(m_RemoteEndpoint.address ().is_v6 () && i2p::context.GetStatusV6 () == eRouterStatusTesting))
{
if (m_Server.IsSyncClockFromPeers ())
{
if (std::abs (offset) > SSU2_CLOCK_THRESHOLD)
{
LogPrint (eLogWarning, "SSU2: Clock adjusted by ", -offset, " seconds");
i2p::util::AdjustTimeOffset (-offset);
}
}
else if (std::abs (offset) > SSU2_CLOCK_SKEW)
{
LogPrint (eLogError, "SSU2: Clock skew detected ", offset, ". Check your clock");
i2p::context.SetError (eRouterErrorClockSkew);
}
}
break;
default: ;
};
}
void SSU2Session::HandleAck (const uint8_t * buf, size_t len)
{
if (m_State == eSSU2SessionStateSessionConfirmedSent)