mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
308 lines
11 KiB
308 lines
11 KiB
/* |
|
* Copyright (c) 2013-2020, The PurpleI2P Project |
|
* |
|
* This file is part of Purple i2pd project and licensed under BSD3 |
|
* |
|
* See full license text in LICENSE file at top of project tree |
|
*/ |
|
|
|
#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; }; |
|
virtual bool IsReadyToSend () const { return true; }; |
|
virtual bool IsTerminated () const { return !GetOwner (); }; |
|
virtual uint64_t GetLastActivityTimestamp () const { return 0; }; // non-zero for rathets only |
|
|
|
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 ReceiveRatchetTagSet; |
|
typedef std::shared_ptr<ReceiveRatchetTagSet> ReceiveRatchetTagSetPtr; |
|
struct ECIESX25519AEADRatchetIndexTagset |
|
{ |
|
int index; |
|
ReceiveRatchetTagSetPtr tagset; |
|
}; |
|
|
|
class GarlicDestination: public i2p::data::LocalDestination |
|
{ |
|
public: |
|
|
|
GarlicDestination (); |
|
~GarlicDestination (); |
|
|
|
void CleanUp (); |
|
void SetNumTags (int numTags) { m_NumTags = numTags; }; |
|
int GetNumTags () const { return m_NumTags; }; |
|
void SetNumRatchetInboundTags (int numTags) { m_NumRatchetInboundTags = numTags; }; |
|
int GetNumRatchetInboundTags () const { return m_NumRatchetInboundTags; }; |
|
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> WrapMessageForRouter (std::shared_ptr<const i2p::data::RouterInfo> router, |
|
std::shared_ptr<I2NPMessage> msg); |
|
|
|
void AddSessionKey (const uint8_t * key, const uint8_t * tag); // one tag |
|
void AddECIESx25519Key (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); |
|
uint64_t AddECIESx25519SessionNextTag (ReceiveRatchetTagSetPtr 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 |
|
int m_NumRatchetInboundTags; |
|
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 |
|
ReceiveRatchetTagSetPtr m_LastTagset; // tagset last message came for |
|
// 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
|
|
|