mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-05 15:11:13 +00:00
480 lines
15 KiB
C++
480 lines
15 KiB
C++
#include <string.h>
|
|
#include "I2PEndian.h"
|
|
#include <cryptopp/sha.h>
|
|
#include <cryptopp/modes.h>
|
|
#include <cryptopp/aes.h>
|
|
#include <cryptopp/gzip.h>
|
|
#include "ElGamal.h"
|
|
#include "Timestamp.h"
|
|
#include "RouterContext.h"
|
|
#include "NetDb.h"
|
|
#include "Tunnel.h"
|
|
#include "base64.h"
|
|
#include "Transports.h"
|
|
#include "Garlic.h"
|
|
#include "I2NPProtocol.h"
|
|
|
|
namespace i2p
|
|
{
|
|
|
|
I2NPMessage * NewI2NPMessage ()
|
|
{
|
|
I2NPMessage * msg = new I2NPMessage;
|
|
msg->offset = 2; // reserve 2 bytes for NTCP header, should reserve more for SSU in future
|
|
msg->len = sizeof (I2NPHeader) + 2;
|
|
return msg;
|
|
}
|
|
|
|
void DeleteI2NPMessage (I2NPMessage * msg)
|
|
{
|
|
delete msg;
|
|
}
|
|
|
|
void FillI2NPMessageHeader (I2NPMessage * msg, I2NPMessageType msgType, uint32_t replyMsgID)
|
|
{
|
|
static uint32_t msgID = 0;
|
|
I2NPHeader * header = msg->GetHeader ();
|
|
header->typeID = msgType;
|
|
if (replyMsgID) // for tunnel creation
|
|
header->msgID = htobe32 (replyMsgID);
|
|
else
|
|
{
|
|
header->msgID = htobe32 (msgID);
|
|
msgID++;
|
|
}
|
|
header->expiration = htobe64 (i2p::util::GetMillisecondsSinceEpoch () + 5000); // TODO: 5 secs is a magic number
|
|
int len = msg->GetLength () - sizeof (I2NPHeader);
|
|
header->size = htobe16 (len);
|
|
uint8_t hash[32];
|
|
CryptoPP::SHA256().CalculateDigest(hash, msg->GetPayload (), len);
|
|
header->chks = hash[0];
|
|
}
|
|
|
|
I2NPMessage * CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, int len, uint32_t replyMsgID)
|
|
{
|
|
I2NPMessage * msg = NewI2NPMessage ();
|
|
memcpy (msg->GetPayload (), buf, len);
|
|
msg->len += len;
|
|
FillI2NPMessageHeader (msg, msgType, replyMsgID);
|
|
return msg;
|
|
}
|
|
|
|
I2NPMessage * CreateI2NPMessage (const uint8_t * buf, int len)
|
|
{
|
|
I2NPMessage * msg = NewI2NPMessage ();
|
|
memcpy (msg->GetBuffer (), buf, len);
|
|
msg->len += msg->offset + len;
|
|
return msg;
|
|
}
|
|
|
|
I2NPMessage * CreateDeliveryStatusMsg (uint32_t msgID)
|
|
{
|
|
#pragma pack(1)
|
|
struct
|
|
{
|
|
uint32_t msgID;
|
|
uint64_t timestamp;
|
|
} msg;
|
|
#pragma pack ()
|
|
|
|
msg.msgID = htobe32 (msgID);
|
|
msg.timestamp = htobe64 (i2p::util::GetMillisecondsSinceEpoch ());
|
|
return CreateI2NPMessage (eI2NPDeliveryStatus, (uint8_t *)&msg, sizeof (msg));
|
|
}
|
|
|
|
I2NPMessage * CreateDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
|
|
uint32_t replyTunnelID, bool exploratory, std::set<i2p::data::IdentHash> * excludedPeers)
|
|
{
|
|
I2NPMessage * m = NewI2NPMessage ();
