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send SessionCreated message

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orignal 2014-01-30 14:03:11 -05:00
parent aa1f58d81a
commit 732b17a368
2 changed files with 38 additions and 6 deletions
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38
SSU.cpp
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@ -63,7 +63,8 @@ namespace ssu
{
m_State = eSessionStateRequestReceived;
LogPrint ("Session request received");
SendSessionCreated (senderEndpoint);
m_RemoteEndpoint = senderEndpoint;
SendSessionCreated (buf + sizeof (SSUHeader));
}
}
@ -102,7 +103,7 @@ namespace ssu
m_Server->Send (buf, 304, m_RemoteEndpoint);
}
void SSUSession::SendSessionCreated (const boost::asio::ip::udp::endpoint& senderEndpoint)
void SSUSession::SendSessionCreated (const uint8_t * x)
{
auto address = m_RemoteRouter ? m_RemoteRouter->GetSSUAddress () : nullptr;
if (!address)
@ -110,11 +111,40 @@ namespace ssu
LogPrint ("Missing remote SSU address");
return;
}
uint8_t signedData[532]; // x,y, remote IP, remote port, our IP, our port, relayTag, signed on time
memcpy (signedData, x, 256); // x
uint8_t buf[368 + 18];
uint8_t buf[368 + 18];
uint8_t * payload = buf + sizeof (SSUHeader);
memcpy (payload, i2p::context.GetRouterIdentity ().publicKey, 256);
memcpy (signedData + 256, payload, 256); // y
payload += 256;
*payload = 4; // we assume ipv4
payload++;
*(uint32_t *)(payload) = m_RemoteEndpoint.address ().to_v4 ().to_ulong (); // network bytes order already
payload += 4;
*(uint16_t *)(payload) = htobe16 (m_RemoteEndpoint.port ());
payload += 2;
memcpy (signedData + 512, payload - 6, 6); // remote endpoint IP and port
*(uint32_t *)(signedData + 518) = m_Server->GetEndpoint ().address ().to_v4 ().to_ulong (); // our IP
*(uint16_t *)(signedData + 522) = htobe16 (m_Server->GetEndpoint ().port ()); // our port
*(uint32_t *)(payload) = 0; // relay tag, always 0 for now
payload += 4;
*(uint32_t *)(payload) = htobe32 (i2p::util::GetSecondsSinceEpoch ()); // signed on time
payload += 4;
memcpy (signedData + 524, payload - 8, 8); // relayTag and signed on time
i2p::context.Sign (signedData, 532, payload); // DSA signature
// TODO: fill padding with random data
uint8_t iv[16];
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (iv, 16); // random iv
// encrypt signature and 8 bytes padding with newly created session key
m_Encryption.SetKeyWithIV (m_SessionKey, 32, iv);
m_Encryption.ProcessData (payload, payload, 48);
// encrypt message with intro key
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_CREATED, buf, 368, address->key, iv, address->key);
m_State = eSessionStateRequestSent;
m_Server->Send (buf, 368, m_RemoteEndpoint);
}
@ -209,7 +239,7 @@ namespace ssu
}
SSUServer::SSUServer (boost::asio::io_service& service, int port):
m_Socket (service, boost::asio::ip::udp::endpoint (boost::asio::ip::udp::v4 (), port))
m_Endpoint (boost::asio::ip::udp::v4 (), port), m_Socket (service, m_Endpoint)
{
}

6
SSU.h
View file

@ -68,7 +68,7 @@ namespace ssu
void ProcessSessionRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
void SendSessionRequest ();
void ProcessSessionCreated (uint8_t * buf, size_t len);
void SendSessionCreated (const boost::asio::ip::udp::endpoint& senderEndpoint);
void SendSessionCreated (const uint8_t * x);
bool ProcessIntroKeyEncryptedMessage (uint8_t expectedPayloadType, uint8_t * buf, size_t len);
void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, uint8_t * aesKey, uint8_t * iv, uint8_t * macKey);
@ -95,7 +95,8 @@ namespace ssu
void Start ();
void Stop ();
SSUSession * GetSession (i2p::data::RouterInfo * router);
const boost::asio::ip::udp::endpoint& GetEndpoint () const { return m_Endpoint; };
void Send (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& to);
private:
@ -105,6 +106,7 @@ namespace ssu
private:
boost::asio::ip::udp::endpoint m_Endpoint;
boost::asio::ip::udp::socket m_Socket;
boost::asio::ip::udp::endpoint m_SenderEndpoint;
uint8_t m_ReceiveBuffer[2*SSU_MTU];