mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2025-04-30 12:47:48 +02:00
1014 lines
46 KiB
C++
1014 lines
46 KiB
C++
/*
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* Copyright (c) 2013-2022, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#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 "Crypto.h"
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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 "Transports.h"
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#include "Timestamp.h"
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#include "Log.h"
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#include "FS.h"
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#include "ECIESX25519AEADRatchetSession.h"
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#include "Garlic.h"
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namespace i2p {
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namespace garlic {
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GarlicRoutingSession::GarlicRoutingSession(GarlicDestination *owner, bool attachLeaseSet) :
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m_Owner(owner), m_LeaseSetUpdateStatus(attachLeaseSet ? eLeaseSetUpdated : eLeaseSetDoNotSend),
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m_LeaseSetUpdateMsgID(0) {
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}
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GarlicRoutingSession::GarlicRoutingSession() :
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m_Owner(nullptr), m_LeaseSetUpdateStatus(eLeaseSetDoNotSend), m_LeaseSetUpdateMsgID(0) {
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}
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GarlicRoutingSession::~GarlicRoutingSession() {
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}
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std::shared_ptr<GarlicRoutingPath> GarlicRoutingSession::GetSharedRoutingPath() {
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if (!m_SharedRoutingPath) return nullptr;
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uint32_t ts = i2p::util::GetSecondsSinceEpoch();
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if (m_SharedRoutingPath->numTimesUsed >= ROUTING_PATH_MAX_NUM_TIMES_USED ||
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!m_SharedRoutingPath->outboundTunnel->IsEstablished() ||
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ts * 1000LL > m_SharedRoutingPath->remoteLease->endDate ||
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ts > m_SharedRoutingPath->updateTime + ROUTING_PATH_EXPIRATION_TIMEOUT)
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m_SharedRoutingPath = nullptr;
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if (m_SharedRoutingPath) m_SharedRoutingPath->numTimesUsed++;
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return m_SharedRoutingPath;
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}
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void GarlicRoutingSession::SetSharedRoutingPath(std::shared_ptr<GarlicRoutingPath> path) {
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if (path && path->outboundTunnel && path->remoteLease) {
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path->updateTime = i2p::util::GetSecondsSinceEpoch();
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path->numTimesUsed = 0;
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} else
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path = nullptr;
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m_SharedRoutingPath = path;
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}
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bool GarlicRoutingSession::MessageConfirmed(uint32_t msgID) {
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if (msgID == GetLeaseSetUpdateMsgID()) {
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SetLeaseSetUpdateStatus(eLeaseSetUpToDate);
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SetLeaseSetUpdateMsgID(0);
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LogPrint(eLogInfo, "Garlic: LeaseSet update confirmed");
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return true;
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}
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return false;
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}
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void GarlicRoutingSession::CleanupUnconfirmedLeaseSet(uint64_t ts) {
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if (m_LeaseSetUpdateMsgID && ts * 1000LL > m_LeaseSetSubmissionTime + LEASET_CONFIRMATION_TIMEOUT) {
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if (GetOwner())
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GetOwner()->RemoveDeliveryStatusSession(m_LeaseSetUpdateMsgID);
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m_LeaseSetUpdateMsgID = 0;
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}
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}
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std::shared_ptr<I2NPMessage> GarlicRoutingSession::CreateEncryptedDeliveryStatusMsg(uint32_t msgID) {
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auto msg = CreateDeliveryStatusMsg(msgID);
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if (GetOwner()) {
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//encrypt
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uint8_t key[32], tag[32];
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RAND_bytes(key, 32); // random session key
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RAND_bytes(tag, 32); // random session tag
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GetOwner()->SubmitSessionKey(key, tag);
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ElGamalAESSession garlic(key, tag);
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msg = garlic.WrapSingleMessage(msg);
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}