|
|
uint8_t * buf = m->GetPayload ();
|
|
memcpy (buf, key, 32); // key
|
|
buf += 32;
|
|
memcpy (buf, from, 32); // from
|
|
buf += 32;
|
|
if (replyTunnelID)
|
|
{
|
|
*buf = 0x01; // set delivery flag
|
|
*(uint32_t *)(buf+1) = htobe32 (replyTunnelID);
|
|
buf += 5;
|
|
}
|
|
else
|
|
{
|
|
*buf = 0; // flag
|
|
buf++;
|
|
}
|
|
|
|
if (exploratory)
|
|
{
|
|
*(uint16_t *)buf = htobe16 (1); // one exlude record
|
|
buf += 2;
|
|
// reply with non-floodfill routers only
|
|
memset (buf, 0, 32);
|
|
buf += 32;
|
|
}
|
|
else
|
|
{
|
|
if (excludedPeers)
|
|
{
|
|
int cnt = excludedPeers->size ();
|
|
*(uint16_t *)buf = htobe16 (cnt);
|
|
buf += 2;
|
|
for (auto& it: *excludedPeers)
|
|
{
|
|
memcpy (buf, it, 32);
|
|
buf += 32;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// nothing to exclude
|
|
*(uint16_t *)buf = htobe16 (0);
|
|
buf += 2;
|
|
}
|
|
}
|
|
m->len += (buf - m->GetPayload ());
|
|
FillI2NPMessageHeader (m, eI2NPDatabaseLookup);
|
|
return m;
|
|
}
|
|
|
|
void HandleDatabaseLookupMsg (uint8_t * buf, size_t len)
|
|
{
|
|
char key[48];
|
|
int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
|
|
key[l] = 0;
|
|
LogPrint ("DatabaseLookup for ", key, " recieved");
|
|
uint8_t flag = buf[64];
|
|
uint32_t replyTunnelID = 0;
|
|
if (flag & 0x01) //reply to yunnel
|
|
replyTunnelID = be32toh (*(uint32_t *)(buf + 64));
|
|
// TODO: implement search. We send non-found for now
|
|
I2NPMessage * replyMsg = CreateDatabaseSearchReply (buf);
|
|
if (replyTunnelID)
|
|
i2p::tunnel::tunnels.GetNextOutboundTunnel ()->SendTunnelDataMsg (buf+32, replyTunnelID, replyMsg);
|
|
else
|
|
i2p::transports.SendMessage (buf, replyMsg);
|
|
}
|
|
|
|
I2NPMessage * CreateDatabaseSearchReply (const i2p::data::IdentHash& ident)
|
|
{
|
|
I2NPMessage * m = NewI2NPMessage ();
|
|
uint8_t * buf = m->GetPayload ();
|
|
memcpy (buf, ident, 32);
|
|
buf[32] = 0; // TODO:
|
|
memcpy (buf + 33, i2p::context.GetRouterInfo ().GetIdentHash (), 32);
|
|
m->len += 65;
|
|
FillI2NPMessageHeader (m, eI2NPDatabaseSearchReply);
|
|
return m;
|
|
}
|
|
|
|
I2NPMessage * CreateDatabaseStoreMsg ()
|
|
{
|
|
I2NPMessage * m = NewI2NPMessage ();
|
|
I2NPDatabaseStoreMsg * msg = (I2NPDatabaseStoreMsg *)m->GetPayload ();
|
|
|
|
memcpy (msg->key, context.GetRouterInfo ().GetIdentHash (), 32);
|
|
msg->type = 0;
|
|
msg->replyToken = 0;
|
|
|
|
CryptoPP::Gzip compressor;
|
|
compressor.Put ((uint8_t *)context.GetRouterInfo ().GetBuffer (), context.GetRouterInfo ().GetBufferLen ());
|
|
compressor.MessageEnd();
|
|
int size = compressor.MaxRetrievable ();
|
|
uint8_t * buf = m->GetPayload () + sizeof (I2NPDatabaseStoreMsg);
|
|
*(uint16_t *)buf = htobe16 (size); // size
