mirror of
https://github.com/PurpleI2P/i2pd.git
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306 lines
10 KiB
C++
306 lines
10 KiB
C++
/*
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* Copyright (c) 2013-2020, 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 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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// 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 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 RatchetTagSet;
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typedef std::shared_ptr<RatchetTagSet> RatchetTagSetPtr;
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struct ECIESX25519AEADRatchetIndexTagset
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{
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int index;
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RatchetTagSetPtr tagset;
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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> 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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void AddECIESx25519Key (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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void AddECIESx25519SessionNextTag (RatchetTagSetPtr 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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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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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) = 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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BN_CTX * m_Ctx; // incoming
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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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// 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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// 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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