I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef GARLIC_H__
#define GARLIC_H__
#include <inttypes.h>
#include <unordered_map>
#include <list>
#include <string>
#include <thread>
#include <mutex>
#include <memory>
#include "Crypto.h"
#include "I2NPProtocol.h"
#include "LeaseSet.h"
#include "Queue.h"
#include "Identity.h"
namespace i2p
{
namespace tunnel
{
class OutboundTunnel;
}
namespace garlic
{
enum GarlicDeliveryType
{
eGarlicDeliveryTypeLocal = 0,
eGarlicDeliveryTypeDestination = 1,
eGarlicDeliveryTypeRouter = 2,
eGarlicDeliveryTypeTunnel = 3
};
struct ElGamalBlock
{
uint8_t sessionKey[32];
uint8_t preIV[32];
uint8_t padding[158];
};
const int INCOMING_TAGS_EXPIRATION_TIMEOUT = 960; // 16 minutes
const int OUTGOING_TAGS_EXPIRATION_TIMEOUT = 720; // 12 minutes
const int OUTGOING_TAGS_CONFIRMATION_TIMEOUT = 10; // 10 seconds
const int LEASET_CONFIRMATION_TIMEOUT = 4000; // in milliseconds
const int ROUTING_PATH_EXPIRATION_TIMEOUT = 30; // 30 seconds
const int ROUTING_PATH_MAX_NUM_TIMES_USED = 100; // how many times might be used
struct SessionTag: public i2p::data::Tag<32>
{
SessionTag (const uint8_t * buf, uint32_t ts = 0): Tag<32>(buf), creationTime (ts) {};
SessionTag () = default;
SessionTag (const SessionTag& ) = default;
SessionTag& operator= (const SessionTag& ) = default;
#ifndef _WIN32
SessionTag (SessionTag&& ) = default;
SessionTag& operator= (SessionTag&& ) = default;
#endif
uint32_t creationTime; // seconds since epoch
};
// AESDecryption is associated with session tags and store key
class AESDecryption: public i2p::crypto::CBCDecryption
{
public:
AESDecryption (const uint8_t * key): m_Key (key)
{
SetKey (key);
}
const i2p::crypto::AESKey& GetKey () const { return m_Key; };
private:
i2p::crypto::AESKey m_Key;
};
struct GarlicRoutingPath
{
std::shared_ptr<i2p::tunnel::OutboundTunnel> outboundTunnel;
std::shared_ptr<const i2p::data::Lease> remoteLease;
int rtt; // RTT
uint32_t updateTime; // seconds since epoch
int numTimesUsed;
};
class GarlicDestination;
class GarlicRoutingSession
{
protected:
enum LeaseSetUpdateStatus
{
eLeaseSetUpToDate = 0,
eLeaseSetUpdated,
eLeaseSetSubmitted,
eLeaseSetDoNotSend
};
public:
GarlicRoutingSession (GarlicDestination * owner, bool attachLeaseSet);
GarlicRoutingSession ();
virtual ~GarlicRoutingSession ();
virtual std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) = 0;
virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession
virtual bool MessageConfirmed (uint32_t msgID);
virtual bool IsRatchets () const { return false; };
void SetLeaseSetUpdated ()
{
if (m_LeaseSetUpdateStatus != eLeaseSetDoNotSend) m_LeaseSetUpdateStatus = eLeaseSetUpdated;
};
bool IsLeaseSetNonConfirmed () const { return m_LeaseSetUpdateStatus == eLeaseSetSubmitted; };
bool IsLeaseSetUpdated () const { return m_LeaseSetUpdateStatus == eLeaseSetUpdated; };
uint64_t GetLeaseSetSubmissionTime () const { return m_LeaseSetSubmissionTime; }
void CleanupUnconfirmedLeaseSet (uint64_t ts);
std::shared_ptr<GarlicRoutingPath> GetSharedRoutingPath ();
void SetSharedRoutingPath (std::shared_ptr<GarlicRoutingPath> path);
GarlicDestination * GetOwner () const { return m_Owner; }
void SetOwner (GarlicDestination * owner) { m_Owner = owner; }
protected:
LeaseSetUpdateStatus GetLeaseSetUpdateStatus () const { return m_LeaseSetUpdateStatus; }
void SetLeaseSetUpdateStatus (LeaseSetUpdateStatus status) { m_LeaseSetUpdateStatus = status; }
uint32_t GetLeaseSetUpdateMsgID () const { return m_LeaseSetUpdateMsgID; }
void SetLeaseSetUpdateMsgID (uint32_t msgID) { m_LeaseSetUpdateMsgID = msgID; }
void SetLeaseSetSubmissionTime (uint64_t ts) { m_LeaseSetSubmissionTime = ts; }
std::shared_ptr<I2NPMessage> CreateEncryptedDeliveryStatusMsg (uint32_t msgID);
private:
GarlicDestination * m_Owner;
LeaseSetUpdateStatus m_LeaseSetUpdateStatus;
uint32_t m_LeaseSetUpdateMsgID;
uint64_t m_LeaseSetSubmissionTime; // in milliseconds
std::shared_ptr<GarlicRoutingPath> m_SharedRoutingPath;
public:
// for HTTP only
virtual size_t GetNumOutgoingTags () const { return 0; };
};
//using GarlicRoutingSessionPtr = std::shared_ptr<GarlicRoutingSession>;
typedef std::shared_ptr<GarlicRoutingSession> GarlicRoutingSessionPtr; // TODO: replace to using after switch to 4.8
class ElGamalAESSession: public GarlicRoutingSession, public std::enable_shared_from_this<ElGamalAESSession>
{
struct UnconfirmedTags
{
UnconfirmedTags (int n): numTags (n), tagsCreationTime (0) { sessionTags = new SessionTag[numTags]; };
~UnconfirmedTags () { delete[] sessionTags; };
uint32_t msgID;
int numTags;
SessionTag * sessionTags;
uint32_t tagsCreationTime;
};
public:
ElGamalAESSession (GarlicDestination * owner, std::shared_ptr<const i2p::data::RoutingDestination> destination,