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return msg;
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}
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ElGamalAESSession::ElGamalAESSession(GarlicDestination *owner,
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std::shared_ptr<const i2p::data::RoutingDestination> destination,
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int numTags, bool attachLeaseSet) :
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GarlicRoutingSession(owner, attachLeaseSet),
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m_Destination(destination), m_NumTags(numTags) {
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// create new session tags and session key
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RAND_bytes(m_SessionKey, 32);
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m_Encryption.SetKey(m_SessionKey);
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}
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ElGamalAESSession::ElGamalAESSession(const uint8_t *sessionKey, const SessionTag &sessionTag) :
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m_NumTags(1) {
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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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std::shared_ptr<I2NPMessage> ElGamalAESSession::WrapSingleMessage(std::shared_ptr<const I2NPMessage> msg) {
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auto m = 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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uint32_t ts = i2p::util::GetSecondsSinceEpoch();
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while (!m_SessionTags.empty()) {
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if (ts < m_SessionTags.front().creationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT) {
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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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} 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(eLogInfo, "Garlic: No tags available, will use ElGamal");
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if (!m_Destination) {
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LogPrint(eLogError, "Garlic: 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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RAND_bytes(elGamal.preIV, 32); // Pre-IV
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uint8_t iv[32]; // IV is first 16 bytes
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SHA256(elGamal.preIV, 32, iv);
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m_Destination->Encrypt((uint8_t * ) & elGamal, buf);
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m_Encryption.SetIV(iv);
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buf += 514;
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len += 514;
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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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SHA256(tag, 32, iv);
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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);
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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 ElGamalAESSession::CreateAESBlock(uint8_t *buf, std::shared_ptr<const I2NPMessage> msg) {
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size_t blockSize = 0;
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bool createNewTags = GetOwner() && 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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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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SHA256(buf + blockSize, len, payloadHash);
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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 ElGamalAESSession::CreateGarlicPayload(uint8_t *payload, std::shared_ptr<const I2NPMessage> msg,
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UnconfirmedTags *newTags) {
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch();
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uint32_t msgID;
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RAND_bytes((uint8_t * ) & msgID, 4);
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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 (GetOwner()) {
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// resubmit non-confirmed LeaseSet
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if (GetLeaseSetUpdateStatus() == eLeaseSetSubmitted &&
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ts > GetLeaseSetSubmissionTime() + LEASET_CONFIRMATION_TIMEOUT) {
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SetLeaseSetUpdateStatus(eLeaseSetUpdated);
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SetSharedRoutingPath(nullptr); // invalidate path since leaseset was not confirmed
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}
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// attach DeviveryStatus if necessary
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if (newTags || GetLeaseSetUpdateStatus() == 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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{
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newTags->msgID = msgID;
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m_UnconfirmedTagsMsgs.insert(
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std::make_pair(msgID, std::unique_ptr<UnconfirmedTags>(newTags)));
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newTags = nullptr; // got acquired
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}
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GetOwner()->DeliveryStatusSent(shared_from_this(), msgID);
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} else
