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i2pd
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don't handle ElGamal build record

pull/1693/head
orignal 3 years ago
parent
a54b5c18c6
commit
76dca1b46b
2 changed files with 29 additions and 125 deletions
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  1. 129
      libi2pd/I2NPProtocol.cpp
  2. 21
      libi2pd/I2NPProtocol.h

129
libi2pd/I2NPProtocol.cpp
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@ -391,76 +391,48 @@ namespace i2p @@ -391,76 +391,48 @@ namespace i2p
LogPrint (eLogDebug, "I2NP: Build request record ", i, " is ours");
if (!i2p::context.DecryptTunnelBuildRecord (record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText)) return false;
uint8_t retCode = 0;
bool isECIES = i2p::context.IsECIES ();
// replace record to reply
if (i2p::context.AcceptsTunnels () &&
i2p::tunnel::tunnels.GetTransitTunnels ().size () <= g_MaxNumTransitTunnels &&
!i2p::transport::transports.IsBandwidthExceeded () &&
!i2p::transport::transports.IsTransitBandwidthExceeded ())
{
auto transitTunnel = isECIES ?
i2p::tunnel::CreateTransitTunnel (
auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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] & 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] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
}
else
retCode = 30; // always reject with bandwidth reason (30)
if (isECIES)
{
memset (record + ECIES_BUILD_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
record[ECIES_BUILD_RESPONSE_RECORD_RET_OFFSET] = retCode;
}
else
{
record[BUILD_RESPONSE_RECORD_RET_OFFSET] = retCode;
SHA256 (record + BUILD_RESPONSE_RECORD_PADDING_OFFSET, BUILD_RESPONSE_RECORD_PADDING_SIZE + 1, // + 1 byte of ret
record + BUILD_RESPONSE_RECORD_HASH_OFFSET);
}
memset (record + ECIES_BUILD_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
record[ECIES_BUILD_RESPONSE_RECORD_RET_OFFSET] = retCode;
// encrypt reply
i2p::crypto::CBCEncryption encryption;
for (int j = 0; j < num; j++)
{
uint8_t * reply = records + j*TUNNEL_BUILD_RECORD_SIZE;
if (isECIES)
if (j == i)
{
if (j == i)
uint8_t nonce[12];
memset (nonce, 0, 12);
auto& noiseState = i2p::context.GetCurrentNoiseState ();
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState.m_H, 32, noiseState.m_CK, nonce, reply, TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
{
uint8_t nonce[12];
memset (nonce, 0, 12);
auto& noiseState = i2p::context.GetCurrentNoiseState ();
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState.m_H, 32, noiseState.m_CK, nonce, reply, TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
{
LogPrint (eLogWarning, "I2NP: Reply AEAD encryption failed");
return false;
}
}
else
{
encryption.SetKey (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET);
encryption.SetIV (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_IV_OFFSET);
encryption.Encrypt(reply, TUNNEL_BUILD_RECORD_SIZE, reply);
LogPrint (eLogWarning, "I2NP: Reply AEAD encryption failed");
return false;
}
}
else
{
encryption.SetKey (clearText + BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET);
encryption.SetIV (clearText + BUILD_REQUEST_RECORD_REPLY_IV_OFFSET);
encryption.SetKey (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET);
encryption.SetIV (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_IV_OFFSET);
encryption.Encrypt(reply, TUNNEL_BUILD_RECORD_SIZE, reply);
}
}
@ -499,75 +471,28 @@ namespace i2p @@ -499,75 +471,28 @@ namespace i2p
}
else
{
if (i2p::context.IsECIES ())
uint8_t clearText[ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (num, buf + 1, clearText))
{
uint8_t clearText[ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (num, buf + 1, clearText))
if (clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG) // 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,
CreateTunnelGatewayMsg (bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
eI2NPVariableTunnelBuildReply, buf, len,
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
else
transports.SendMessage (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len,
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
}
else
{
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (num, buf + 1, clearText))
{
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,
CreateTunnelGatewayMsg (bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
eI2NPVariableTunnelBuildReply, buf, len,
bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
else
transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len,
bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
// so we send it to reply tunnel
transports.SendMessage (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateTunnelGatewayMsg (bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
eI2NPVariableTunnelBuildReply, buf, len,
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
else
transports.SendMessage (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len,
bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
}
}
static void HandleTunnelBuildMsg (uint8_t * buf, size_t len)
{
if (i2p::context.IsECIES ())
{
LogPrint (eLogWarning, "I2NP: TunnelBuild is too old for ECIES router");
return;
}
if (len < NUM_TUNNEL_BUILD_RECORDS*TUNNEL_BUILD_RECORD_SIZE)
{
LogPrint (eLogError, "I2NP: TunnelBuild message is too short ", len);
return;
}
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
if (HandleBuildRequestRecords (NUM_TUNNEL_BUILD_RECORDS, buf, clearText))
{
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,
CreateTunnelGatewayMsg (bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
eI2NPTunnelBuildReply, buf, len,
bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
else
transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateI2NPMessage (eI2NPTunnelBuild, buf, len,
bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
}
LogPrint (eLogWarning, "I2NP: TunnelBuild is too old for ECIES router");
}
static void HandleTunnelBuildReplyMsg (uint32_t replyMsgID, uint8_t * buf, size_t len, bool isShort)

21
libi2pd/I2NPProtocol.h
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@ -57,31 +57,10 @@ namespace i2p @@ -57,31 +57,10 @@ namespace i2p
const size_t TUNNEL_BUILD_RECORD_SIZE = 528;
const size_t SHORT_TUNNEL_BUILD_RECORD_SIZE = 218;
//BuildRequestRecordClearText
const size_t BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET = 0;
const size_t BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET = BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET = BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET = BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET = BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_IV_KEY_OFFSET = BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET = BUILD_REQUEST_RECORD_IV_KEY_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_REPLY_IV_OFFSET = BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET + 32;
const size_t BUILD_REQUEST_RECORD_FLAG_OFFSET = BUILD_REQUEST_RECORD_REPLY_IV_OFFSET + 16;
const size_t BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET = BUILD_REQUEST_RECORD_FLAG_OFFSET + 1;
const size_t BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET = BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_PADDING_OFFSET = BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET + 4;
const size_t BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE = 222;
// BuildRequestRecordEncrypted
const size_t BUILD_REQUEST_RECORD_TO_PEER_OFFSET = 0;
const size_t BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET = BUILD_REQUEST_RECORD_TO_PEER_OFFSET + 16;
// BuildResponseRecord
const size_t BUILD_RESPONSE_RECORD_HASH_OFFSET = 0;
const size_t BUILD_RESPONSE_RECORD_PADDING_OFFSET = 32;
const size_t BUILD_RESPONSE_RECORD_PADDING_SIZE = 495;
const size_t BUILD_RESPONSE_RECORD_RET_OFFSET = BUILD_RESPONSE_RECORD_PADDING_OFFSET + BUILD_RESPONSE_RECORD_PADDING_SIZE;
// ECIES BuildRequestRecordClearText
const size_t ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET = 0;
const size_t ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET = ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET + 4;

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