|
|
buf += 2;
|
|
compressor.Get (buf, size);
|
|
m->len += sizeof (I2NPDatabaseStoreMsg) + 2 + size; // payload size
|
|
FillI2NPMessageHeader (m, eI2NPDatabaseStore);
|
|
|
|
return m;
|
|
}
|
|
|
|
|
|
I2NPBuildRequestRecordClearText CreateBuildRequestRecord (
|
|
const uint8_t * ourIdent, uint32_t receiveTunnelID,
|
|
const uint8_t * nextIdent, uint32_t nextTunnelID,
|
|
const uint8_t * layerKey,const uint8_t * ivKey,
|
|
const uint8_t * replyKey, const uint8_t * replyIV, uint32_t nextMessageID,
|
|
bool isGateway, bool isEndpoint)
|
|
{
|
|
I2NPBuildRequestRecordClearText clearText;
|
|
clearText.receiveTunnel = htobe32 (receiveTunnelID);
|
|
clearText.nextTunnel = htobe32(nextTunnelID);
|
|
memcpy (clearText.layerKey, layerKey, 32);
|
|
memcpy (clearText.ivKey, ivKey, 32);
|
|
memcpy (clearText.replyKey, replyKey, 32);
|
|
memcpy (clearText.replyIV, replyIV, 16);
|
|
clearText.flag = 0;
|
|
if (isGateway) clearText.flag |= 0x80;
|
|
if (isEndpoint) clearText.flag |= 0x40;
|
|
memcpy (clearText.ourIdent, ourIdent, 32);
|
|
memcpy (clearText.nextIdent, nextIdent, 32);
|
|
clearText.requestTime = i2p::util::GetHoursSinceEpoch ();
|
|
clearText.nextMessageID = htobe32(nextMessageID);
|
|
return clearText;
|
|
}
|
|
|
|
void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router,
|
|
const I2NPBuildRequestRecordClearText& clearText,
|
|
I2NPBuildRequestRecordElGamalEncrypted& record)
|
|
{
|
|
i2p::crypto::ElGamalEncrypt (router.GetRouterIdentity ().publicKey, (uint8_t *)&clearText, sizeof(clearText), record.encrypted);
|
|
memcpy (record.toPeer, (const uint8_t *)router.GetIdentHash (), 16);
|
|
}
|
|
|
|
void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len)
|
|
{
|
|
int num = buf[0];
|
|
LogPrint ("VariableTunnelBuild ", num, " records");
|
|
|
|
i2p::tunnel::Tunnel * tunnel = i2p::tunnel::tunnels.GetPendingTunnel (replyMsgID);
|
|
if (tunnel)
|
|
{
|
|
// endpoint of inbound tunnel
|
|
LogPrint ("VariableTunnelBuild reply for tunnel ", tunnel->GetTunnelID ());
|
|
if (tunnel->HandleTunnelBuildResponse (buf, len))
|
|
{
|
|
LogPrint ("Inbound tunnel ", tunnel->GetTunnelID (), " has been created");
|
|
i2p::tunnel::tunnels.AddInboundTunnel (static_cast<i2p::tunnel::InboundTunnel *>(tunnel));
|
|
}
|
|
else
|
|
{
|
|
LogPrint ("Inbound tunnel ", tunnel->GetTunnelID (), " has been declined");
|
|
delete tunnel;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
I2NPBuildRequestRecordElGamalEncrypted * records = (I2NPBuildRequestRecordElGamalEncrypted *)(buf+1);
|
|
for (int i = 0; i < num; i++)
|
|
{
|
|
if (!memcmp (records[i].toPeer, (const uint8_t *)i2p::context.GetRouterInfo ().GetIdentHash (), 16))
|
|
{
|
|
LogPrint ("Record ",i," is ours");
