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handle offline signature

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orignal 2019-02-05 15:32:18 -05:00
parent 841452cb9e
commit 6d9e5147b5
2 changed files with 100 additions and 49 deletions
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144
libi2pd/Streaming.cpp
View File

@ -217,59 +217,15 @@ namespace stream
void Stream::ProcessPacket (Packet * packet)
{
// process flags
uint32_t receivedSeqn = packet->GetSeqn ();
uint16_t flags = packet->GetFlags ();
LogPrint (eLogDebug, "Streaming: Process seqn=", receivedSeqn, ", flags=", flags);
const uint8_t * optionData = packet->GetOptionData ();
if (flags & PACKET_FLAG_DELAY_REQUESTED)
optionData += 2;
if (flags & PACKET_FLAG_FROM_INCLUDED)
if (!ProcessOptions (flags, packet))
{
m_RemoteIdentity = std::make_shared<i2p::data::IdentityEx>(optionData, packet->GetOptionSize ());
if (m_RemoteIdentity->IsRSA ())
{
LogPrint (eLogInfo, "Streaming: Incoming stream from RSA destination ", m_RemoteIdentity->GetIdentHash ().ToBase64 (), " Discarded");
m_LocalDestination.DeletePacket (packet);
Terminate ();
return;
}
optionData += m_RemoteIdentity->GetFullLen ();
if (!m_RemoteLeaseSet)
LogPrint (eLogDebug, "Streaming: Incoming stream from ", m_RemoteIdentity->GetIdentHash ().ToBase64 (), ", sSID=", m_SendStreamID, ", rSID=", m_RecvStreamID);
}
if (flags & PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED)
{
uint16_t maxPacketSize = bufbe16toh (optionData);
LogPrint (eLogDebug, "Streaming: Max packet size ", maxPacketSize);
optionData += 2;
}
if (flags & PACKET_FLAG_SIGNATURE_INCLUDED)
{
uint8_t signature[256];
auto signatureLen = m_RemoteIdentity->GetSignatureLen ();
if(signatureLen <= sizeof(signature))
{
memcpy (signature, optionData, signatureLen);
memset (const_cast<uint8_t *>(optionData), 0, signatureLen);
if (!m_RemoteIdentity->Verify (packet->GetBuffer (), packet->GetLength (), signature))
{
LogPrint (eLogError, "Streaming: Signature verification failed, sSID=", m_SendStreamID, ", rSID=", m_RecvStreamID);
Close ();
flags |= PACKET_FLAG_CLOSE;
}
memcpy (const_cast<uint8_t *>(optionData), signature, signatureLen);
optionData += signatureLen;
}
else
{
LogPrint(eLogError, "Streaming: Signature too big, ", signatureLen, " bytes");
}
m_LocalDestination.DeletePacket (packet);
Terminate ();
return;
}
packet->offset = packet->GetPayload () - packet->buf;
@ -298,6 +254,98 @@ namespace stream
}
}
bool Stream::ProcessOptions (uint16_t flags, Packet * packet)
{
const uint8_t * optionData = packet->GetOptionData ();
size_t optionSize = packet->GetOptionSize ();
if (flags & PACKET_FLAG_DELAY_REQUESTED)
optionData += 2;
if (flags & PACKET_FLAG_FROM_INCLUDED)
{
m_RemoteIdentity = std::make_shared<i2p::data::IdentityEx>(optionData, optionSize);
if (m_RemoteIdentity->IsRSA ())
{
LogPrint (eLogInfo, "Streaming: Incoming stream from RSA destination ", m_RemoteIdentity->GetIdentHash ().ToBase64 (), " Discarded");
return false;
}
optionData += m_RemoteIdentity->GetFullLen ();
if (!m_RemoteLeaseSet)
LogPrint (eLogDebug, "Streaming: Incoming stream from ", m_RemoteIdentity->GetIdentHash ().ToBase64 (), ", sSID=", m_SendStreamID, ", rSID=", m_RecvStreamID);
}
if (flags & PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED)
{
