mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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559 lines
18 KiB
559 lines
18 KiB
#include <string.h> |
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#include <atomic> |
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#include "I2PEndian.h" |
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#include <cryptopp/sha.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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return new I2NPMessageBuffer<I2NP_MAX_MESSAGE_SIZE>(); |
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} |
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I2NPMessage * NewI2NPShortMessage () |
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{ |
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return new I2NPMessageBuffer<I2NP_MAX_SHORT_MESSAGE_SIZE>(); |
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} |
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I2NPMessage * NewI2NPMessage (size_t len) |
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{ |
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return (len < I2NP_MAX_SHORT_MESSAGE_SIZE/2) ? NewI2NPShortMessage () : NewI2NPMessage (); |
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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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static std::atomic<uint32_t> I2NPmsgID(0); // TODO: create class |
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void FillI2NPMessageHeader (I2NPMessage * msg, I2NPMessageType msgType, uint32_t replyMsgID) |
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{ |
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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 (I2NPmsgID); |
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I2NPmsgID++; |
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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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void RenewI2NPMessageHeader (I2NPMessage * msg) |
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{ |
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if (msg) |
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{ |
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I2NPHeader * header = msg->GetHeader (); |
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header->msgID = htobe32 (I2NPmsgID); |
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I2NPmsgID++; |
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header->expiration = htobe64 (i2p::util::GetMillisecondsSinceEpoch () + 5000); |
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} |
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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 (len); |
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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 (uint32_t msgID) |
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{ |
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I2NPDeliveryStatusMsg msg; |
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if (msgID) |
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{ |
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msg.msgID = htobe32 (msgID); |
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msg.timestamp = htobe64 (i2p::util::GetMillisecondsSinceEpoch ()); |
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} |
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else // for SSU establishment |
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{ |
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msg.msgID = htobe32 (i2p::context.GetRandomNumberGenerator ().GenerateWord32 ()); |
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msg.timestamp = htobe64 (2); // netID = 2 |
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} |
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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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bool encryption) |
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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 = encryption ? 0x03: 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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encryption = false; // encryption can we set for tunnels only |
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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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if (encryption) |
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{ |
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// session key and tag for reply |
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auto& rnd = i2p::context.GetRandomNumberGenerator (); |
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rnd.GenerateBlock (buf, 32); // key |
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buf[32] = 1; // 1 tag |
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rnd.GenerateBlock (buf + 33, 32); // tag |
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i2p::garlic::routing.AddSessionKey (buf, buf + 33); // introduce new key-tag to garlic engine |
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buf += 65; |
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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 * CreateDatabaseSearchReply (const i2p::data::IdentHash& ident, |
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const i2p::data::RouterInfo * floodfill) |
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{ |
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I2NPMessage * m = NewI2NPShortMessage (); |
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uint8_t * buf = m->GetPayload (); |
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size_t len = 0; |
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memcpy (buf, ident, 32); |
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len += 32; |
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buf[len] = floodfill ? 1 : 0; // 1 router for now |
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len++; |
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if (floodfill) |
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{ |
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memcpy (buf + len, floodfill->GetIdentHash (), 32); |
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len += 32; |
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} |
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memcpy (buf + len, i2p::context.GetRouterInfo ().GetIdentHash (), 32); |
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len += 32; |
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m->len += len; |
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FillI2NPMessageHeader (m, eI2NPDatabaseSearchReply); |
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return m; |
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} |
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I2NPMessage * CreateDatabaseStoreMsg (const i2p::data::RouterInfo * router) |
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{ |
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if (!router) // we send own RouterInfo |
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router = &context.GetRouterInfo (); |
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I2NPMessage * m = NewI2NPShortMessage (); |
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I2NPDatabaseStoreMsg * msg = (I2NPDatabaseStoreMsg *)m->GetPayload (); |
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memcpy (msg->key, router->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 (router->GetBuffer (), router->GetBufferLen ()); |
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compressor.MessageEnd(); |
