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