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618 lines
18 KiB
C++
618 lines
18 KiB
C++
#include <inttypes.h>
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#include "I2PEndian.h"
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#include <map>
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#include <string>
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#include "RouterContext.h"
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#include "I2NPProtocol.h"
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#include "Tunnel.h"
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#include "TunnelPool.h"
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#include "Timestamp.h"
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#include "Destination.h"
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#include "Garlic.h"
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namespace i2p
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{
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namespace garlic
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{
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GarlicRoutingSession::GarlicRoutingSession (GarlicDestination * owner,
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std::shared_ptr<const i2p::data::RoutingDestination> destination, int numTags, bool attachLeaseSet):
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m_Owner (owner), m_Destination (destination), m_NumTags (numTags),
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m_LeaseSetUpdateStatus (attachLeaseSet ? eLeaseSetUpdated : eLeaseSetDoNotSend)
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{
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// create new session tags and session key
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m_Rnd.GenerateBlock (m_SessionKey, 32);
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m_Encryption.SetKey (m_SessionKey);
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}
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GarlicRoutingSession::GarlicRoutingSession (const uint8_t * sessionKey, const SessionTag& sessionTag):
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m_Owner (nullptr), m_Destination (nullptr), m_NumTags (1), m_LeaseSetUpdateStatus (eLeaseSetDoNotSend)
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{
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memcpy (m_SessionKey, sessionKey, 32);
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m_Encryption.SetKey (m_SessionKey);
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m_SessionTags.push_back (sessionTag);
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m_SessionTags.back ().creationTime = i2p::util::GetSecondsSinceEpoch ();
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}
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GarlicRoutingSession::~GarlicRoutingSession ()
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{
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for (auto it: m_UnconfirmedTagsMsgs)
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delete it.second;
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m_UnconfirmedTagsMsgs.clear ();
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}
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GarlicRoutingSession::UnconfirmedTags * GarlicRoutingSession::GenerateSessionTags ()
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{
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auto tags = new UnconfirmedTags (m_NumTags);
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tags->tagsCreationTime = i2p::util::GetSecondsSinceEpoch ();
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for (int i = 0; i < m_NumTags; i++)
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{
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m_Rnd.GenerateBlock (tags->sessionTags[i], 32);
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tags->sessionTags[i].creationTime = tags->tagsCreationTime;
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}
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return tags;
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}
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void GarlicRoutingSession::MessageConfirmed (uint32_t msgID)
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{
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TagsConfirmed (msgID);
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if (msgID == m_LeaseSetUpdateMsgID)
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{
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m_LeaseSetUpdateStatus = eLeaseSetUpToDate;
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LogPrint (eLogInfo, "LeaseSet update confirmed");
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}
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else
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CleanupExpiredTags ();
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}
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void GarlicRoutingSession::TagsConfirmed (uint32_t msgID)
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{
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auto it = m_UnconfirmedTagsMsgs.find (msgID);
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if (it != m_UnconfirmedTagsMsgs.end ())
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{
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uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
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UnconfirmedTags * tags = it->second;
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if (ts < tags->tagsCreationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT)
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{
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for (int i = 0; i < tags->numTags; i++)
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m_SessionTags.push_back (tags->sessionTags[i]);
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}
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m_UnconfirmedTagsMsgs.erase (it);
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delete tags;
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}
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}
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bool GarlicRoutingSession::CleanupExpiredTags ()
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{
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uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
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for (auto it = m_SessionTags.begin (); it != m_SessionTags.end ();)
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{
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if (ts >= it->creationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT)
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it = m_SessionTags.erase (it);
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else
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it++;
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}
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// delete expired unconfirmed tags
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for (auto it = m_UnconfirmedTagsMsgs.begin (); it != m_UnconfirmedTagsMsgs.end ();)
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{
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if (ts >= it->second->tagsCreationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT)
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{
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if (m_Owner)
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m_Owner->RemoveCreatedSession (it->first);
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delete it->second;
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it = m_UnconfirmedTagsMsgs.erase (it);
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}
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else
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it++;
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}
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return !m_SessionTags.empty () || m_UnconfirmedTagsMsgs.empty ();
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}
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std::shared_ptr<I2NPMessage> GarlicRoutingSession::WrapSingleMessage (std::shared_ptr<I2NPMessage> msg)
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{
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auto m = ToSharedI2NPMessage(NewI2NPMessage ());
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m->Align (12); // in order to get buf aligned to 16 (12 + 4)
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size_t len = 0;