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LogPrint(eLogWarning, "Garlic: DeliveryStatus clove was not created");
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}
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// attach LeaseSet
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if (GetLeaseSetUpdateStatus() == eLeaseSetUpdated) {
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if (GetLeaseSetUpdateMsgID())
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GetOwner()->RemoveDeliveryStatusSession(GetLeaseSetUpdateMsgID()); // remove previous
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SetLeaseSetUpdateStatus(eLeaseSetSubmitted);
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SetLeaseSetUpdateMsgID(msgID);
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SetLeaseSetSubmissionTime(ts);
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// clove if our leaseSet must be attached
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auto leaseSet = CreateDatabaseStoreMsg(GetOwner()->GetLeaseSet());
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size += CreateGarlicClove(payload + size, leaseSet, false);
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(*numCloves)++;
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}
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}
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if (msg) // clove message itself 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 + 8000); // Expiration of message, 8 sec
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size += 8;
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if (newTags) delete newTags; // not acquired, delete
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return size;
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}
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size_t
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ElGamalAESSession::CreateGarlicClove(uint8_t *buf, std::shared_ptr<const I2NPMessage> msg, bool isDestination) {
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch() + 8000; // 8 sec
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size_t size = 0;
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if (isDestination) {
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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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} else {
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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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uint32_t cloveID;
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RAND_bytes((uint8_t * ) & cloveID, 4);
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htobe32buf(buf + size, cloveID); // 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 ElGamalAESSession::CreateDeliveryStatusClove(uint8_t *buf, uint32_t msgID) {
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size_t size = 0;
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if (GetOwner()) {
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auto inboundTunnel = GetOwner()->GetTunnelPool()->GetNextInboundTunnel();
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if (inboundTunnel) {
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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 = CreateEncryptedDeliveryStatusMsg(msgID);
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if (msg) {
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memcpy(buf + size, msg->GetBuffer(), msg->GetLength());
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size += msg->GetLength();
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}
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// fill clove
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch() + 8000; // 8 sec
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uint32_t cloveID;
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RAND_bytes((uint8_t * ) & cloveID, 4);
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htobe32buf(buf + size, cloveID); // 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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} else
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LogPrint(eLogError, "Garlic: No inbound tunnels in the pool for DeliveryStatus");
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} else
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LogPrint(eLogWarning, "Garlic: Missing local LeaseSet");
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return size;
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}
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ElGamalAESSession::UnconfirmedTags *ElGamalAESSession::GenerateSessionTags() {
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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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RAND_bytes(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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bool ElGamalAESSession::MessageConfirmed(uint32_t msgID) {
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TagsConfirmed(msgID);
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if (!GarlicRoutingSession::MessageConfirmed(msgID))
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CleanupExpiredTags();
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return true;
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}
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void ElGamalAESSession::TagsConfirmed(uint32_t msgID) {
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uint32_t ts = i2p::util::GetSecondsSinceEpoch();
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auto it = m_UnconfirmedTagsMsgs.find(msgID);
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if (it != m_UnconfirmedTagsMsgs.end()) {
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auto &tags = it->second;
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if (ts < tags->tagsCreationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT) {
