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correct buffer size for fragments of SessionConfirmed

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orignal 2022-07-12 12:17:58 -04:00
parent f1d3d6a7b5
commit 0c34189d94
3 changed files with 21 additions and 12 deletions
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6
libi2pd/SSU2.cpp
View File

@ -374,7 +374,11 @@ namespace transport
m_LastSession->ProcessData (buf, len);
break;
case eSSU2SessionStateSessionCreatedSent:
m_LastSession->ProcessSessionConfirmed (buf, len);
if (!m_LastSession->ProcessSessionConfirmed (buf, len))
{
m_LastSession->Terminate ();
m_LastSession = nullptr;
}
break;
case eSSU2SessionStateIntroduced:
if (m_LastSession->GetRemoteEndpoint ().address ().is_unspecified ())

14
libi2pd/SSU2Session.cpp
View File

@ -325,7 +325,6 @@ namespace transport
LogPrint (eLogDebug, "SSU2: Resending ", (int)m_State);
m_Server.Send (m_SentHandshakePacket->header.buf, 16, m_SentHandshakePacket->headerX, 48,
m_SentHandshakePacket->payload, m_SentHandshakePacket->payloadSize, m_RemoteEndpoint);
m_SentHandshakePacket->numResends++;
m_SentHandshakePacket->nextResendTime = ts + SSU2_HANDSHAKE_RESEND_INTERVAL;
return;
}
@ -678,22 +677,24 @@ namespace transport
if (!(header.h.flags[0] & 0xF0))
{
// first fragment
if (!m_SessionConfirmedFragment1)
{
m_SessionConfirmedFragment1.reset (new HandshakePacket);
m_SessionConfirmedFragment1->header = header;
memcpy (m_SessionConfirmedFragment1->payload, buf + 16, len - 16);
m_SessionConfirmedFragment1->payloadSize = len - 16;
}
return true; // wait for second fragment
}
else
{
// second fragment
if (!m_SessionConfirmedFragment1) return false; // out of sequence
uint8_t fullMsg[2*SSU2_MTU];
header = m_SessionConfirmedFragment1->header;
memcpy (fullMsg + 16, m_SessionConfirmedFragment1->payload, m_SessionConfirmedFragment1->payloadSize);
memcpy (fullMsg + 16 + m_SessionConfirmedFragment1->payloadSize, buf + 16, len - 16);
buf = fullMsg;
len += m_SessionConfirmedFragment1->payloadSize;
memcpy (m_SessionConfirmedFragment1->payload + m_SessionConfirmedFragment1->payloadSize, buf + 16, len - 16);
m_SessionConfirmedFragment1->payloadSize += (len - 16);
buf = m_SessionConfirmedFragment1->payload - 16;
len = m_SessionConfirmedFragment1->payloadSize + 16;
}
}
// KDF for Session Confirmed part 1
@ -724,6 +725,7 @@ namespace transport
return false;
}
m_NoiseState->MixHash (payload, len - 64); // h = SHA256(h || ciphertext);
if (m_SessionConfirmedFragment1) m_SessionConfirmedFragment1.reset (nullptr);
// payload
// handle RouterInfo block that must be first
if (decryptedPayload[0] != eSSU2BlkRouterInfo)

5
libi2pd/SSU2Session.h
View File

@ -190,10 +190,13 @@ namespace transport
int numResends = 0;
};
struct HandshakePacket: public SentPacket
struct HandshakePacket
{
Header header;
uint8_t headerX[48]; // part1 for SessionConfirmed
uint8_t payload[SSU2_MAX_PACKET_SIZE*2];
size_t payloadSize = 0;
uint32_t nextResendTime = 0; // in seconds
};
typedef std::function<void ()> OnEstablished;