|
|
|
|
I2NPBuildRequestRecordClearText clearText;
|
|
i2p::crypto::ElGamalDecrypt (i2p::context.GetPrivateKey (), records[i].encrypted, (uint8_t *)&clearText);
|
|
|
|
i2p::tunnel::TransitTunnel * transitTunnel =
|
|
i2p::tunnel::CreateTransitTunnel (
|
|
be32toh (clearText.receiveTunnel),
|
|
clearText.nextIdent, be32toh (clearText.nextTunnel),
|
|
clearText.layerKey, clearText.ivKey,
|
|
clearText.flag & 0x80, clearText.flag & 0x40);
|
|
i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
|
|
// replace record to reply
|
|
I2NPBuildResponseRecord * reply = (I2NPBuildResponseRecord *)(records + i);
|
|
reply->ret = 0;
|
|
//TODO: fill filler
|
|
CryptoPP::SHA256().CalculateDigest(reply->hash, reply->padding, sizeof (reply->padding) + 1); // + 1 byte of ret
|
|
// encrypt reply
|
|
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption encryption;
|
|
for (int j = 0; j < num; j++)
|
|
{
|
|
encryption.SetKeyWithIV (clearText.replyKey, 32, clearText.replyIV);
|
|
encryption.ProcessData((uint8_t *)(records + j), (uint8_t *)(records + j), sizeof (records[j]));
|
|
}
|
|
|
|
if (clearText.flag & 0x40) // we are endpoint of outboud tunnel
|
|
{
|
|
// so we send it to reply tunnel
|
|
i2p::transports.SendMessage (clearText.nextIdent,
|
|
CreateTunnelGatewayMsg (be32toh (clearText.nextTunnel),
|
|
eI2NPVariableTunnelBuildReply, buf, len,
|
|
be32toh (clearText.nextMessageID)));
|
|
}
|
|
else
|
|
i2p::transports.SendMessage (clearText.nextIdent,
|
|
CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len, be32toh (clearText.nextMessageID)));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void HandleVariableTunnelBuildReplyMsg (uint32_t replyMsgID, uint8_t * buf, size_t len)
|
|
{
|
|
LogPrint ("VariableTunnelBuildReplyMsg replyMsgID=", replyMsgID);
|
|
i2p::tunnel::Tunnel * tunnel = i2p::tunnel::tunnels.GetPendingTunnel (replyMsgID);
|
|
if (tunnel)
|
|
{
|
|
// reply for outbound tunnel
|
|
if (tunnel->HandleTunnelBuildResponse (buf, len))
|
|
{
|
|
LogPrint ("Outbound tunnel ", tunnel->GetTunnelID (), " has been created");
|
|
i2p::tunnel::tunnels.AddOutboundTunnel (static_cast<i2p::tunnel::OutboundTunnel *>(tunnel));
|
|
}
|
|
else
|
|
{
|
|
LogPrint ("Outbound tunnel ", tunnel->GetTunnelID (), " has been declined");
|
|
delete tunnel;
|
|
}
|
|
}
|
|
else
|
|
LogPrint ("Pending tunnel for message ", replyMsgID, " not found");
|
|
}
|
|
|
|
|
|
I2NPMessage * CreateTunnelDataMsg (const uint8_t * buf)
|
|
{
|
|
I2NPMessage * msg = NewI2NPMessage ();
|
|
memcpy (msg->GetPayload (), buf, i2p::tunnel::TUNNEL_DATA_MSG_SIZE);
|
|
msg->len += i2p::tunnel::TUNNEL_DATA_MSG_SIZE;
|
|
FillI2NPMessageHeader (msg, eI2NPTunnelData);