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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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}
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}
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bool ElGamalAESSession::CleanupExpiredTags() {
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auto ts = i2p::util::GetSecondsSinceEpoch();
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for (auto it = m_SessionTags.begin(); it != m_SessionTags.end();) {
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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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CleanupUnconfirmedTags();
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CleanupUnconfirmedLeaseSet(ts);
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return !m_SessionTags.empty() || !m_UnconfirmedTagsMsgs.empty();
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}
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bool ElGamalAESSession::CleanupUnconfirmedTags() {
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bool ret = false;
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uint32_t ts = i2p::util::GetSecondsSinceEpoch();
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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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if (ts >= it->second->tagsCreationTime + OUTGOING_TAGS_CONFIRMATION_TIMEOUT) {
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if (GetOwner())
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GetOwner()->RemoveDeliveryStatusSession(it->first);
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it = m_UnconfirmedTagsMsgs.erase(it);
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ret = true;
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} else
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++it;
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}
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return ret;
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}
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GarlicDestination::GarlicDestination() : m_NumTags(32), // 32 tags by default
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m_PayloadBuffer(nullptr),
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m_NumRatchetInboundTags(0) // 0 means standard
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{
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}
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GarlicDestination::~GarlicDestination() {
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if (m_PayloadBuffer)
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delete[] m_PayloadBuffer;
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}
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void GarlicDestination::CleanUp() {
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for (auto it: m_Sessions)
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it.second->SetOwner(nullptr);
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m_Sessions.clear();
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m_DeliveryStatusSessions.clear();
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m_Tags.clear();
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for (auto it: m_ECIESx25519Sessions) {
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it.second->Terminate();
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it.second->SetOwner(nullptr);
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}
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m_ECIESx25519Sessions.clear();
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m_ECIESx25519Tags.clear();
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}
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void GarlicDestination::AddSessionKey(const uint8_t *key, const uint8_t *tag) {
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if (key) {
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uint32_t ts = i2p::util::GetSecondsSinceEpoch();
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m_Tags[SessionTag(tag, ts)] = std::make_shared<AESDecryption>(key);
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}
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}
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void GarlicDestination::AddECIESx25519Key(const uint8_t *key, const uint8_t *tag) {
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uint64_t t;
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memcpy(&t, tag, 8);
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AddECIESx25519Key(key, t);
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}
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void GarlicDestination::AddECIESx25519Key(const uint8_t *key, uint64_t tag) {
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auto tagset = std::make_shared<SymmetricKeyTagSet>(this, key);
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m_ECIESx25519Tags.emplace(tag, ECIESX25519AEADRatchetIndexTagset{0, tagset});
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}
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bool GarlicDestination::SubmitSessionKey(const uint8_t *key, const uint8_t *tag) {
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AddSessionKey(key, tag);
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return true;
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}
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void GarlicDestination::SubmitECIESx25519Key(const uint8_t *key, uint64_t tag) {
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AddECIESx25519Key(key, tag);
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}
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void GarlicDestination::HandleGarlicMessage(std::shared_ptr<I2NPMessage> msg) {