uint16_t maxPacketSize = bufbe16toh (optionData);
LogPrint (eLogDebug, "Streaming: Max packet size ", maxPacketSize);
optionData += 2;
}
if (flags & PACKET_FLAG_OFFLINE_SIGNATURE)
{
if (!m_RemoteIdentity)
{
LogPrint (eLogInfo, "Streaming: offline signature without identity");
return false;
}
const uint8_t * signedData = optionData;
uint32_t expiresTimestamp = bufbe32toh (optionData); optionData += 4; // expires timestamp
if (expiresTimestamp < i2p::util::GetSecondsSinceEpoch ())
{
LogPrint (eLogInfo, "Streaming: offline signature transient key expired");
return false;
}
uint16_t keyType = bufbe16toh (optionData); optionData += 2; // key type
m_TransientVerifier.reset (i2p::data::IdentityEx::CreateVerifier (keyType));
if (!m_TransientVerifier)
{
LogPrint (eLogInfo, "Streaming: Unknown transient key type ", (int)keyType);
return false;
}
auto keyLen = m_TransientVerifier->GetPublicKeyLen ();
if ((optionData - packet->GetOptionData ()) + keyLen + m_RemoteIdentity->GetSignatureLen () > optionSize)
{
LogPrint (eLogInfo, "Streaming: Option data is too short ", (int)optionSize);
return false;
}
m_TransientVerifier->SetPublicKey (optionData); optionData += keyLen; // key
if (!m_RemoteIdentity->Verify (signedData, keyLen + 6, optionData))
{
LogPrint (eLogError, "Streaming: Transient key signature verification failed");
return false;
}
optionData += m_RemoteIdentity->GetSignatureLen (); // signature
}
if (flags & PACKET_FLAG_SIGNATURE_INCLUDED)
{
uint8_t signature[256];
auto signatureLen = m_RemoteIdentity->GetSignatureLen ();
if(signatureLen <= sizeof(signature))
{
memcpy (signature, optionData, signatureLen);
memset (const_cast<uint8_t *>(optionData), 0, signatureLen);
bool verified = m_TransientVerifier ?
m_TransientVerifier->Verify (packet->GetBuffer (), packet->GetLength (), signature) :
m_RemoteIdentity->Verify (packet->GetBuffer (), packet->GetLength (), signature);
if (!verified)
{
LogPrint (eLogError, "Streaming: Signature verification failed, sSID=", m_SendStreamID, ", rSID=", m_RecvStreamID);
Close ();
flags |= PACKET_FLAG_CLOSE;
}
memcpy (const_cast<uint8_t *>(optionData), signature, signatureLen);
optionData += signatureLen;
}
else
{
LogPrint (eLogError, "Streaming: Signature too big, ", signatureLen, " bytes");
return false;
}
}
return true;
}
void Stream::ProcessAck (Packet * packet)
{
bool acknowledged = false;

3
libi2pd/Streaming.h
View File

@ -38,6 +38,7 @@ namespace stream
const uint16_t PACKET_FLAG_PROFILE_INTERACTIVE = 0x0100;
const uint16_t PACKET_FLAG_ECHO = 0x0200;
const uint16_t PACKET_FLAG_NO_ACK = 0x0400;
const uint16_t PACKET_FLAG_OFFLINE_SIGNATURE = 0x0800;
const size_t STREAMING_MTU = 1730;
const size_t MAX_PACKET_SIZE = 4096;
@ -195,6 +196,7 @@ namespace stream
void SavePacket (Packet * packet);
void ProcessPacket (Packet * packet);
bool ProcessOptions (uint16_t flags, Packet * packet);
void ProcessAck (Packet * packet);
size_t ConcatenatePackets (uint8_t * buf, size_t len);
@ -216,6 +218,7 @@ namespace stream
bool m_IsAckSendScheduled;
StreamingDestination& m_LocalDestination;
std::shared_ptr<const i2p::data::IdentityEx> m_RemoteIdentity;
std::unique_ptr<i2p::crypto::Verifier> m_TransientVerifier; // in case of offline key
std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
std::shared_ptr<const i2p::data::Lease> m_CurrentRemoteLease;