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I2P: End-to-End encrypted and anonymous Internet
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312 lines
11 KiB
312 lines
11 KiB
/* |
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* Copyright (c) 2013-2024, The PurpleI2P Project |
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* |
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* This file is part of Purple i2pd project and licensed under BSD3 |
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* |
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* See full license text in LICENSE file at top of project tree |
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*/ |
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#ifndef GARLIC_H__ |
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#define GARLIC_H__ |
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#include <inttypes.h> |
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#include <unordered_map> |
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#include <list> |
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#include <string> |
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#include <thread> |
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#include <mutex> |
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#include <memory> |
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#include "Crypto.h" |
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#include "I2NPProtocol.h" |
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#include "LeaseSet.h" |
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#include "Queue.h" |
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#include "Identity.h" |
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namespace i2p |
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{ |
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namespace tunnel |
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{ |
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class OutboundTunnel; |
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} |
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namespace garlic |
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{ |
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enum GarlicDeliveryType |
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{ |
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eGarlicDeliveryTypeLocal = 0, |
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eGarlicDeliveryTypeDestination = 1, |
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eGarlicDeliveryTypeRouter = 2, |
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eGarlicDeliveryTypeTunnel = 3 |
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}; |
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struct ElGamalBlock |
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{ |
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uint8_t sessionKey[32]; |
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uint8_t preIV[32]; |
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uint8_t padding[158]; |
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}; |
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const int INCOMING_TAGS_EXPIRATION_TIMEOUT = 960; // 16 minutes |
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const int OUTGOING_TAGS_EXPIRATION_TIMEOUT = 720; // 12 minutes |
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const int OUTGOING_TAGS_CONFIRMATION_TIMEOUT = 10; // 10 seconds |
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const int LEASESET_CONFIRMATION_TIMEOUT = 4000; // in milliseconds |
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const int ROUTING_PATH_EXPIRATION_TIMEOUT = 30; // 30 seconds |
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const int ROUTING_PATH_MAX_NUM_TIMES_USED = 100; // how many times might be used |
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struct SessionTag: public i2p::data::Tag<32> |
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{ |
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SessionTag (const uint8_t * buf, uint32_t ts = 0): Tag<32>(buf), creationTime (ts) {}; |
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SessionTag () = default; |
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SessionTag (const SessionTag& ) = default; |
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SessionTag& operator= (const SessionTag& ) = default; |
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#ifndef _WIN32 |
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SessionTag (SessionTag&& ) = default; |
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SessionTag& operator= (SessionTag&& ) = default; |
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#endif |
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uint32_t creationTime; // seconds since epoch |
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}; |
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// AESDecryption is associated with session tags and store key |
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class AESDecryption: public i2p::crypto::CBCDecryption |
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{ |
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public: |
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AESDecryption (const uint8_t * key): m_Key (key) |
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{ |
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SetKey (key); |
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} |
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const i2p::crypto::AESKey& GetKey () const { return m_Key; }; |
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private: |
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i2p::crypto::AESKey m_Key; |
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}; |
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struct GarlicRoutingPath |
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{ |
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std::shared_ptr<i2p::tunnel::OutboundTunnel> outboundTunnel; |
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std::shared_ptr<const i2p::data::Lease> remoteLease; |
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int rtt; // RTT |
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uint32_t updateTime; // seconds since epoch |
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int numTimesUsed; |
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}; |
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class GarlicDestination; |
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class GarlicRoutingSession |
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{ |
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protected: |
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enum LeaseSetUpdateStatus |
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{ |
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eLeaseSetUpToDate = 0, |
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eLeaseSetUpdated, |
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eLeaseSetSubmitted, |
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eLeaseSetDoNotSend |
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}; |
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public: |
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GarlicRoutingSession (GarlicDestination * owner, bool attachLeaseSet); |
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GarlicRoutingSession (); |
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virtual ~GarlicRoutingSession (); |
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virtual std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) = 0; |
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virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession |
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virtual bool MessageConfirmed (uint32_t msgID); |