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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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LogPrint(eLogWarning, "Garlic: Message length ", length, " exceeds I2NP message length ",
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msg->GetLength());
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return;
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}
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auto mod = length & 0x0f; // %16
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buf += 4; // length
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bool found = false;
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if (SupportsEncryptionType(i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
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// try ECIESx25519 tag
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found = HandleECIESx25519TagMessage(buf, length);
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if (!found) {
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auto it = !mod ? m_Tags.find(SessionTag(buf)) : m_Tags.end(); // AES block is multiple of 16
|
|
// AES tag might be used even if encryption type is not ElGamal/AES
|
|
if (it != m_Tags.end()) // try AES tag
|
|
{
|
|
// tag found. Use AES
|
|
auto decryption = it->second;
|
|
m_Tags.erase(it); // tag might be used only once
|
|
if (length >= 32) {
|
|
uint8_t iv[32]; // IV is first 16 bytes
|
|
SHA256(buf, 32, iv);
|
|
decryption->SetIV(iv);
|
|
decryption->Decrypt(buf + 32, length - 32, buf + 32);
|
|
HandleAESBlock(buf + 32, length - 32, decryption, msg->from);
|
|
found = true;
|
|
} else
|
|
LogPrint(eLogWarning, "Garlic: Message length ", length, " is less than 32 bytes");
|
|
}
|
|
if (!found) // assume new session
|
|
{
|
|
// AES tag not found. Handle depending on encryption type
|
|
// try ElGamal/AES first if leading block is 514
|
|
ElGamalBlock elGamal;
|
|
if (mod == 2 && length >= 514 && SupportsEncryptionType(i2p::data::CRYPTO_KEY_TYPE_ELGAMAL) &&
|
|
Decrypt(buf, (uint8_t * ) & elGamal, i2p::data::CRYPTO_KEY_TYPE_ELGAMAL)) {
|
|
auto decryption = std::make_shared<AESDecryption>(elGamal.sessionKey);
|
|
uint8_t iv[32]; // IV is first 16 bytes
|
|
SHA256(elGamal.preIV, 32, iv);
|
|
decryption->SetIV(iv);
|
|
decryption->Decrypt(buf + 514, length - 514, buf + 514);
|
|
HandleAESBlock(buf + 514, length - 514, decryption, msg->from);
|
|
} else if (SupportsEncryptionType(i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) {
|
|
// otherwise ECIESx25519
|
|
auto session = std::make_shared<ECIESX25519AEADRatchetSession>(this, false); // incoming
|
|
if (!session->HandleNextMessage(buf, length, nullptr, 0)) {
|
|
// try to generate more tags for last tagset
|
|
if (m_LastTagset && (m_LastTagset->GetNextIndex() - m_LastTagset->GetTrimBehind() <
|
|
3 * ECIESX25519_MAX_NUM_GENERATED_TAGS)) {
|
|
uint64_t missingTag;
|
|
memcpy(&missingTag, buf, 8);
|
|
auto maxTags = std::max(m_NumRatchetInboundTags, ECIESX25519_MAX_NUM_GENERATED_TAGS);
|
|
LogPrint(eLogWarning, "Garlic: Trying to generate more ECIES-X25519-AEAD-Ratchet tags");
|
|
for (int i = 0; i < maxTags; i++) {
|
|
auto nextTag = AddECIESx25519SessionNextTag(m_LastTagset);
|
|
if (!nextTag) {
|
|
LogPrint(eLogError,
|
|
"Garlic: Can't create new ECIES-X25519-AEAD-Ratchet tag for last tagset");
|
|
break;
|
|
}
|
|
if (nextTag == missingTag) {
|
|
LogPrint(eLogDebug,
|
|
"Garlic: Missing ECIES-X25519-AEAD-Ratchet tag was generated");
|
|
if (m_LastTagset->HandleNextMessage(buf, length,
|
|
m_ECIESx25519Tags[nextTag].index))
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) m_LastTagset = nullptr;
|
|
}
|
|
if (!found)
|
|
LogPrint(eLogError, "Garlic: Can't handle ECIES-X25519-AEAD-Ratchet message");
|
|
}
|
|
} else
|
|
LogPrint(eLogError, "Garlic: Failed to decrypt message");
|
|
}
|
|
}
|
|
}
|
|
|
|
bool GarlicDestination::HandleECIESx25519TagMessage(uint8_t *buf, size_t len) {
|
|
uint64_t tag;
|
|
memcpy(&tag, buf, 8);
|
|
auto it = m_ECIESx25519Tags.find(tag);
|
|
if (it != m_ECIESx25519Tags.end()) {
|
|
if (it->second.tagset->HandleNextMessage(buf, len, it->second.index))
|
|
m_LastTagset = it->second.tagset;
|
|
else
|
|
LogPrint(eLogError, "Garlic: Can't handle ECIES-X25519-AEAD-Ratchet message");
|
|
m_ECIESx25519Tags.erase(it);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void GarlicDestination::HandleAESBlock(uint8_t *buf, size_t len, std::shared_ptr<AESDecryption> decryption,
|
|
std::shared_ptr<i2p::tunnel::InboundTunnel> from) {
|
|
uint16_t tagCount = bufbe16toh(buf);
|
|
buf += 2;
|
|
len -= 2;
|
|
if (tagCount > 0) {
|
|
if (tagCount * 32 > len) {
|
|
LogPrint(eLogError, "Garlic: Tag count ", tagCount, " exceeds length ", len);
|
|
return;
|
|
}
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch();
|
|
for (int i = 0; i < tagCount; i++)
|
|
m_Tags[SessionTag(buf + i * 32, ts)] = decryption;
|
|
}
|
|
buf += tagCount * 32;
|
|
len -= tagCount * 32;
|
|
uint32_t payloadSize = bufbe32toh(buf);
|
|
if (payloadSize > len) {
|
|
LogPrint(eLogError, "Garlic: Unexpected payload size ", payloadSize);
|
|
return;
|
|
}
|
|
buf += 4;
|
|
uint8_t *payloadHash = buf;
|
|
buf += 32;// payload hash.
|
|
if (*buf) // session key?
|
|
buf += 32; // new session key
|
|
buf++; // flag
|
|
|
|
// payload
|
|
uint8_t digest[32];
|
|
SHA256(buf, payloadSize, digest);
|
|
if (memcmp(payloadHash, digest, 32)) // payload hash doesn't match
|
|
{
|
|
LogPrint(eLogError, "Garlic: Wrong payload hash");
|
|
return;
|
|
}
|
|
HandleGarlicPayload(buf, payloadSize, from);
|
|
}
|
|
|
|
void GarlicDestination::HandleGarlicPayload(uint8_t *buf, size_t len,
|
|
std::shared_ptr<i2p::tunnel::InboundTunnel> from) {
|
|
if (len < 1) {
|
|
LogPrint(eLogError, "Garlic: Payload is too short");
|
|
return;
|
|
}
|
|
int numCloves = buf[0];
|
|
LogPrint(eLogDebug, "Garlic: ", numCloves, " cloves");
|
|
buf++;
|
|
len--;
|
|
for (int i = 0; i < numCloves; i++) {
|
|
const uint8_t *buf1 = buf;
|
|
// delivery instructions
|
|
uint8_t flag = buf[0];
|
|
buf++; // flag
|
|
if (flag & 0x80) // encrypted?
