I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2021, 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
*/
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#ifndef TUNNEL_CONFIG_H__
#define TUNNEL_CONFIG_H__
#include <vector>
#include "Identity.h"
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#include "RouterContext.h"
#include "Crypto.h"
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namespace i2p
{
namespace tunnel
{
struct TunnelHopConfig
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{
std::shared_ptr<const i2p::data::IdentityEx> ident;
i2p::data::IdentHash nextIdent;
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uint32_t tunnelID, nextTunnelID;
uint8_t layerKey[32];
uint8_t ivKey[32];
uint8_t replyKey[32];
uint8_t replyIV[16];
bool isGateway, isEndpoint;
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TunnelHopConfig * next, * prev;
int recordIndex; // record # in tunnel build message
TunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r);
virtual ~TunnelHopConfig () {};
void SetNextIdent (const i2p::data::IdentHash& ident);
void SetReplyHop (uint32_t replyTunnelID, const i2p::data::IdentHash& replyIdent);
void SetNext (TunnelHopConfig * n);
void SetPrev (TunnelHopConfig * p);
virtual uint8_t GetRetCode (const uint8_t * records) const = 0;
virtual void CreateBuildRequestRecord (uint8_t * records, uint32_t replyMsgID) = 0;
virtual bool DecryptBuildResponseRecord (uint8_t * records) const = 0;
virtual void DecryptRecord (uint8_t * records, int index) const; // AES
virtual uint64_t GetGarlicKey (uint8_t * key) const { return 0; }; // return tag
};
struct ECIESTunnelHopConfig: public TunnelHopConfig, public i2p::crypto::NoiseSymmetricState
{
ECIESTunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r):
TunnelHopConfig (r) {};
void EncryptECIES (const uint8_t * clearText, size_t len, uint8_t * encrypted);
bool DecryptECIES (const uint8_t * key, const uint8_t * nonce, const uint8_t * encrypted, size_t len, uint8_t * clearText) const;
};
struct LongECIESTunnelHopConfig: public ECIESTunnelHopConfig
{
LongECIESTunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r):
ECIESTunnelHopConfig (r) {};
uint8_t GetRetCode (const uint8_t * records) const override
{ return (records + recordIndex*TUNNEL_BUILD_RECORD_SIZE)[ECIES_BUILD_RESPONSE_RECORD_RET_OFFSET]; };
void CreateBuildRequestRecord (uint8_t * records, uint32_t replyMsgID) override;
bool DecryptBuildResponseRecord (uint8_t * records) const override;
};
struct ShortECIESTunnelHopConfig: public ECIESTunnelHopConfig
{
ShortECIESTunnelHopConfig (std::shared_ptr<const i2p::data::IdentityEx> r):
ECIESTunnelHopConfig (r) {};
uint8_t GetRetCode (const uint8_t * records) const override
{ return (records + recordIndex*SHORT_TUNNEL_BUILD_RECORD_SIZE)[SHORT_RESPONSE_RECORD_RET_OFFSET]; };
void CreateBuildRequestRecord (uint8_t * records, uint32_t replyMsgID) override;
bool DecryptBuildResponseRecord (uint8_t * records) const override;
void DecryptRecord (uint8_t * records, int index) const override; // Chacha20
uint64_t GetGarlicKey (uint8_t * key) const override;
};
class TunnelConfig
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{
public:
TunnelConfig (const std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers,
bool isShort, i2p::data::RouterInfo::CompatibleTransports farEndTransports = 0): // inbound
m_IsShort (isShort), m_FarEndTransports (farEndTransports)
{
CreatePeers (peers);
m_LastHop->SetNextIdent (i2p::context.GetIdentHash ());
}
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TunnelConfig (const std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers,
uint32_t replyTunnelID, const i2p::data::IdentHash& replyIdent, bool isShort,
i2p::data::RouterInfo::CompatibleTransports farEndTransports = 0): // outbound
m_IsShort (isShort), m_FarEndTransports (farEndTransports)
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{
CreatePeers (peers);
m_FirstHop->isGateway = false;
m_LastHop->SetReplyHop (replyTunnelID, replyIdent);
}
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~TunnelConfig ()
{
TunnelHopConfig * hop = m_FirstHop;
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while (hop)
{
auto tmp = hop;
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hop = hop->next;
delete tmp;
}
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}
bool IsShort () const { return m_IsShort; }
i2p::data::RouterInfo::CompatibleTransports GetFarEndTransports () const
{
return m_FarEndTransports;
}
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TunnelHopConfig * GetFirstHop () const
{
return m_FirstHop;
}
TunnelHopConfig * GetLastHop () const
{
return m_LastHop;
}
int GetNumHops () const
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{
int num = 0;
TunnelHopConfig * hop = m_FirstHop;
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while (hop)
{
num++;
hop = hop->next;
}
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return num;
}
bool IsEmpty () const
{
return !m_FirstHop;
}
virtual bool IsInbound () const { return m_FirstHop->isGateway; }
virtual uint32_t GetTunnelID () const
{
if (!m_FirstHop) return 0;
return IsInbound () ? m_LastHop->nextTunnelID : m_FirstHop->tunnelID;
}
virtual uint32_t GetNextTunnelID () const
{
if (!m_FirstHop) return 0;
return m_FirstHop->tunnelID;
}
virtual const i2p::data::IdentHash& GetNextIdentHash () const
{
return m_FirstHop->ident->GetIdentHash ();
}
virtual const i2p::data::IdentHash& GetLastIdentHash () const
{
return m_LastHop->ident->GetIdentHash ();
}
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > GetPeers () const
{
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > peers;
TunnelHopConfig * hop = m_FirstHop;
while (hop)
{
peers.push_back (hop->ident);
hop = hop->next;
}
return peers;
}
protected:
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// this constructor can't be called from outside
TunnelConfig (): m_FirstHop (nullptr), m_LastHop (nullptr), m_IsShort (false),
m_FarEndTransports (0)
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{
}
private:
void CreatePeers (const std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers);
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private:
TunnelHopConfig * m_FirstHop, * m_LastHop;
bool m_IsShort;
i2p::data::RouterInfo::CompatibleTransports m_FarEndTransports;
};
class ZeroHopsTunnelConfig: public TunnelConfig
{
public:
ZeroHopsTunnelConfig () { RAND_bytes ((uint8_t *)&m_TunnelID, 4);};
bool IsInbound () const { return true; }; // TODO:
uint32_t GetTunnelID () const { return m_TunnelID; };
uint32_t GetNextTunnelID () const { return m_TunnelID; };
const i2p::data::IdentHash& GetNextIdentHash () const { return i2p::context.GetIdentHash (); };
const i2p::data::IdentHash& GetLastIdentHash () const { return i2p::context.GetIdentHash (); };
private:
uint32_t m_TunnelID;
};
}
}
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#endif