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auto 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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// TODO: check if size doesn't exceed buffer |
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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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I2NPMessage * CreateDatabaseStoreMsg (const i2p::data::LeaseSet * leaseSet) |
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{ |
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if (!leaseSet) return nullptr; |
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I2NPMessage * m = NewI2NPShortMessage (); |
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I2NPDatabaseStoreMsg * msg = (I2NPDatabaseStoreMsg *)m->GetPayload (); |
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memcpy (msg->key, leaseSet->GetIdentHash (), 32); |
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msg->type = 1; // LeaseSet |
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msg->replyToken = 0; |
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memcpy (m->GetPayload () + sizeof (I2NPDatabaseStoreMsg), leaseSet->GetBuffer (), leaseSet->GetBufferLen ()); |
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m->len += leaseSet->GetBufferLen () + sizeof (I2NPDatabaseStoreMsg); |
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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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router.GetElGamalEncryption ()->Encrypt ((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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bool HandleBuildRequestRecords (int num, I2NPBuildRequestRecordElGamalEncrypted * records, I2NPBuildRequestRecordClearText& clearText) |
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{ |
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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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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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i2p::crypto::CBCEncryption encryption; |
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for (int j = 0; j < num; j++) |
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{ |
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encryption.SetKey (clearText.replyKey); |
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encryption.SetIV (clearText.replyIV); |
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encryption.Encrypt((uint8_t *)(records + j), sizeof (records[j]), (uint8_t *)(records + j)); |
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} |
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return true; |
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} |
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} |
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return false; |
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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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I2NPBuildRequestRecordClearText clearText; |
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if (HandleBuildRequestRecords (num, records, clearText)) |
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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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} |
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} |
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} |
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void HandleTunnelBuildMsg (uint8_t * buf, size_t len) |
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{ |
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I2NPBuildRequestRecordClearText clearText; |
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if (HandleBuildRequestRecords (NUM_TUNNEL_BUILD_RECORDS, (I2NPBuildRequestRecordElGamalEncrypted *)buf, clearText)) |
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{ |
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if (clearText.flag & 0x40) // we are endpoint of outbound 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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eI2NPTunnelBuildReply, 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 (eI2NPTunnelBuild, buf, len, be32toh (clearText.nextMessageID))); |
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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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i2p::transports.CloseSession (tunnel->GetTunnelConfig ()->GetFirstHop ()->router); |
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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 (len); |
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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 (len); |
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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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// 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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LogPrint ("TunnelGateway of ", (int)len, " bytes for tunnel ", (unsigned int)tunnelID, ". Msg type ", (int)msg->GetHeader()->typeID); |
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if (msg->GetHeader()->typeID == eI2NPDatabaseStore || |
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msg->GetHeader()->typeID == eI2NPDatabaseSearchReply) |
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{ |
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// transit DatabaseStore my contain new/updated RI |
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// or DatabaseSearchReply with new routers |
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auto ds = NewI2NPMessage (); |
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*ds = *msg; |
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i2p::data::netdb.PostI2NPMsg (ds); |
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} |
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i2p::tunnel::TransitTunnel * tunnel = i2p::tunnel::tunnels.GetTransitTunnel (tunnelID); |
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if (tunnel) |
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tunnel->SendTunnelDataMsg (msg); |
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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) |
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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 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: |
|
LogPrint ("VariableTunnelBuildReply"); |
|
HandleVariableTunnelBuildReplyMsg (msgID, buf, size); |
|
break; |
|
case eI2NPTunnelBuild: |
|
LogPrint ("TunnelBuild"); |
|
HandleTunnelBuildMsg (buf, size); |
|
break; |
|
case eI2NPTunnelBuildReply: |
|
LogPrint ("TunnelBuildReply"); |
|
// TODO: |
|
break; |
|
default: |
|
LogPrint ("Unexpected message ", (int)header->typeID); |
|
} |
|
} |
|
|
|
void HandleI2NPMessage (I2NPMessage * msg) |
|
{ |
|
if (msg) |
|
{ |
|
switch (msg->GetHeader ()->typeID) |
|
{ |
|
case eI2NPTunnelData: |
|
LogPrint ("TunnelData"); |
|
i2p::tunnel::tunnels.PostTunnelData (msg); |
|
break; |
|
case eI2NPTunnelGateway: |
|
LogPrint ("TunnelGateway"); |
|
HandleTunnelGatewayMsg (msg); |
|
break; |
|
case eI2NPGarlic: |
|
LogPrint ("Garlic"); |
|
i2p::garlic::routing.PostI2NPMsg (msg); |
|
break; |
|
case eI2NPDatabaseStore: |
|
case eI2NPDatabaseSearchReply: |
|
case eI2NPDatabaseLookup: |
|
// forward to netDb |
|
i2p::data::netdb.PostI2NPMsg (msg); |
|
break; |
|
case eI2NPDeliveryStatus: |
|
LogPrint ("DeliveryStatus"); |
|
if (msg->from && msg->from->GetTunnelPool ()) |
|
msg->from->GetTunnelPool ()->ProcessDeliveryStatus (msg); |
|
else |
|
i2p::garlic::routing.PostI2NPMsg (msg); |
|
break; |
|
default: |
|
HandleI2NPMessage (msg->GetBuffer (), msg->GetLength ()); |
|
DeleteI2NPMessage (msg); |
|
} |
|
} |
|
} |
|
}
|
|
|