|
|
{
|
|
// TODO: implement
|
|
LogPrint(eLogWarning, "Garlic: Clove encrypted");
|
|
buf += 32;
|
|
}
|
|
ptrdiff_t offset = buf - buf1;
|
|
GarlicDeliveryType deliveryType = (GarlicDeliveryType) ((flag >> 5) & 0x03);
|
|
switch (deliveryType) {
|
|
case eGarlicDeliveryTypeLocal:
|
|
LogPrint(eLogDebug, "Garlic: Type local");
|
|
if (offset > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Message is too short");
|
|
break;
|
|
}
|
|
HandleI2NPMessage(buf, len - offset);
|
|
break;
|
|
case eGarlicDeliveryTypeDestination:
|
|
LogPrint(eLogDebug, "Garlic: Type destination");
|
|
buf += 32; // destination. check it later or for multiple destinations
|
|
offset = buf - buf1;
|
|
if (offset > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Message is too short");
|
|
break;
|
|
}
|
|
HandleI2NPMessage(buf, len - offset);
|
|
break;
|
|
case eGarlicDeliveryTypeTunnel: {
|
|
LogPrint(eLogDebug, "Garlic: Type tunnel");
|
|
// gwHash and gwTunnel sequence is reverted
|
|
uint8_t *gwHash = buf;
|
|
buf += 32;
|
|
offset = buf - buf1;
|
|
if (offset + 4 > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Message is too short");
|
|
break;
|
|
}
|
|
uint32_t gwTunnel = bufbe32toh(buf);
|
|
buf += 4;
|
|
offset += 4;
|
|
auto msg = CreateI2NPMessage(buf, GetI2NPMessageLength(buf, len - offset), from);
|
|
if (from) // received through an inbound tunnel
|
|
{
|
|
std::shared_ptr<i2p::tunnel::OutboundTunnel> tunnel;
|
|
if (from->GetTunnelPool())
|
|
tunnel = from->GetTunnelPool()->GetNextOutboundTunnel();
|
|
else
|
|
LogPrint(eLogError, "Garlic: Tunnel pool is not set for inbound tunnel");
|
|
if (tunnel) // we have sent it through an outbound tunnel
|
|
tunnel->SendTunnelDataMsg(gwHash, gwTunnel, msg);
|
|
else
|
|
LogPrint(eLogWarning, "Garlic: No outbound tunnels available for garlic clove");
|
|
} else // received directly
|
|
i2p::transport::transports.SendMessage(gwHash, i2p::CreateTunnelGatewayMsg(gwTunnel,
|
|
msg)); // send directly
|
|
break;
|
|
}
|
|
case eGarlicDeliveryTypeRouter: {
|
|
uint8_t *ident = buf;
|
|
buf += 32;
|
|
offset = buf - buf1;
|
|
if (!from) // received directly
|
|
{
|
|
if (offset > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Message is too short");
|
|
break;
|
|
}
|
|
i2p::transport::transports.SendMessage(ident,
|
|
CreateI2NPMessage(buf, GetI2NPMessageLength(buf,
|
|
len -
|
|
offset)));
|
|
} else
|
|
LogPrint(eLogWarning, "Garlic: Type router for inbound tunnels not supported");
|
|
break;
|
|
}
|
|
default:
|
|
LogPrint(eLogWarning, "Garlic: Unknown delivery type ", (int) deliveryType);
|
|
}
|
|
if (offset > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Message is too short");
|
|
break;
|
|
}
|
|
buf += GetI2NPMessageLength(buf, len - offset); // I2NP
|
|
buf += 4; // CloveID
|
|
buf += 8; // Date
|
|
buf += 3; // Certificate
|
|
offset = buf - buf1;
|
|
if (offset > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Clove is too long");
|
|
break;
|
|
}
|
|
len -= offset;
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage>
|
|
GarlicDestination::WrapMessageForRouter(std::shared_ptr<const i2p::data::RouterInfo> router,
|
|
std::shared_ptr<I2NPMessage> msg) {
|
|
if (router->GetEncryptionType() == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
|
|
return WrapECIESX25519MessageForRouter(msg, router->GetIdentity()->GetEncryptionPublicKey());
|
|
else {
|
|
auto session = GetRoutingSession(router, false);