|
|
return msg;
|
|
}
|
|
|
|
I2NPMessage * CreateTunnelDataMsg (uint32_t tunnelID, const uint8_t * payload)
|
|
{
|
|
I2NPMessage * msg = NewI2NPMessage ();
|
|
memcpy (msg->GetPayload () + 4, payload, i2p::tunnel::TUNNEL_DATA_MSG_SIZE - 4);
|
|
*(uint32_t *)(msg->GetPayload ()) = htobe32 (tunnelID);
|
|
msg->len += i2p::tunnel::TUNNEL_DATA_MSG_SIZE;
|
|
FillI2NPMessageHeader (msg, eI2NPTunnelData);
|
|
return msg;
|
|
}
|
|
|
|
I2NPMessage * CreateTunnelGatewayMsg (uint32_t tunnelID, const uint8_t * buf, size_t len)
|
|
{
|
|
I2NPMessage * msg = NewI2NPMessage ();
|
|
TunnelGatewayHeader * header = (TunnelGatewayHeader *)msg->GetPayload ();
|
|
header->tunnelID = htobe32 (tunnelID);
|
|
header->length = htobe16 (len);
|
|
memcpy (msg->GetPayload () + sizeof (TunnelGatewayHeader), buf, len);
|
|
msg->len += sizeof (TunnelGatewayHeader) + len;
|
|
FillI2NPMessageHeader (msg, eI2NPTunnelGateway);
|
|
return msg;
|
|
}
|
|
|
|
I2NPMessage * CreateTunnelGatewayMsg (uint32_t tunnelID, I2NPMessage * msg)
|
|
{
|
|
if (msg->offset >= sizeof (I2NPHeader) + sizeof (TunnelGatewayHeader))
|
|
{
|
|
// message is capable to be used without copying
|
|
TunnelGatewayHeader * header = (TunnelGatewayHeader *)(msg->GetBuffer () - sizeof (TunnelGatewayHeader));
|
|
header->tunnelID = htobe32 (tunnelID);
|
|
int len = msg->GetLength ();
|
|
header->length = htobe16 (len);
|
|
msg->offset -= (sizeof (I2NPHeader) + sizeof (TunnelGatewayHeader));
|
|
msg->len = msg->offset + sizeof (I2NPHeader) + sizeof (TunnelGatewayHeader) +len;
|
|
FillI2NPMessageHeader (msg, eI2NPTunnelGateway);
|
|
return msg;
|
|
}
|
|
else
|
|
{
|
|
I2NPMessage * msg1 = CreateTunnelGatewayMsg (tunnelID, msg->GetBuffer (), msg->GetLength ());
|
|
DeleteI2NPMessage (msg);
|
|
return msg1;
|
|
}
|
|
}
|
|
|
|
I2NPMessage * CreateTunnelGatewayMsg (uint32_t tunnelID, I2NPMessageType msgType,
|
|
const uint8_t * buf, size_t len, uint32_t replyMsgID)
|
|
{
|
|
I2NPMessage * msg = NewI2NPMessage ();
|
|
size_t gatewayMsgOffset = sizeof (I2NPHeader) + sizeof (TunnelGatewayHeader);
|
|
msg->offset += gatewayMsgOffset;
|
|
msg->len += gatewayMsgOffset;
|
|
memcpy (msg->GetPayload (), buf, len);
|
|
msg->len += len;
|
|
FillI2NPMessageHeader (msg, msgType, replyMsgID); // create content message
|
|
len = msg->GetLength ();
|
|
msg->offset -= gatewayMsgOffset;
|
|
TunnelGatewayHeader * header = (TunnelGatewayHeader *)msg->GetPayload ();
|
|
header->tunnelID = htobe32 (tunnelID);
|
|
header->length = htobe16 (len);
|
|
FillI2NPMessageHeader (msg, eI2NPTunnelGateway); // gateway message
|
|
return msg;
|
|
}
|
|
|
|
void HandleTunnelGatewayMsg (I2NPMessage * msg)
|
|
{
|
|
