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i2pd
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send OutboundTunnelBuildReply

pull/1661/head
orignal 4 years ago
parent
8e4781b0f7
commit
3b051dbba3
3 changed files with 83 additions and 42 deletions
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  1. 112
      libi2pd/I2NPProtocol.cpp
  2. 7
      libi2pd/I2NPProtocol.h
  3. 6
      libi2pd/TunnelConfig.cpp

112
libi2pd/I2NPProtocol.cpp
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@ -1,5 +1,5 @@ @@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2020, The PurpleI2P Project
* Copyright (c) 2013-2021, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
@ -18,6 +18,7 @@ @@ -18,6 +18,7 @@
#include "Tunnel.h"
#include "Transports.h"
#include "Garlic.h"
#include "ECIESX25519AEADRatchetSession.h"
#include "I2NPProtocol.h"
#include "version.h"
@ -387,16 +388,16 @@ namespace i2p @@ -387,16 +388,16 @@ namespace i2p
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x80,
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) :
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG) :
i2p::tunnel::CreateTransitTunnel (
bufbe32toh (clearText + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
clearText + BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
clearText + BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x80,
clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40);
clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
}
else
@ -486,7 +487,7 @@ namespace i2p @@ -486,7 +487,7 @@ namespace i2p
uint8_t clearText[ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (num, buf + 1, clearText))
{
if (clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outboud tunnel
if (clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG) // we are endpoint of outboud tunnel
{
// so we send it to reply tunnel
transports.SendMessage (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
@ -505,7 +506,7 @@ namespace i2p @@ -505,7 +506,7 @@ namespace i2p
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (num, buf + 1, clearText))
{
if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outboud tunnel
if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG) // we are endpoint of outboud tunnel
{
// so we send it to reply tunnel
transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
@ -537,7 +538,7 @@ namespace i2p @@ -537,7 +538,7 @@ namespace i2p
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (NUM_TUNNEL_BUILD_RECORDS, buf, clearText))
{
if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outbound tunnel
if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG) // we are endpoint of outbound tunnel
{
// so we send it to reply tunnel
transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
@ -610,6 +611,11 @@ namespace i2p @@ -610,6 +611,11 @@ namespace i2p
return;
}
auto& noiseState = i2p::context.GetCurrentNoiseState ();
if (!noiseState)
{
LogPrint (eLogWarning, "I2NP: Invalid Noise state for short reply encryption");
return;
}
uint8_t layerKeys[64]; // (layer key, iv key)
i2p::crypto::HKDF (noiseState->m_CK + 32, nullptr, 0, "LayerAndIVKeys", layerKeys); // TODO: correct domain
auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
@ -617,39 +623,71 @@ namespace i2p @@ -617,39 +623,71 @@ namespace i2p
clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
layerKeys, layerKeys + 32,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & 0x80,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & 0x40);
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
// TODO: fill reply
// encrypt reply
if (!noiseState)
{
LogPrint (eLogWarning, "I2NP: Invalid Noise state for short reply encryption");
return;
}
uint8_t nonce[12];
memset (nonce, 0, 12);
uint8_t * reply = buf + 1;
for (int j = 0; j < num; j++)
{
nonce[4] = j; // nonce is record #
if (j == i)
if (clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG)
{
// we are endpoint, create OutboundTunnelBuildReply
auto otbrm = NewI2NPShortMessage ();
auto payload = otbrm->GetPayload ();
payload[0] = num; // num
payload[1] = i; // slot
payload +=2;
// reply
htobe16buf (payload, 3); payload += 2; // length, TODO
memset (payload, 0, 3); payload += 3; // ClearText: no options, and zero ret code. TODO
// ShortBuildReplyRecords. Exclude ours
uint8_t * records = buf + 1;
if (i > 0)
{
memcpy (payload, records, i*SHORT_TUNNEL_BUILD_RECORD_SIZE);
payload += i*SHORT_TUNNEL_BUILD_RECORD_SIZE;
records += i*SHORT_TUNNEL_BUILD_RECORD_SIZE;
}
if (i < num-1)
{
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState->m_H, 32, noiseState->m_CK, nonce, reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
memcpy (payload, records, (num-1-i)*SHORT_TUNNEL_BUILD_RECORD_SIZE);
payload += (num-1-i)*SHORT_TUNNEL_BUILD_RECORD_SIZE;
}
otbrm->len += (payload - otbrm->GetPayload ());
otbrm->FillI2NPMessageHeader (eI2NPOutboundTunnelBuildReply, bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET));
uint8_t replyKeys[64]; // (reply key, tag)
i2p::crypto::HKDF (noiseState->m_CK, nullptr, 0, "ReplyKeyAndTag", replyKeys); // TODO: correct domain
uint64_t tag;
memcpy (&tag, replyKeys + 32, 8);
// send garlic to reply tunnel
transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateTunnelGatewayMsg (bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
i2p::garlic::WrapECIESX25519AEADRatchetMessage (otbrm, replyKeys, tag)));
}
else
{
// we are participant, encrypt reply
uint8_t nonce[12];
memset (nonce, 0, 12);
uint8_t * reply = buf + 1;
for (int j = 0; j < num; j++)
{
nonce[4] = j; // nonce is record #
if (j == i)
{
LogPrint (eLogWarning, "I2NP: Short reply AEAD encryption failed");
return;
}
// TODO: fill reply
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState->m_H, 32, noiseState->m_CK, nonce, reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
{
LogPrint (eLogWarning, "I2NP: Short reply AEAD encryption failed");
return;
}
}
else
i2p::crypto::ChaCha20 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, noiseState->m_CK, nonce, reply);
reply += SHORT_TUNNEL_BUILD_RECORD_SIZE;
}
else
i2p::crypto::ChaCha20 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, noiseState->m_CK, nonce, reply);
reply += SHORT_TUNNEL_BUILD_RECORD_SIZE;
}
// TODO: send reply
transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET,
CreateI2NPMessage (eI2NPShortTunnelBuild, buf, len,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET,
CreateI2NPMessage (eI2NPShortTunnelBuild, buf, len,
bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
return;
}
record += SHORT_TUNNEL_BUILD_RECORD_SIZE;