|
|
return session->WrapSingleMessage(msg);
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<GarlicRoutingSession> GarlicDestination::GetRoutingSession(
|
|
std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet) {
|
|
if (destination->GetEncryptionType() == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD &&
|
|
SupportsEncryptionType(i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) {
|
|
ECIESX25519AEADRatchetSessionPtr session;
|
|
uint8_t staticKey[32];
|
|
destination->Encrypt(nullptr, staticKey); // we are supposed to get static key
|
|
auto it = m_ECIESx25519Sessions.find(staticKey);
|
|
if (it != m_ECIESx25519Sessions.end()) {
|
|
session = it->second;
|
|
if (session->IsInactive(i2p::util::GetSecondsSinceEpoch())) {
|
|
LogPrint(eLogDebug, "Garlic: Session restarted");
|
|
session = nullptr;
|
|
}
|
|
}
|
|
if (!session) {
|
|
session = std::make_shared<ECIESX25519AEADRatchetSession>(this, true);
|
|
session->SetRemoteStaticKey(staticKey);
|
|
}
|
|
if (destination->IsDestination())
|
|
session->SetDestination(destination->GetIdentHash()); // TODO: remove
|
|
return session;
|
|
} else {
|
|
ElGamalAESSessionPtr session;
|
|
{
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
auto it = m_Sessions.find(destination->GetIdentHash());
|
|
if (it != m_Sessions.end())
|
|
session = it->second;
|
|
}
|
|
if (!session) {
|
|
session = std::make_shared<ElGamalAESSession>(this, destination,
|
|
attachLeaseSet ? m_NumTags : 4,
|
|
attachLeaseSet); // specified num tags for connections and 4 for LS requests
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
m_Sessions[destination->GetIdentHash()] = session;
|
|
}
|
|
return session;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
void GarlicDestination::CleanupExpiredTags() {
|
|
// incoming
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch();
|
|
int numExpiredTags = 0;
|
|
for (auto it = m_Tags.begin(); it != m_Tags.end();) {
|
|
if (ts > it->first.creationTime + INCOMING_TAGS_EXPIRATION_TIMEOUT) {
|
|
numExpiredTags++;
|
|
it = m_Tags.erase(it);
|
|
} else
|
|
++it;
|
|
}
|
|
if (numExpiredTags > 0)
|
|
LogPrint(eLogDebug, "Garlic: ", numExpiredTags, " tags expired for ", GetIdentHash().ToBase64());
|
|
|
|
// outgoing
|
|
{
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
for (auto it = m_Sessions.begin(); it != m_Sessions.end();) {
|
|
it->second->GetSharedRoutingPath(); // delete shared path if necessary
|
|
if (!it->second->CleanupExpiredTags()) {
|
|
LogPrint(eLogInfo, "Garlic: Routing session to ", it->first.ToBase32(), " deleted");
|
|
it->second->SetOwner(nullptr);
|
|
it = m_Sessions.erase(it);
|
|
} else
|
|
++it;
|
|
}
|
|
}
|
|
// delivery status sessions
|
|
{
|
|
std::unique_lock<std::mutex> l(m_DeliveryStatusSessionsMutex);
|
|
for (auto it = m_DeliveryStatusSessions.begin(); it != m_DeliveryStatusSessions.end();) {
|
|
if (it->second->GetOwner() != this)
|
|
it = m_DeliveryStatusSessions.erase(it);
|
|
else
|
|
++it;
|
|
}
|
|
}
|
|
// ECIESx25519
|
|
for (auto it = m_ECIESx25519Sessions.begin(); it != m_ECIESx25519Sessions.end();) {
|
|
if (it->second->CheckExpired(ts)) {
|
|
it->second->Terminate();
|
|
it = m_ECIESx25519Sessions.erase(it);
|
|
} else
|
|
++it;
|
|
}
|
|
|
|
numExpiredTags = 0;
|
|
for (auto it = m_ECIESx25519Tags.begin(); it != m_ECIESx25519Tags.end();) {
|
|
if (it->second.tagset->IsExpired(ts) || it->second.tagset->IsIndexExpired(it->second.index)) {