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uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
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// find non-expired tag
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bool tagFound = false;
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SessionTag tag;
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if (m_NumTags > 0)
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{
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uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
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while (!m_SessionTags.empty ())
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{
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if (ts < m_SessionTags.front ().creationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT)
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{
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tag = m_SessionTags.front ();
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m_SessionTags.pop_front (); // use same tag only once
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tagFound = true;
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break;
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}
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else
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m_SessionTags.pop_front (); // remove expired tag
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}
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}
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// create message
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if (!tagFound) // new session
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{
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LogPrint ("No garlic tags available. Use ElGamal");
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if (!m_Destination)
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{
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LogPrint ("Can't use ElGamal for unknown destination");
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return nullptr;
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}
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// create ElGamal block
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ElGamalBlock elGamal;
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memcpy (elGamal.sessionKey, m_SessionKey, 32);
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m_Rnd.GenerateBlock (elGamal.preIV, 32); // Pre-IV
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uint8_t iv[32]; // IV is first 16 bytes
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CryptoPP::SHA256().CalculateDigest(iv, elGamal.preIV, 32);
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m_Destination->GetElGamalEncryption ()->Encrypt ((uint8_t *)&elGamal, sizeof(elGamal), buf, true);
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m_Encryption.SetIV (iv);
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buf += 514;
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len += 514;
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}
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else // existing session
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{
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// session tag
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memcpy (buf, tag, 32);
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uint8_t iv[32]; // IV is first 16 bytes
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CryptoPP::SHA256().CalculateDigest(iv, tag, 32);
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m_Encryption.SetIV (iv);
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buf += 32;
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len += 32;
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}
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// AES block
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len += CreateAESBlock (buf, msg.get ()); // TODO
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htobe32buf (m->GetPayload (), len);
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m->len += len + 4;
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m->FillI2NPMessageHeader (eI2NPGarlic);
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return m;
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}
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size_t GarlicRoutingSession::CreateAESBlock (uint8_t * buf, const I2NPMessage * msg)
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{
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size_t blockSize = 0;
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bool createNewTags = m_Owner && m_NumTags && ((int)m_SessionTags.size () <= m_NumTags*2/3);
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UnconfirmedTags * newTags = createNewTags ? GenerateSessionTags () : nullptr;
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htobuf16 (buf, newTags ? htobe16 (newTags->numTags) : 0); // tag count
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blockSize += 2;
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if (newTags) // session tags recreated
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{
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for (int i = 0; i < newTags->numTags; i++)
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{
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memcpy (buf + blockSize, newTags->sessionTags[i], 32); // tags
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blockSize += 32;
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}
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}
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uint32_t * payloadSize = (uint32_t *)(buf + blockSize);
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blockSize += 4;
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uint8_t * payloadHash = buf + blockSize;
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blockSize += 32;
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buf[blockSize] = 0; // flag
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blockSize++;
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size_t len = CreateGarlicPayload (buf + blockSize, msg, newTags);
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htobe32buf (payloadSize, len);
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CryptoPP::SHA256().CalculateDigest(payloadHash, buf + blockSize, len);
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blockSize += len;
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size_t rem = blockSize % 16;
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if (rem)
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blockSize += (16-rem); //padding
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m_Encryption.Encrypt(buf, blockSize, buf);
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return blockSize;
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}
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size_t GarlicRoutingSession::CreateGarlicPayload (uint8_t * payload, const I2NPMessage * msg, UnconfirmedTags * newTags)
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{
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 5000; // 5 sec
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uint32_t msgID = m_Rnd.GenerateWord32 ();
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size_t size = 0;
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uint8_t * numCloves = payload + size;
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*numCloves = 0;
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size++;
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if (m_Owner)
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{
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// resubmit non-confirmed LeaseSet
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if (m_LeaseSetUpdateStatus == eLeaseSetSubmitted &&
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i2p::util::GetMillisecondsSinceEpoch () > m_LeaseSetSubmissionTime + LEASET_CONFIRMATION_TIMEOUT)
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m_LeaseSetUpdateStatus = eLeaseSetUpdated;
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// attach DeviveryStatus if necessary
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if (newTags || m_LeaseSetUpdateStatus == eLeaseSetUpdated) // new tags created or leaseset updated
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{
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// clove is DeliveryStatus
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auto cloveSize = CreateDeliveryStatusClove (payload + size, msgID);
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if (cloveSize > 0) // successive?
