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create and handle short tunnel build reply

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orignal 2021-07-12 19:40:40 -04:00
parent dbe427d5eb
commit 2c129b6d39
7 changed files with 65 additions and 57 deletions
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87
libi2pd/I2NPProtocol.cpp
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@ -660,68 +660,47 @@ namespace i2p
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);
// 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)
{
memset (reply + SHORT_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
reply[SHORT_RESPONSE_RECORD_RET_OFFSET] = 0; // TODO: correct ret code
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState.m_H, 32, replyKey, 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;
}
// send reply
if (isEndpoint)
{
// 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)
{
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));
auto replyMsg = NewI2NPShortMessage ();
replyMsg->Concat (buf, len);
replyMsg->FillI2NPMessageHeader (eI2NPShortTunnelBuildReply, bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET));
i2p::crypto::HKDF (noiseState.m_CK, nullptr, 0, "RGarlicKeyAndTag", noiseState.m_CK);
uint64_t tag;
memcpy (&tag, noiseState.m_CK, 8);
// send garlic to reply tunnel
// we send it to reply tunnel
transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
CreateTunnelGatewayMsg (bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
i2p::garlic::WrapECIESX25519Message (otbrm, noiseState.m_CK + 32, 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)
{
memset (reply + SHORT_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
reply[SHORT_RESPONSE_RECORD_RET_OFFSET] = 0; // TODO: correct ret code
if (!i2p::crypto::AEADChaCha20Poly1305 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE - 16,
noiseState.m_H, 32, replyKey, 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;
}
CreateTunnelGatewayMsg (bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
i2p::garlic::WrapECIESX25519Message (replyMsg, noiseState.m_CK + 32, tag)));
}
else
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;
@ -843,6 +822,7 @@ namespace i2p
HandleVariableTunnelBuildMsg (msgID, buf, size);
break;
case eI2NPVariableTunnelBuildReply:
case eI2NPShortTunnelBuildReply:
HandleVariableTunnelBuildReplyMsg (msgID, buf, size);
break;
case eI2NPShortTunnelBuild:
@ -905,6 +885,7 @@ namespace i2p
case eI2NPTunnelBuild:
case eI2NPTunnelBuildReply:
case eI2NPShortTunnelBuild:
case eI2NPShortTunnelBuildReply:
// forward to tunnel thread
i2p::tunnel::tunnels.PostTunnelData (msg);
break;