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session to introducer

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orignal 2014-09-05 16:35:02 -04:00
parent 4a39dd4818
commit 9500d96789
2 changed files with 95 additions and 19 deletions
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89
SSU.cpp
View File

@ -18,8 +18,8 @@ namespace ssu
SSUSession::SSUSession (SSUServer& server, boost::asio::ip::udp::endpoint& remoteEndpoint,
const i2p::data::RouterInfo * router, bool peerTest ):
m_Server (server), m_RemoteEndpoint (remoteEndpoint), m_RemoteRouter (router),
m_Timer (m_Server.GetService ()), m_PeerTest (peerTest), m_State (eSessionStateUnknown),
m_IsSessionKey (false), m_RelayTag (0), m_Data (*this),
m_Timer (m_Server.GetService ()), m_PeerTest (peerTest), m_ToIntroducer (false),
m_State (eSessionStateUnknown), m_IsSessionKey (false), m_RelayTag (0), m_Data (*this),
m_NumSentBytes (0), m_NumReceivedBytes (0)
{
m_DHKeysPair = i2p::transports.GetNextDHKeysPair ();
@ -87,10 +87,10 @@ namespace ssu
}
else
{
if (m_State == eSessionStateEstablished)
if (!len) return; // ignore zero-length packets
if (m_State == eSessionStateEstablished && !m_ToIntroducer)
ScheduleTermination ();
if (!len) return; // ignore zero-length packets
if (m_IsSessionKey && Validate (buf, len, m_MacKey)) // try session key first
DecryptSessionKey (buf, len);
else
@ -416,10 +416,8 @@ namespace ssu
payload += 2; // port
*(uint32_t *)payload = htobe32 (nonce);
uint8_t iv[16];
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (iv, 16); // random iv
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_RESPONSE, buf, 64, m_SessionKey, iv, m_MacKey);
// encrypt with session key
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_RESPONSE, buf, 64);
Send (buf, 64);
}
@ -673,6 +671,21 @@ namespace ssu
}
}
void SSUSession::ScheduleKeepAlive ()
{
m_Timer.cancel ();
m_Timer.expires_from_now (boost::posix_time::seconds(SSU_KEEP_ALIVE_INETRVAL));
m_Timer.async_wait (boost::bind (&SSUSession::HandleKeepAliveTimer,
this, boost::asio::placeholders::error));
}
void SSUSession::HandleKeepAliveTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
SendKeepAlive ();
}
const uint8_t * SSUSession::GetIntroKey () const
{
if (m_RemoteRouter)
@ -765,7 +778,7 @@ namespace ssu
else
{
LogPrint ("SSU peer test from Alice. We are Bob");
auto session = m_Server.GetRandomEstablishedSession (); // charlie
auto session = m_Server.GetRandomEstablishedSession (this); // charlie
if (session)
session->SendPeerTest (nonce, senderEndpoint.address ().to_v4 ().to_ulong (),
senderEndpoint.port (), introKey, false);
@ -821,6 +834,18 @@ namespace ssu
SendPeerTest (nonce, 0, 0, address->key, false); // address and port always zero for Alice
}
void SSUSession::SendKeepAlive ()
{
uint8_t buf[48 + 18];
uint8_t * payload = buf + sizeof (SSUHeader);
*payload = 0; // flags
payload++;
*payload = 0; // num fragments
// encrypt message with session key
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_DESTROYED, buf, 48);
Send (buf, 48);
LogPrint ("SSU keep-alive sent");
}
void SSUSession::SendSesionDestroyed ()
{
@ -855,6 +880,24 @@ namespace ssu
m_Server.Send (buf, size, m_RemoteEndpoint);
}
void SSUSession::StartToIntroducer ()
{
if (m_State == eSessionStateEstablished)
{
m_ToIntroducer = true;
ScheduleKeepAlive ();
}
}
void SSUSession::StopToIntroducer ()
{
if (m_State == eSessionStateEstablished)
{
m_ToIntroducer = false;
ScheduleTermination ();
}
}
SSUServer::SSUServer (int port): m_Thread (nullptr), m_Work (m_Service),
m_Endpoint (boost::asio::ip::udp::v4 (), port), m_Socket (m_Service, m_Endpoint)
{
@ -1077,15 +1120,37 @@ namespace ssu
return nullptr;
}
SSUSession * SSUServer::GetRandomEstablishedSession ()
SSUSession * SSUServer::GetRandomEstablishedSession (const SSUSession * excluded)
{
return GetRandomSession (
[](SSUSession * session)->bool
[excluded](SSUSession * session)->bool
{
return session->GetState () == eSessionStateEstablished;
return session->GetState () == eSessionStateEstablished &&
session != excluded;
}
);
}
std::set<SSUSession *> SSUServer::GetIntroducers (int maxNumIntroducers)
{
std::set<SSUSession *> ret;
for (int i = 0; i < maxNumIntroducers; i++)
{
auto session = GetRandomSession (
[&ret](SSUSession * session)->bool
{
return session->GetRelayTag () && !ret.count (session) &&
session->GetState () == eSessionStateEstablished;
}
);
if (session)
{
ret.insert (session);
break;
}
}
return ret;
}
}
}