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{
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size += cloveSize;
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(*numCloves)++;
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if (newTags) // new tags created
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m_UnconfirmedTagsMsgs[msgID] = newTags;
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m_Owner->DeliveryStatusSent (shared_from_this (), msgID);
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}
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else
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LogPrint ("DeliveryStatus clove was not created");
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}
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// attach LeaseSet
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if (m_LeaseSetUpdateStatus == eLeaseSetUpdated)
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{
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m_LeaseSetUpdateStatus = eLeaseSetSubmitted;
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m_LeaseSetUpdateMsgID = msgID;
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m_LeaseSetSubmissionTime = i2p::util::GetMillisecondsSinceEpoch ();
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// clove if our leaseSet must be attached
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auto leaseSet = CreateDatabaseStoreMsg (m_Owner->GetLeaseSet ());
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size += CreateGarlicClove (payload + size, leaseSet.get (), false); //TODO
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(*numCloves)++;
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}
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}
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if (msg) // clove message ifself if presented
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{
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size += CreateGarlicClove (payload + size, msg, m_Destination ? m_Destination->IsDestination () : false);
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(*numCloves)++;
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}
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memset (payload + size, 0, 3); // certificate of message
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size += 3;
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htobe32buf (payload + size, msgID); // MessageID
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size += 4;
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htobe64buf (payload + size, ts); // Expiration of message
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size += 8;
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return size;
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}
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size_t GarlicRoutingSession::CreateGarlicClove (uint8_t * buf, const I2NPMessage * msg, bool isDestination)
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{
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 5000; // 5 sec
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size_t size = 0;
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if (isDestination && m_Destination)
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{
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buf[size] = eGarlicDeliveryTypeDestination << 5;// delivery instructions flag destination
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size++;
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memcpy (buf + size, m_Destination->GetIdentHash (), 32);
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size += 32;
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}
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else
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{
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buf[size] = 0;// delivery instructions flag local
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size++;
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}
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memcpy (buf + size, msg->GetBuffer (), msg->GetLength ());
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size += msg->GetLength ();
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htobe32buf (buf + size, m_Rnd.GenerateWord32 ()); // CloveID
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size += 4;
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htobe64buf (buf + size, ts); // Expiration of clove
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size += 8;
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memset (buf + size, 0, 3); // certificate of clove
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size += 3;
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return size;
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}
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size_t GarlicRoutingSession::CreateDeliveryStatusClove (uint8_t * buf, uint32_t msgID)
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{
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size_t size = 0;
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if (m_Owner)
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{
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auto inboundTunnel = m_Owner->GetTunnelPool ()->GetNextInboundTunnel ();
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if (inboundTunnel)
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{
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buf[size] = eGarlicDeliveryTypeTunnel << 5; // delivery instructions flag tunnel
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size++;
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// hash and tunnelID sequence is reversed for Garlic
