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Code Issues Releases Activity

send SessionCreated before connection close if slock skew

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orignal 2022-02-03 14:49:36 -05:00
parent 0062f7d764
commit c9a1066f02
2 changed files with 19 additions and 10 deletions
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25
libi2pd/NTCP2.cpp
View File

@ -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
*
@ -195,8 +195,9 @@ namespace transport
MixHash (m3p2, m3p2Len); //h = SHA256(h || ciphertext)
}
bool NTCP2Establisher::ProcessSessionRequestMessage (uint16_t& paddingLen)
bool NTCP2Establisher::ProcessSessionRequestMessage (uint16_t& paddingLen, bool& clockSkew)
{
clockSkew = false;
// decrypt X
i2p::crypto::CBCDecryption decryption;
decryption.SetKey (i2p::context.GetIdentHash ());
@ -230,10 +231,11 @@ namespace transport
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint32_t tsA = bufbe32toh (options + 8);
if (tsA < ts - NTCP2_CLOCK_SKEW || tsA > ts + NTCP2_CLOCK_SKEW)
{
{
LogPrint (eLogWarning, "NTCP2: SessionRequest time difference ", (int)(ts - tsA), " exceeds clock skew");
return false;
}
clockSkew = true;
// we send SessionCreate to let Alice know our time and then close session
}
}
else
{
@ -476,9 +478,16 @@ namespace transport
{
LogPrint (eLogDebug, "NTCP2: SessionRequest received ", bytes_transferred);
uint16_t paddingLen = 0;
if (m_Establisher->ProcessSessionRequestMessage (paddingLen))
bool clockSkew = false;
if (m_Establisher->ProcessSessionRequestMessage (paddingLen, clockSkew))
{
if (paddingLen > 0)
if (clockSkew)
{
// we don't care about padding, send SessionCreated and close session
SendSessionCreated ();
m_Server.GetService ().post (std::bind (&NTCP2Session::Terminate, shared_from_this ()));
}
else if (paddingLen > 0)
{
if (paddingLen <= NTCP2_SESSION_REQUEST_MAX_SIZE - 64) // session request is 287 bytes max
{
@ -891,7 +900,7 @@ namespace transport
case eNTCP2BlkTermination:
if (size >= 9)
{
LogPrint (eLogDebug, "NTCP2: Rermination. reason=", (int)(frame[offset + 8]));
LogPrint (eLogDebug, "NTCP2: Termination. reason=", (int)(frame[offset + 8]));
Terminate ();
}
else

4
libi2pd/NTCP2.h
View File

@ -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
*
@ -107,7 +107,7 @@ namespace transport
void CreateSessionConfirmedMessagePart1 (const uint8_t * nonce);
void CreateSessionConfirmedMessagePart2 (const uint8_t * nonce);
bool ProcessSessionRequestMessage (uint16_t& paddingLen);
bool ProcessSessionRequestMessage (uint16_t& paddingLen, bool& clockSkew);
bool ProcessSessionCreatedMessage (uint16_t& paddingLen);
bool ProcessSessionConfirmedMessagePart1 (const uint8_t * nonce);
bool ProcessSessionConfirmedMessagePart2 (const uint8_t * nonce, uint8_t * m3p2Buf);