TunnelGatewayHeader * header = (TunnelGatewayHeader *)msg->GetPayload ();
|
|
uint32_t tunnelID = be32toh(header->tunnelID);
|
|
uint16_t len = be16toh(header->length);
|
|
LogPrint ("TunnelGateway of ", (int)len, " bytes for tunnel ", (unsigned int)tunnelID);
|
|
i2p::tunnel::TransitTunnel * tunnel = i2p::tunnel::tunnels.GetTransitTunnel (tunnelID);
|
|
if (tunnel)
|
|
{
|
|
// we make payload as new I2NP message to send
|
|
msg->offset += sizeof (I2NPHeader) + sizeof (TunnelGatewayHeader);
|
|
msg->len = msg->offset + len;
|
|
tunnel->SendTunnelDataMsg (nullptr, 0, msg);
|
|
}
|
|
else
|
|
{
|
|
LogPrint ("Tunnel ", (unsigned int)tunnelID, " not found");
|
|
i2p::DeleteI2NPMessage (msg);
|
|
}
|
|
}
|
|
|
|
size_t GetI2NPMessageLength (uint8_t * msg)
|
|
{
|
|
I2NPHeader * header = (I2NPHeader *)msg;
|
|
return be16toh (header->size) + sizeof (I2NPHeader);
|
|
}
|
|
|
|
void HandleI2NPMessage (uint8_t * msg, size_t len, bool isFromTunnel)
|
|
{
|
|
I2NPHeader * header = (I2NPHeader *)msg;
|
|
uint32_t msgID = be32toh (header->msgID);
|
|
LogPrint ("I2NP msg received len=", len,", type=", (int)header->typeID, ", msgID=", (unsigned int)msgID);
|
|
|
|
uint8_t * buf = msg + sizeof (I2NPHeader);
|
|
int size = be16toh (header->size);
|
|
switch (header->typeID)
|
|
{
|
|
case eI2NPGarlic:
|
|
LogPrint ("Garlic");
|
|
i2p::garlic::routing.HandleGarlicMessage (buf, size, isFromTunnel);
|
|
break;
|
|
break;
|
|
case eI2NPDeliveryStatus:
|
|
LogPrint ("DeliveryStatus");
|
|
break;
|
|
case eI2NPVariableTunnelBuild:
|
|
LogPrint ("VariableTunnelBuild");
|
|
HandleVariableTunnelBuildMsg (msgID, buf, size);
|
|
break;
|
|
case eI2NPVariableTunnelBuildReply:
|
|
LogPrint ("VariableTunnelBuildReply");
|
|
HandleVariableTunnelBuildReplyMsg (msgID, buf, size);
|
|
break;
|
|
case eI2NPDatabaseLookup:
|
|
LogPrint ("DatabaseLookup");
|
|
HandleDatabaseLookupMsg (buf, size);
|
|
break;
|
|
default:
|
|
LogPrint ("Unexpected message ", (int)header->typeID);
|
|
}
|
|
}
|
|
|
|
void HandleI2NPMessage (I2NPMessage * msg, bool isFromTunnel)
|
|
{
|
|
if (msg)
|
|
{
|
|
switch (msg->GetHeader ()->typeID)
|
|
{
|
|
case eI2NPTunnelData:
|
|
LogPrint ("TunnelData");
|
|
i2p::tunnel::tunnels.PostTunnelData (msg);
|
|
break;
|
|
case eI2NPTunnelGateway:
|
|
LogPrint ("TunnelGateway");
|
|
HandleTunnelGatewayMsg (msg);
|
|
break;
|
|
case eI2NPDatabaseStore:
|
|
LogPrint ("DatabaseStore");
|
|
i2p::data::netdb.PostI2NPMsg (msg);
|
|
break;
|
|
case eI2NPDatabaseSearchReply:
|
|
LogPrint ("DatabaseSearchReply");
|
|
i2p::data::netdb.PostI2NPMsg (msg);
|
|
break;
|
|
default:
|
|
HandleI2NPMessage (msg->GetBuffer (), msg->GetLength (), isFromTunnel);
|
|
DeleteI2NPMessage (msg);
|
|
}
|
|
}
|
|
}
|
|
}
|