size_t GarlicRoutingSession::CreateGarlicClove (uint8_t * buf, std::shared_ptr<const I2NPMessage> msg, bool isDestination)
{
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 8000; // 8 sec
size_t size = 0;
if (isDestination)
{
buf[size] = eGarlicDeliveryTypeDestination << 5;// delivery instructions flag destination
size++;
memcpy (buf + size, m_Destination->GetIdentHash (), 32);
size += 32;
}
else
{
buf[size] = 0;// delivery instructions flag local
size++;
}
memcpy (buf + size, msg->GetBuffer (), msg->GetLength ());
size += msg->GetLength ();
uint32_t cloveID;
RAND_bytes ((uint8_t *)&cloveID, 4);
htobe32buf (buf + size, cloveID); // CloveID
size += 4;
htobe64buf (buf + size, ts); // Expiration of clove
size += 8;
memset (buf + size, 0, 3); // certificate of clove
size += 3;
return size;
}
size_t GarlicRoutingSession::CreateGarlicPayload (uint8_t * payload, std::shared_ptr<const I2NPMessage> msg, UnconfirmedTags * newTags)
{
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 8000; // 8 sec
uint32_t msgID;
RAND_bytes ((uint8_t *)&msgID, 4);
size_t size = 0;
uint8_t * numCloves = payload + size;
*numCloves = 0;
size++;
if (m_Owner)
{
// resubmit non-confirmed LeaseSet
if (m_LeaseSetUpdateStatus == eLeaseSetSubmitted &&
i2p::util::GetMillisecondsSinceEpoch () > m_LeaseSetSubmissionTime + LEASET_CONFIRMATION_TIMEOUT)
m_LeaseSetUpdateStatus = eLeaseSetUpdated;
// attach DeviveryStatus if necessary
if (newTags || m_LeaseSetUpdateStatus == eLeaseSetUpdated) // new tags created or leaseset updated
{
// clove is DeliveryStatus
auto cloveSize = CreateDeliveryStatusClove (payload + size, msgID);
if (cloveSize > 0) // successive?
{
size += cloveSize;
(*numCloves)++;
if (newTags) // new tags created
m_UnconfirmedTagsMsgs[msgID] = newTags;
m_Owner->DeliveryStatusSent (shared_from_this (), msgID);
}
else
LogPrint (eLogWarning, "Garlic: DeliveryStatus clove was not created");
}
// attach LeaseSet
if (m_LeaseSetUpdateStatus == eLeaseSetUpdated)
{
m_LeaseSetUpdateStatus = eLeaseSetSubmitted;
m_LeaseSetUpdateMsgID = msgID;
m_LeaseSetSubmissionTime = i2p::util::GetMillisecondsSinceEpoch ();
// clove if our leaseSet must be attached
auto leaseSet = CreateDatabaseStoreMsg (m_Owner->GetLeaseSet ());
size += CreateGarlicClove (payload + size, leaseSet, false);
(*numCloves)++;
}
}
if (msg) // clove message ifself if presented
{
size += CreateGarlicClove (payload + size, msg, m_Destination ? m_Destination->IsDestination () : false);
(*numCloves)++;
}
memset (payload + size, 0, 3); // certificate of message
size += 3;
htobe32buf (payload + size, msgID); // MessageID
size += 4;
htobe64buf (payload + size, ts); // Expiration of message
size += 8;
return size;
}
std::shared_ptr<I2NPMessage> CreateDeliveryStatusMsg (uint32_t msgID)
{
auto m = NewI2NPShortMessage ();
uint8_t * buf = m->GetPayload ();
if (msgID)
{
htobe32buf (buf + DELIVERY_STATUS_MSGID_OFFSET, msgID);
htobe64buf (buf + DELIVERY_STATUS_TIMESTAMP_OFFSET, i2p::util::GetMillisecondsSinceEpoch ());
}
else // for SSU establishment
{
RAND_bytes ((uint8_t *)&msgID, 4);
htobe32buf (buf + DELIVERY_STATUS_MSGID_OFFSET, msgID);
htobe64buf (buf + DELIVERY_STATUS_TIMESTAMP_OFFSET, 2); // netID = 2
}
m->len += DELIVERY_STATUS_SIZE;
m->FillI2NPMessageHeader (eI2NPDeliveryStatus);
return m;
}
size_t GarlicRoutingSession::CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID)
{
size_t size = 0;
if (m_Owner)
{
auto inboundTunnel = m_Owner->GetTunnelPool ()->GetNextInboundTunnel ();
if (inboundTunnel)
{
buf[size] = eGarlicDeliveryTypeTunnel << 5; // delivery instructions flag tunnel
size++;
// hash and tunnelID sequence is reversed for Garlic
memcpy (buf + size, inboundTunnel->GetNextIdentHash (), 32); // To Hash
size += 32;
htobe32buf (buf + size, inboundTunnel->GetNextTunnelID ()); // tunnelID
size += 4;
// create msg
auto msg = CreateDeliveryStatusMsg (msgID);
if (m_Owner)
{
//encrypt
uint8_t key[32], tag[32];
RAND_bytes (key, 32); // random session key
RAND_bytes (tag, 32); // random session tag
m_Owner->SubmitSessionKey (key, tag);
GarlicRoutingSession garlic (key, tag);
msg = garlic.WrapSingleMessage (msg);
}
memcpy (buf + size, msg->GetBuffer (), msg->GetLength ());
size += msg->GetLength ();
// fill clove