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virtual bool IsRatchets () const { return false; }; |
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virtual bool IsReadyToSend () const { return true; }; |
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virtual bool IsTerminated () const { return !GetOwner (); }; |
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virtual uint64_t GetLastActivityTimestamp () const { return 0; }; // non-zero for rathets only |
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void SetLeaseSetUpdated () |
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{ |
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if (m_LeaseSetUpdateStatus != eLeaseSetDoNotSend) m_LeaseSetUpdateStatus = eLeaseSetUpdated; |
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}; |
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bool IsLeaseSetNonConfirmed () const { return m_LeaseSetUpdateStatus == eLeaseSetSubmitted; }; |
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bool IsLeaseSetUpdated () const { return m_LeaseSetUpdateStatus == eLeaseSetUpdated; }; |
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uint64_t GetLeaseSetSubmissionTime () const { return m_LeaseSetSubmissionTime; } |
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void CleanupUnconfirmedLeaseSet (uint64_t ts); |
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std::shared_ptr<GarlicRoutingPath> GetSharedRoutingPath (); |
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void SetSharedRoutingPath (std::shared_ptr<GarlicRoutingPath> path); |
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GarlicDestination * GetOwner () const { return m_Owner; } |
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void SetOwner (GarlicDestination * owner) { m_Owner = owner; } |
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protected: |
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LeaseSetUpdateStatus GetLeaseSetUpdateStatus () const { return m_LeaseSetUpdateStatus; } |
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void SetLeaseSetUpdateStatus (LeaseSetUpdateStatus status) { m_LeaseSetUpdateStatus = status; } |
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uint32_t GetLeaseSetUpdateMsgID () const { return m_LeaseSetUpdateMsgID; } |
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void SetLeaseSetUpdateMsgID (uint32_t msgID) { m_LeaseSetUpdateMsgID = msgID; } |
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void SetLeaseSetSubmissionTime (uint64_t ts) { m_LeaseSetSubmissionTime = ts; } |
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std::shared_ptr<I2NPMessage> CreateEncryptedDeliveryStatusMsg (uint32_t msgID); |
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private: |
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GarlicDestination * m_Owner; |
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LeaseSetUpdateStatus m_LeaseSetUpdateStatus; |
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uint32_t m_LeaseSetUpdateMsgID; |
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uint64_t m_LeaseSetSubmissionTime; // in milliseconds |
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std::shared_ptr<GarlicRoutingPath> m_SharedRoutingPath; |
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public: |
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// for HTTP only |
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virtual size_t GetNumOutgoingTags () const { return 0; }; |
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}; |
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//using GarlicRoutingSessionPtr = std::shared_ptr<GarlicRoutingSession>; |
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typedef std::shared_ptr<GarlicRoutingSession> GarlicRoutingSessionPtr; // TODO: replace to using after switch to 4.8 |
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class ElGamalAESSession: public GarlicRoutingSession, public std::enable_shared_from_this<ElGamalAESSession> |
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{ |
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struct UnconfirmedTags |
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{ |
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UnconfirmedTags (int n): numTags (n), tagsCreationTime (0) { sessionTags = new SessionTag[numTags]; }; |
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~UnconfirmedTags () { delete[] sessionTags; }; |
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uint32_t msgID; |
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int numTags; |
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SessionTag * sessionTags; |
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uint32_t tagsCreationTime; |
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}; |
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public: |
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ElGamalAESSession (GarlicDestination * owner, std::shared_ptr<const i2p::data::RoutingDestination> destination, |
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int numTags, bool attachLeaseSet); |
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ElGamalAESSession (const uint8_t * sessionKey, const SessionTag& sessionTag); // one time encryption |
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~ElGamalAESSession () {}; |
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std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg); |
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bool MessageConfirmed (uint32_t msgID); |
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bool CleanupExpiredTags (); // returns true if something left |
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bool CleanupUnconfirmedTags (); // returns true if something has been deleted |
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private: |
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size_t CreateAESBlock (uint8_t * buf, std::shared_ptr<const I2NPMessage> msg); |
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size_t CreateGarlicPayload (uint8_t * payload, std::shared_ptr<const I2NPMessage> msg, UnconfirmedTags * newTags); |
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size_t CreateGarlicClove (uint8_t * buf, std::shared_ptr<const I2NPMessage> msg, bool isDestination); |
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size_t CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID); |
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void TagsConfirmed (uint32_t msgID); |
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UnconfirmedTags * GenerateSessionTags (); |
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private: |
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std::shared_ptr<const i2p::data::RoutingDestination> m_Destination; |
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i2p::crypto::AESKey m_SessionKey; |
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std::list<SessionTag> m_SessionTags; |
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int m_NumTags; |
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std::map<uint32_t, std::unique_ptr<UnconfirmedTags> > m_UnconfirmedTagsMsgs; // msgID->tags |
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i2p::crypto::CBCEncryption m_Encryption; |
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public: |
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// for HTTP only |
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size_t GetNumOutgoingTags () const { return m_SessionTags.size (); }; |
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}; |
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typedef std::shared_ptr<ElGamalAESSession> ElGamalAESSessionPtr; |
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class ECIESX25519AEADRatchetSession; |
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typedef std::shared_ptr<ECIESX25519AEADRatchetSession> ECIESX25519AEADRatchetSessionPtr; |
