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adjust clock from SSU SessionCreated is time difference exceeds 15 seconds

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orignal 2022-02-01 18:43:11 -05:00
parent 03bcdceb9b
commit 19cc1c3b3f
7 changed files with 43 additions and 21 deletions
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31
libi2pd/SSUSession.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2021, The PurpleI2P Project
* Copyright (c) 2013-2022, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
@ -274,16 +274,7 @@ namespace transport
s.Insert (payload, 8); // relayTag and signed on time
m_RelayTag = bufbe32toh (payload);
payload += 4; // relayTag
if (ourIP.is_v4 () && i2p::context.GetStatus () == eRouterStatusTesting)
{
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint32_t signedOnTime = bufbe32toh(payload);
if (signedOnTime < ts - SSU_CLOCK_SKEW || signedOnTime > ts + SSU_CLOCK_SKEW)
{
LogPrint (eLogError, "SSU: Clock skew detected ", (int)ts - signedOnTime, ". Check your clock");
i2p::context.SetError (eRouterErrorClockSkew);
}
}
uint32_t signedOnTime = bufbe32toh(payload);
payload += 4; // signed on time
// decrypt signature
size_t signatureLen = m_RemoteIdentity->GetSignatureLen ();
@ -295,6 +286,24 @@ namespace transport
// verify signature
if (s.Verify (m_RemoteIdentity, payload))
{
if (ourIP.is_v4 () && i2p::context.GetStatus () == eRouterStatusTesting)
{
auto ts = i2p::util::GetSecondsSinceEpoch ();
int offset = (int)ts - signedOnTime;
if (m_Server.IsSyncClockFromPeers ())
{
if (std::abs (offset) > SSU_CLOCK_THRESHOLD)
{
LogPrint (eLogWarning, "SSU: Clock adjusted by ", -offset, " seconds");
i2p::util::AdjustTimeOffset (-offset);
}
}
else if (std::abs (offset) > SSU_CLOCK_SKEW)
{
LogPrint (eLogError, "SSU: Clock skew detected ", offset, ". Check your clock");
i2p::context.SetError (eRouterErrorClockSkew);
}
}
LogPrint (eLogInfo, "SSU: Our external address is ", ourIP.to_string (), ":", ourPort);
if (!i2p::util::net::IsInReservedRange (ourIP))
{