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memcpy (buf + size, inboundTunnel->GetNextIdentHash (), 32); // To Hash
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size += 32;
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htobe32buf (buf + size, inboundTunnel->GetNextTunnelID ()); // tunnelID
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size += 4;
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// create msg
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auto msg = CreateDeliveryStatusMsg (msgID);
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if (m_Owner)
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{
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//encrypt
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uint8_t key[32], tag[32];
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m_Rnd.GenerateBlock (key, 32); // random session key
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m_Rnd.GenerateBlock (tag, 32); // random session tag
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m_Owner->SubmitSessionKey (key, tag);
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GarlicRoutingSession garlic (key, tag);
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msg = garlic.WrapSingleMessage (msg);
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}
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memcpy (buf + size, msg->GetBuffer (), msg->GetLength ());
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size += msg->GetLength ();
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// fill clove
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch () + 5000; // 5 sec
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htobe32buf (buf + size, m_Rnd.GenerateWord32 ()); // CloveID
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size += 4;
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htobe64buf (buf + size, ts); // Expiration of clove
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size += 8;
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memset (buf + size, 0, 3); // certificate of clove
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size += 3;
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}
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else
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LogPrint (eLogError, "No inbound tunnels in the pool for DeliveryStatus");
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}
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else
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LogPrint ("Missing local LeaseSet");
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return size;
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}
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GarlicDestination::~GarlicDestination ()
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{
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}
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void GarlicDestination::AddSessionKey (const uint8_t * key, const uint8_t * tag)
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{
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if (key)
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{
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uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
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auto decryption = std::make_shared<i2p::crypto::CBCDecryption>();
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decryption->SetKey (key);
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m_Tags[SessionTag(tag, ts)] = decryption;
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}
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}
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bool GarlicDestination::SubmitSessionKey (const uint8_t * key, const uint8_t * tag)
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{
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AddSessionKey (key, tag);
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return true;
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}
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void GarlicDestination::HandleGarlicMessage (std::shared_ptr<I2NPMessage> msg)
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{
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uint8_t * buf = msg->GetPayload ();
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uint32_t length = bufbe32toh (buf);
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if (length > msg->GetLength ())
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{
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LogPrint (eLogError, "Garlic message length ", length, " exceeds I2NP message length ", msg->GetLength ());
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return;
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}
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buf += 4; // length
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auto it = m_Tags.find (SessionTag(buf));
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if (it != m_Tags.end ())
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{
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// tag found. Use AES
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if (length >= 32)
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{
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uint8_t iv[32]; // IV is first 16 bytes
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CryptoPP::SHA256().CalculateDigest(iv, buf, 32);
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it->second->SetIV (iv);
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it->second->Decrypt (buf + 32, length - 32, buf + 32);
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HandleAESBlock (buf + 32, length - 32, it->second, msg->from);