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 8000; // 8 sec
uint32_t cloveID;
RAND_bytes ((uint8_t *)&cloveID, 4);
htobe32buf (buf + size, cloveID); // CloveID
size += 4;
htobe64buf (buf + size, ts); // Expiration of clove
size += 8;
memset (buf + size, 0, 3); // certificate of clove
size += 3;
}
else
LogPrint (eLogError, "Garlic: No inbound tunnels in the pool for DeliveryStatus");
}
else
LogPrint (eLogWarning, "Garlic: Missing local LeaseSet");
return size;
}
LeaseSet::LeaseSet (std::shared_ptr<const i2p::tunnel::TunnelPool> pool):
m_IsValid (true)
{
if (!pool) return;
// header
auto localDestination = pool->GetLocalDestination ();
if (!localDestination)
{
m_Buffer = nullptr;
m_BufferLen = 0;
m_IsValid = false;
LogPrint (eLogError, "LeaseSet: Destination for local LeaseSet doesn't exist");
return;
}
m_Buffer = new uint8_t[MAX_LS_BUFFER_SIZE];
m_BufferLen = localDestination->GetIdentity ()->ToBuffer (m_Buffer, MAX_LS_BUFFER_SIZE);
memcpy (m_Buffer + m_BufferLen, localDestination->GetEncryptionPublicKey (), 256);
m_BufferLen += 256;
auto signingKeyLen = localDestination->GetIdentity ()->GetSigningPublicKeyLen ();
memset (m_Buffer + m_BufferLen, 0, signingKeyLen);
m_BufferLen += signingKeyLen;
auto tunnels = pool->GetInboundTunnels (5); // 5 tunnels maximum
m_Buffer[m_BufferLen] = tunnels.size (); // num leases
m_BufferLen++;
// leases
for (auto it: tunnels)
{
memcpy (m_Buffer + m_BufferLen, it->GetNextIdentHash (), 32);
m_BufferLen += 32; // gateway id
htobe32buf (m_Buffer + m_BufferLen, it->GetNextTunnelID ());
m_BufferLen += 4; // tunnel id
uint64_t ts = it->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // 1 minute before expiration
ts *= 1000; // in milliseconds
ts += rand () % 6; // + random milliseconds 0-5
htobe64buf (m_Buffer + m_BufferLen, ts);
m_BufferLen += 8; // end date
}
// signature
localDestination->Sign (m_Buffer, m_BufferLen, m_Buffer + m_BufferLen);
m_BufferLen += localDestination->GetIdentity ()->GetSignatureLen ();
LogPrint (eLogDebug, "LeaseSet: Local LeaseSet of ", tunnels.size (), " leases created");
ReadFromBuffer ();
}
size_t GarlicRoutingSession::CreateGarlicPayload (uint8_t * payload, std::shared_ptr<const I2NPMessage> msg, UnconfirmedTags * newTags)
{
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
uint32_t msgID;
RAND_bytes ((uint8_t *)&msgID, 4);
size_t size = 0;
uint8_t * numCloves = payload + size;
*numCloves = 0;
size++;
if (m_Owner)
{
// resubmit non-confirmed LeaseSet
if (m_LeaseSetUpdateStatus == eLeaseSetSubmitted && ts > m_LeaseSetSubmissionTime + LEASET_CONFIRMATION_TIMEOUT)
{
m_LeaseSetUpdateStatus = eLeaseSetUpdated;
SetSharedRoutingPath (nullptr); // invalidate path since leaseset was not confirmed
}
// attach DeviveryStatus if necessary
if (newTags || m_LeaseSetUpdateStatus == eLeaseSetUpdated) // new tags created or leaseset updated
{
// clove is DeliveryStatus
auto cloveSize = CreateDeliveryStatusClove (payload + size, msgID);
if (cloveSize > 0) // successive?
{
size += cloveSize;
(*numCloves)++;
if (newTags) // new tags created
{
newTags->msgID = msgID;
m_UnconfirmedTagsMsgs.insert (std::make_pair(msgID, std::unique_ptr<UnconfirmedTags>(newTags)));
newTags = nullptr; // got acquired
}
m_Owner->DeliveryStatusSent (shared_from_this (), msgID);
}
else
LogPrint (eLogWarning, "Garlic: DeliveryStatus clove was not created");
}
// attach LeaseSet
if (m_LeaseSetUpdateStatus == eLeaseSetUpdated)
{
if (m_LeaseSetUpdateMsgID) m_Owner->RemoveDeliveryStatusSession (m_LeaseSetUpdateMsgID); // remove previous
m_LeaseSetUpdateStatus = eLeaseSetSubmitted;
m_LeaseSetUpdateMsgID = msgID;
m_LeaseSetSubmissionTime = ts;
// clove if our leaseSet must be attached
auto leaseSet = CreateDatabaseStoreMsg (m_Owner->GetLeaseSet ());
size += CreateGarlicClove (payload + size, leaseSet, false);
(*numCloves)++;
}
}
if (msg) // clove message ifself if presented
{
size += CreateGarlicClove (payload + size, msg, m_Destination ? m_Destination->IsDestination () : false);
(*numCloves)++;
}
memset (payload + size, 0, 3); // certificate of message
size += 3;
htobe32buf (payload + size, msgID); // MessageID
size += 4;
htobe64buf (payload + size, ts + 8000); // Expiration of message, 8 sec
size += 8;
if (newTags) delete newTags; // not acquired, delete
return size;
}