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class ReceiveRatchetTagSet; |
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typedef std::shared_ptr<ReceiveRatchetTagSet> ReceiveRatchetTagSetPtr; |
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struct ECIESX25519AEADRatchetIndexTagset |
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{ |
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int index; |
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ReceiveRatchetTagSetPtr tagset; // null if used |
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}; |
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class GarlicDestination: public i2p::data::LocalDestination |
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{ |
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public: |
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GarlicDestination (); |
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~GarlicDestination (); |
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void CleanUp (); |
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void SetNumTags (int numTags) { m_NumTags = numTags; }; |
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int GetNumTags () const { return m_NumTags; }; |
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void SetNumRatchetInboundTags (int numTags) { m_NumRatchetInboundTags = numTags; }; |
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int GetNumRatchetInboundTags () const { return m_NumRatchetInboundTags; }; |
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std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet); |
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void CleanupExpiredTags (); |
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void RemoveDeliveryStatusSession (uint32_t msgID); |
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std::shared_ptr<I2NPMessage> WrapMessageForRouter (std::shared_ptr<const i2p::data::RouterInfo> router, |
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std::shared_ptr<I2NPMessage> msg); |
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void AddSessionKey (const uint8_t * key, const uint8_t * tag); // one tag |
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void AddECIESx25519Key (const uint8_t * key, uint64_t tag); // one tag |
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virtual bool SubmitSessionKey (const uint8_t * key, const uint8_t * tag); // from different thread |
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virtual void SubmitECIESx25519Key (const uint8_t * key, uint64_t tag); // from different thread |
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void DeliveryStatusSent (GarlicRoutingSessionPtr session, uint32_t msgID); |
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uint64_t AddECIESx25519SessionNextTag (ReceiveRatchetTagSetPtr tagset); |
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void AddECIESx25519Session (const uint8_t * staticKey, ECIESX25519AEADRatchetSessionPtr session); |
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void RemoveECIESx25519Session (const uint8_t * staticKey); |
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void HandleECIESx25519GarlicClove (const uint8_t * buf, size_t len); |
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uint8_t * GetPayloadBuffer (); |
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virtual void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg); |
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virtual void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg); |
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virtual void SetLeaseSetUpdated (); |
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virtual std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () = 0; // TODO |
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virtual std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const = 0; |
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protected: |
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void AddECIESx25519Key (const uint8_t * key, const uint8_t * tag); // one tag |
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bool HandleECIESx25519TagMessage (uint8_t * buf, size_t len); // return true if found |
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virtual void HandleI2NPMessage (const uint8_t * buf, size_t len) = 0; // called from clove only |
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virtual bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID) = 0; |
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void HandleGarlicMessage (std::shared_ptr<I2NPMessage> msg); |
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void HandleDeliveryStatusMessage (uint32_t msgID); |
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void SaveTags (); |
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void LoadTags (); |
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private: |
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void HandleAESBlock (uint8_t * buf, size_t len, std::shared_ptr<AESDecryption> decryption, |
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std::shared_ptr<i2p::tunnel::InboundTunnel> from); |
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void HandleGarlicPayload (uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from); |
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private: |
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// outgoing sessions |
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int m_NumTags; |
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std::mutex m_SessionsMutex; |
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std::unordered_map<i2p::data::IdentHash, ElGamalAESSessionPtr> m_Sessions; |
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std::unordered_map<i2p::data::Tag<32>, ECIESX25519AEADRatchetSessionPtr> m_ECIESx25519Sessions; // static key -> session |
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uint8_t * m_PayloadBuffer; // for ECIESX25519AEADRatchet |
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// incoming |
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int m_NumRatchetInboundTags; |
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std::unordered_map<SessionTag, std::shared_ptr<AESDecryption>, std::hash<i2p::data::Tag<32> > > m_Tags; |
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std::unordered_map<uint64_t, ECIESX25519AEADRatchetIndexTagset> m_ECIESx25519Tags; // session tag -> session |
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ReceiveRatchetTagSetPtr m_LastTagset; // tagset last message came for |
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// DeliveryStatus |
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std::mutex m_DeliveryStatusSessionsMutex; |
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std::unordered_map<uint32_t, GarlicRoutingSessionPtr> m_DeliveryStatusSessions; // msgID -> session |
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public: |
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// for HTTP only |
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size_t GetNumIncomingTags () const { return m_Tags.size (); } |
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size_t GetNumIncomingECIESx25519Tags () const { return m_ECIESx25519Tags.size (); } |
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const decltype(m_Sessions)& GetSessions () const { return m_Sessions; }; |
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const decltype(m_ECIESx25519Sessions)& GetECIESx25519Sessions () const { return m_ECIESx25519Sessions; } |
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}; |
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void CleanUpTagsFiles (); |
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} |
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} |
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#endif
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