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}
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else
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LogPrint (eLogError, "Garlic message length ", length, " is less than 32 bytes");
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m_Tags.erase (it); // tag might be used only once
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}
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else
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{
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// tag not found. Use ElGamal
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ElGamalBlock elGamal;
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if (length >= 514 && i2p::crypto::ElGamalDecrypt (GetEncryptionPrivateKey (), buf, (uint8_t *)&elGamal, true))
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{
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auto decryption = std::make_shared<i2p::crypto::CBCDecryption>();
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decryption->SetKey (elGamal.sessionKey);
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uint8_t iv[32]; // IV is first 16 bytes
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CryptoPP::SHA256().CalculateDigest(iv, elGamal.preIV, 32);
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decryption->SetIV (iv);
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decryption->Decrypt(buf + 514, length - 514, buf + 514);
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HandleAESBlock (buf + 514, length - 514, decryption, msg->from);
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}
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else
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LogPrint (eLogError, "Failed to decrypt garlic");
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}
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// cleanup expired tags
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uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
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if (ts > m_LastTagsCleanupTime + INCOMING_TAGS_EXPIRATION_TIMEOUT)
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{
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if (m_LastTagsCleanupTime)
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{
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int numExpiredTags = 0;
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for (auto it = m_Tags.begin (); it != m_Tags.end ();)
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{
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if (ts > it->first.creationTime + INCOMING_TAGS_EXPIRATION_TIMEOUT)
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{
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numExpiredTags++;
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it = m_Tags.erase (it);
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}
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else
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it++;
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}
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LogPrint (numExpiredTags, " tags expired for ", GetIdentHash().ToBase64 ());
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}
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m_LastTagsCleanupTime = ts;
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}
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}
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void GarlicDestination::HandleAESBlock (uint8_t * buf, size_t len, std::shared_ptr<i2p::crypto::CBCDecryption> decryption,
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std::shared_ptr<i2p::tunnel::InboundTunnel> from)
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{
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uint16_t tagCount = bufbe16toh (buf);
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buf += 2; len -= 2;
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if (tagCount > 0)
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{
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if (tagCount*32 > len)
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{
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LogPrint (eLogError, "Tag count ", tagCount, " exceeds length ", len);
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return ;
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}
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uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
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for (int i = 0; i < tagCount; i++)
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m_Tags[SessionTag(buf + i*32, ts)] = decryption;
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}
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buf += tagCount*32;
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len -= tagCount*32;
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uint32_t payloadSize = bufbe32toh (buf);
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if (payloadSize > len)
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{
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LogPrint (eLogError, "Unexpected payload size ", payloadSize);
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return;
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}
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buf += 4;
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uint8_t * payloadHash = buf;
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buf += 32;// payload hash.
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if (*buf) // session key?
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buf += 32; // new session key