int numTags, bool attachLeaseSet);
ElGamalAESSession (const uint8_t * sessionKey, const SessionTag& sessionTag); // one time encryption
~ElGamalAESSession () {};
std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg);
bool MessageConfirmed (uint32_t msgID);
bool CleanupExpiredTags (); // returns true if something left
bool CleanupUnconfirmedTags (); // returns true if something has been deleted
private:
size_t CreateAESBlock (uint8_t * buf, std::shared_ptr<const I2NPMessage> msg);
size_t CreateGarlicPayload (uint8_t * payload, std::shared_ptr<const I2NPMessage> msg, UnconfirmedTags * newTags);
size_t CreateGarlicClove (uint8_t * buf, std::shared_ptr<const I2NPMessage> msg, bool isDestination);
size_t CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID);
void TagsConfirmed (uint32_t msgID);
UnconfirmedTags * GenerateSessionTags ();
private:
std::shared_ptr<const i2p::data::RoutingDestination> m_Destination;
i2p::crypto::AESKey m_SessionKey;
std::list<SessionTag> m_SessionTags;
int m_NumTags;
std::map<uint32_t, std::unique_ptr<UnconfirmedTags> > m_UnconfirmedTagsMsgs; // msgID->tags
i2p::crypto::CBCEncryption m_Encryption;
public:
// for HTTP only
size_t GetNumOutgoingTags () const { return m_SessionTags.size (); };
};
typedef std::shared_ptr<ElGamalAESSession> ElGamalAESSessionPtr;
class ECIESX25519AEADRatchetSession;
typedef std::shared_ptr<ECIESX25519AEADRatchetSession> ECIESX25519AEADRatchetSessionPtr;
class RatchetTagSet;
typedef std::shared_ptr<RatchetTagSet> RatchetTagSetPtr;
struct ECIESX25519AEADRatchetIndexTagset
{
int index;
RatchetTagSetPtr tagset;
uint64_t creationTime; // seconds since epoch
};
class GarlicDestination: public i2p::data::LocalDestination
{
public:
GarlicDestination ();
~GarlicDestination ();
void CleanUp ();
void SetNumTags (int numTags) { m_NumTags = numTags; };
int GetNumTags () const { return m_NumTags; };
std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet);
void CleanupExpiredTags ();
void RemoveDeliveryStatusSession (uint32_t msgID);
std::shared_ptr<I2NPMessage> WrapMessage (std::shared_ptr<const i2p::data::RoutingDestination> destination,
std::shared_ptr<I2NPMessage> msg, bool attachLeaseSet = false);
void AddSessionKey (const uint8_t * key, const uint8_t * tag); // one tag
virtual bool SubmitSessionKey (const uint8_t * key, const uint8_t * tag); // from different thread
void DeliveryStatusSent (GarlicRoutingSessionPtr session, uint32_t msgID);
void AddECIESx25519SessionNextTag (RatchetTagSetPtr tagset);
void AddECIESx25519Session (const uint8_t * staticKey, ECIESX25519AEADRatchetSessionPtr session);
void RemoveECIESx25519Session (const uint8_t * staticKey);
void HandleECIESx25519GarlicClove (const uint8_t * buf, size_t len);
virtual void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
virtual void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);
virtual void SetLeaseSetUpdated ();
virtual std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () = 0; // TODO
virtual std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const = 0;
protected:
virtual void HandleI2NPMessage (const uint8_t * buf, size_t len) = 0; // called from clove only
virtual bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len) = 0;
void HandleGarlicMessage (std::shared_ptr<I2NPMessage> msg);
void HandleDeliveryStatusMessage (uint32_t msgID);
void SaveTags ();
void LoadTags ();
private:
void HandleAESBlock (uint8_t * buf, size_t len, std::shared_ptr<AESDecryption> decryption,
std::shared_ptr<i2p::tunnel::InboundTunnel> from);
void HandleGarlicPayload (uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from);
private:
BN_CTX * m_Ctx; // incoming
// outgoing sessions
int m_NumTags;
std::mutex m_SessionsMutex;
std::unordered_map<i2p::data::IdentHash, ElGamalAESSessionPtr> m_Sessions;
std::unordered_map<i2p::data::Tag<32>, ECIESX25519AEADRatchetSessionPtr> m_ECIESx25519Sessions; // static key -> session
// incoming
std::unordered_map<SessionTag, std::shared_ptr<AESDecryption>, std::hash<i2p::data::Tag<32> > > m_Tags;
std::unordered_map<uint64_t, ECIESX25519AEADRatchetIndexTagset> m_ECIESx25519Tags; // session tag -> session
// DeliveryStatus
std::mutex m_DeliveryStatusSessionsMutex;
std::unordered_map<uint32_t, GarlicRoutingSessionPtr> m_DeliveryStatusSessions; // msgID -> session
public:
// for HTTP only
size_t GetNumIncomingTags () const { return m_Tags.size (); }
size_t GetNumIncomingECIESx25519Tags () const { return m_ECIESx25519Tags.size (); }
const decltype(m_Sessions)& GetSessions () const { return m_Sessions; };
const decltype(m_ECIESx25519Sessions)& GetECIESx25519Sessions () const { return m_ECIESx25519Sessions; }
};
void CleanUpTagsFiles ();
}
}
#endif