7
libi2pd/I2NPProtocol.h
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@ -1,5 +1,5 @@ @@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2020, The PurpleI2P Project
* Copyright (c) 2013-2021, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
@ -130,9 +130,12 @@ namespace i2p @@ -130,9 +130,12 @@ namespace i2p
eI2NPTunnelBuildReply = 22,
eI2NPVariableTunnelBuild = 23,
eI2NPVariableTunnelBuildReply = 24,
eI2NPShortTunnelBuild = 25
eI2NPShortTunnelBuild = 25,
eI2NPOutboundTunnelBuildReply = 26
};
const uint8_t TUNNEL_BUILD_RECORD_GATEWAY_FLAG = 0x80;
const uint8_t TUNNEL_BUILD_RECORD_ENDPOINT_FLAG = 0x40;
const int NUM_TUNNEL_BUILD_RECORDS = 8;
// DatabaseLookup flags

6
libi2pd/TunnelConfig.cpp
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@ -1,5 +1,5 @@ @@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2020, The PurpleI2P Project
* Copyright (c) 2013-2021, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
@ -81,8 +81,8 @@ namespace tunnel @@ -81,8 +81,8 @@ namespace tunnel
void TunnelHopConfig::CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx)
{
uint8_t flag = 0;
if (isGateway) flag |= 0x80;
if (isEndpoint) flag |= 0x40;
if (isGateway) flag |= TUNNEL_BUILD_RECORD_GATEWAY_FLAG;
if (isEndpoint) flag |= TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
auto encryptor = ident->CreateEncryptor (nullptr);
if (IsECIES ())
{

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