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buf++; // flag
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// payload
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if (!CryptoPP::SHA256().VerifyDigest (payloadHash, buf, payloadSize)) // payload hash doesn't match
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{
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LogPrint ("Wrong payload hash");
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return;
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}
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HandleGarlicPayload (buf, payloadSize, from);
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}
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void GarlicDestination::HandleGarlicPayload (uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from)
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{
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const uint8_t * buf1 = buf;
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int numCloves = buf[0];
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LogPrint (numCloves," cloves");
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buf++;
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for (int i = 0; i < numCloves; i++)
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{
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// delivery instructions
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uint8_t flag = buf[0];
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buf++; // flag
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if (flag & 0x80) // encrypted?
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{
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// TODO: implement
|
|
LogPrint ("Clove encrypted");
|
|
buf += 32;
|
|
}
|
|
GarlicDeliveryType deliveryType = (GarlicDeliveryType)((flag >> 5) & 0x03);
|
|
switch (deliveryType)
|
|
{
|
|
case eGarlicDeliveryTypeLocal:
|
|
LogPrint ("Garlic type local");
|
|
HandleI2NPMessage (buf, len, from);
|
|
break;
|
|
case eGarlicDeliveryTypeDestination:
|
|
LogPrint ("Garlic type destination");
|
|
buf += 32; // destination. check it later or for multiple destinations
|
|
HandleI2NPMessage (buf, len, from);
|
|
break;
|
|
case eGarlicDeliveryTypeTunnel:
|
|
{
|
|
LogPrint ("Garlic type tunnel");
|
|
// gwHash and gwTunnel sequence is reverted
|
|
uint8_t * gwHash = buf;
|
|
buf += 32;
|
|
uint32_t gwTunnel = bufbe32toh (buf);
|
|
buf += 4;
|
|
std::shared_ptr<i2p::tunnel::OutboundTunnel> tunnel;
|
|
if (from && from->GetTunnelPool ())
|
|
tunnel = from->GetTunnelPool ()->GetNextOutboundTunnel ();
|
|
if (tunnel) // we have send it through an outbound tunnel
|
|
{
|
|
auto msg = CreateI2NPMessage (buf, GetI2NPMessageLength (buf), from);
|
|
tunnel->SendTunnelDataMsg (gwHash, gwTunnel, msg);
|
|
}
|
|
else
|
|
LogPrint ("No outbound tunnels available for garlic clove");
|
|
break;
|
|
}
|
|
case eGarlicDeliveryTypeRouter:
|
|
LogPrint ("Garlic type router not supported");
|
|
buf += 32;
|
|
break;
|
|
default:
|
|
LogPrint ("Unknow garlic delivery type ", (int)deliveryType);
|
|
}
|
|
buf += GetI2NPMessageLength (buf); // I2NP
|
|
buf += 4; // CloveID
|
|
buf += 8; // Date
|
|
buf += 3; // Certificate
|
|
if (buf - buf1 > (int)len)
|
|
{
|
|
LogPrint (eLogError, "Garlic clove is too long");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> GarlicDestination::WrapMessage (std::shared_ptr<const i2p::data::RoutingDestination> destination,
|
|
std::shared_ptr<I2NPMessage> msg, bool attachLeaseSet)
|
|
{
|
|
auto session = GetRoutingSession (destination, attachLeaseSet); // 32 tags by default
|
|
return session->WrapSingleMessage (msg);
|
|
}
|
|
|
|
std::shared_ptr<GarlicRoutingSession> GarlicDestination::GetRoutingSession (
|
|
std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet)
|
|
{
|
|
auto it = m_Sessions.find (destination->GetIdentHash ());
|
|
std::shared_ptr<GarlicRoutingSession> session;
|
|
if (it != m_Sessions.end ())
|
|
session = it->second;
|
|
if (!session)
|
|
{
|
|
session = std::make_shared<GarlicRoutingSession> (this, destination,
|
|
attachLeaseSet ? 40 : 4, attachLeaseSet); // 40 tags for connections and 4 for LS requests
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
m_Sessions[destination->GetIdentHash ()] = session;
|
|
}
|
|
return session;
|
|
}
|
|
|
|
void GarlicDestination::CleanupRoutingSessions ()
|
|
{
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
for (auto it = m_Sessions.begin (); it != m_Sessions.end ();)
|
|
{
|
|
if (!it->second->CleanupExpiredTags ())
|
|
{
|
|
LogPrint (eLogInfo, "Routing session to ", it->first.ToBase32 (), " deleted");
|
|
it = m_Sessions.erase (it);
|
|
}
|
|
else
|
|
it++;
|
|
}
|
|
}
|
|
|
|
void GarlicDestination::RemoveCreatedSession (uint32_t msgID)
|
|
{
|
|
m_CreatedSessions.erase (msgID);
|
|
}
|
|
|
|
void GarlicDestination::DeliveryStatusSent (std::shared_ptr<GarlicRoutingSession> session, uint32_t msgID)
|
|
{
|
|
m_CreatedSessions[msgID] = session;
|
|
}
|
|
|
|
void GarlicDestination::HandleDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
uint32_t msgID = bufbe32toh (msg->GetPayload ());
|
|
{
|
|
auto it = m_CreatedSessions.find (msgID);
|
|
if (it != m_CreatedSessions.end ())
|
|
{
|
|
it->second->MessageConfirmed (msgID);
|
|
m_CreatedSessions.erase (it);
|
|
LogPrint (eLogInfo, "Garlic message ", msgID, " acknowledged");
|
|
}
|
|
}
|
|
}
|
|
|
|
void GarlicDestination::SetLeaseSetUpdated ()
|
|
{
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
for (auto it: m_Sessions)
|
|
it.second->SetLeaseSetUpdated ();
|
|
}
|
|
|
|
void GarlicDestination::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
HandleGarlicMessage (msg);
|
|
}
|
|
|
|
void GarlicDestination::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
HandleDeliveryStatusMessage (msg);
|
|
}
|
|
|
|
}
|
|
}
|