15
SSU.h
View File

@ -33,6 +33,8 @@ namespace ssu
const int SSU_CONNECT_TIMEOUT = 5; // 5 seconds
const int SSU_TERMINATION_TIMEOUT = 330; // 5.5 minutes
const int SSU_KEEP_ALIVE_INETRVAL = 30; // 30 seconds
const int SSU_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour
// payload types (4 bits)
const uint8_t PAYLOAD_TYPE_SESSION_REQUEST = 0;
@ -76,6 +78,9 @@ namespace ssu
size_t GetNumSentBytes () const { return m_NumSentBytes; };
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
void StartToIntroducer ();
void StopToIntroducer ();
uint32_t GetRelayTag () const { return m_RelayTag; };
private:
@ -103,6 +108,7 @@ namespace ssu
void SendPeerTest (uint32_t nonce, uint32_t address, uint16_t port, const uint8_t * introKey, bool toAddress = true);
void ProcessData (uint8_t * buf, size_t len);
void SendSesionDestroyed ();
void SendKeepAlive ();
void Send (uint8_t type, const uint8_t * payload, size_t len); // with session key
void Send (const uint8_t * buf, size_t size);
@ -116,6 +122,9 @@ namespace ssu
void ScheduleTermination ();
void HandleTerminationTimer (const boost::system::error_code& ecode);
void ScheduleKeepAlive ();
void HandleKeepAliveTimer (const boost::system::error_code& ecode);
private:
friend class SSUData; // TODO: change in later
@ -124,7 +133,7 @@ namespace ssu
const i2p::data::RouterInfo * m_RemoteRouter;
boost::asio::deadline_timer m_Timer;
i2p::data::DHKeysPair * m_DHKeysPair; // X - for client and Y - for server
bool m_PeerTest;
bool m_PeerTest, m_ToIntroducer;
SessionState m_State;
bool m_IsSessionKey;
uint32_t m_RelayTag;
@ -148,7 +157,7 @@ namespace ssu
SSUSession * GetSession (const i2p::data::RouterInfo * router, bool peerTest = false);
SSUSession * FindSession (const i2p::data::RouterInfo * router);
SSUSession * FindSession (const boost::asio::ip::udp::endpoint& e);
SSUSession * GetRandomEstablishedSession ();
SSUSession * GetRandomEstablishedSession (const SSUSession * excluded);
void DeleteSession (SSUSession * session);
void DeleteAllSessions ();
@ -164,6 +173,8 @@ namespace ssu
void Receive ();
void HandleReceivedFrom (const boost::system::error_code& ecode, std::size_t bytes_transferred);
std::set<SSUSession *> GetIntroducers (int maxNumIntroducers);
template<typename Filter>
SSUSession * GetRandomSession (Filter filter);