mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
206 lines
7.0 KiB
206 lines
7.0 KiB
#ifndef GARLIC_H__ |
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#define GARLIC_H__ |
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#include <inttypes.h> |
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#include <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 LEASET_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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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: public std::enable_shared_from_this<GarlicRoutingSession> |
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{ |
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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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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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GarlicRoutingSession (GarlicDestination * owner, std::shared_ptr<const i2p::data::RoutingDestination> destination, |
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int numTags, bool attachLeaseSet); |
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GarlicRoutingSession (const uint8_t * sessionKey, const SessionTag& sessionTag); // one time encryption |
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~GarlicRoutingSession (); |
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std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg); |
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void 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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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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std::shared_ptr<GarlicRoutingPath> GetSharedRoutingPath (); |
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void SetSharedRoutingPath (std::shared_ptr<GarlicRoutingPath> path); |
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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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GarlicDestination * m_Owner; |
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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::list<std::unique_ptr<UnconfirmedTags> > m_UnconfirmedTagsMsgs; |
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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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i2p::crypto::CBCEncryption m_Encryption; |
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std::unique_ptr<const i2p::crypto::ElGamalEncryption> m_ElGamalEncryption; |
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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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size_t GetNumOutgoingTags () const { return m_SessionTags.size (); }; |
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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 GarlicDestination: public i2p::data::LocalDestination |
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{ |
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public: |
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GarlicDestination (): m_NumTags (32) {}; // 32 tags by default |
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~GarlicDestination (); |
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void SetNumTags (int numTags) { m_NumTags = numTags; }; |
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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> WrapMessage (std::shared_ptr<const i2p::data::RoutingDestination> destination, |
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std::shared_ptr<I2NPMessage> msg, bool attachLeaseSet = false); |
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void AddSessionKey (const uint8_t * key, const uint8_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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void DeliveryStatusSent (GarlicRoutingSessionPtr session, uint32_t msgID); |
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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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virtual void HandleI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from) = 0; |
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protected: |
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void HandleGarlicMessage (std::shared_ptr<I2NPMessage> msg); |
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void HandleDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg); |
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private: |
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void HandleAESBlock (uint8_t * buf, size_t len, std::shared_ptr<i2p::crypto::CBCDecryption> 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::map<i2p::data::IdentHash, GarlicRoutingSessionPtr> m_Sessions; |
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// incoming |
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std::map<SessionTag, std::shared_ptr<i2p::crypto::CBCDecryption>> m_Tags; |
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// DeliveryStatus |
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std::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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const decltype(m_Sessions)& GetSessions () const { return m_Sessions; }; |
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}; |
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} |
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} |
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#endif
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