|
|
it->second.tagset->DeleteSymmKey(it->second.index);
|
|
it = m_ECIESx25519Tags.erase(it);
|
|
numExpiredTags++;
|
|
} else {
|
|
auto session = it->second.tagset->GetSession();
|
|
if (!session || session->IsTerminated()) {
|
|
it = m_ECIESx25519Tags.erase(it);
|
|
numExpiredTags++;
|
|
} else
|
|
++it;
|
|
}
|
|
}
|
|
if (numExpiredTags > 0)
|
|
LogPrint(eLogDebug, "Garlic: ", numExpiredTags, " ECIESx25519 tags expired for ",
|
|
GetIdentHash().ToBase64());
|
|
if (m_LastTagset && m_LastTagset->IsExpired(ts))
|
|
m_LastTagset = nullptr;
|
|
}
|
|
|
|
void GarlicDestination::RemoveDeliveryStatusSession(uint32_t msgID) {
|
|
std::unique_lock<std::mutex> l(m_DeliveryStatusSessionsMutex);
|
|
m_DeliveryStatusSessions.erase(msgID);
|
|
}
|
|
|
|
void GarlicDestination::DeliveryStatusSent(GarlicRoutingSessionPtr session, uint32_t msgID) {
|
|
std::unique_lock<std::mutex> l(m_DeliveryStatusSessionsMutex);
|
|
m_DeliveryStatusSessions[msgID] = session;
|
|
}
|
|
|
|
void GarlicDestination::HandleDeliveryStatusMessage(uint32_t msgID) {
|
|
GarlicRoutingSessionPtr session;
|
|
{
|
|
std::unique_lock<std::mutex> l(m_DeliveryStatusSessionsMutex);
|
|
auto it = m_DeliveryStatusSessions.find(msgID);
|
|
if (it != m_DeliveryStatusSessions.end()) {
|
|
session = it->second;
|
|
m_DeliveryStatusSessions.erase(it);
|
|
}
|
|
}
|
|
if (session) {
|
|
session->MessageConfirmed(msgID);
|
|
LogPrint(eLogDebug, "Garlic: Message ", msgID, " acknowledged");
|
|
}
|
|
}
|
|
|
|
void GarlicDestination::SetLeaseSetUpdated() {
|
|
{
|
|
std::unique_lock<std::mutex> l(m_SessionsMutex);
|
|
for (auto &it: m_Sessions)
|
|
it.second->SetLeaseSetUpdated();
|
|
}
|
|
for (auto &it: m_ECIESx25519Sessions)
|
|
it.second->SetLeaseSetUpdated();
|
|
}
|
|
|
|
void GarlicDestination::ProcessGarlicMessage(std::shared_ptr<I2NPMessage> msg) {
|
|
HandleGarlicMessage(msg);
|
|
}
|
|
|
|
void GarlicDestination::ProcessDeliveryStatusMessage(std::shared_ptr<I2NPMessage> msg) {
|
|
uint32_t msgID = bufbe32toh(msg->GetPayload() + DELIVERY_STATUS_MSGID_OFFSET);
|
|
HandleDeliveryStatusMessage(msgID);
|
|
}
|
|
|
|
void GarlicDestination::SaveTags() {
|
|
if (m_Tags.empty()) return;
|
|
std::string ident = GetIdentHash().ToBase32();
|
|
std::string path = i2p::fs::DataDirPath("tags", (ident + ".tags"));
|
|
std::ofstream f(path, std::ofstream::binary | std::ofstream::out | std::ofstream::trunc);
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch();
|
|
// 4 bytes timestamp, 32 bytes tag, 32 bytes key
|
|
for (auto it: m_Tags) {
|
|
if (ts < it.first.creationTime + INCOMING_TAGS_EXPIRATION_TIMEOUT) {
|
|
f.write((char *) &it.first.creationTime, 4);
|
|
f.write((char *) it.first.data(), 32);
|
|
f.write((char *) it.second->GetKey().data(), 32);
|
|
}
|
|
}
|
|
}
|
|
|
|
void GarlicDestination::LoadTags() {
|
|
std::string ident = GetIdentHash().ToBase32();
|
|
std::string path = i2p::fs::DataDirPath("tags", (ident + ".tags"));
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch();
|
|
if (ts < i2p::fs::GetLastUpdateTime(path) + INCOMING_TAGS_EXPIRATION_TIMEOUT) {
|
|
// might contain non-expired tags
|
|
std::ifstream f(path, std::ifstream::binary);
|
|
if (f) {
|
|
std::map<i2p::crypto::AESKey, std::shared_ptr<AESDecryption> > keys;
|
|
// 4 bytes timestamp, 32 bytes tag, 32 bytes key
|
|
while (!f.eof()) {
|
|
uint32_t t;
|
|
uint8_t tag[32], key[32];
|
|
f.read((char *) &t, 4);
|
|
if (f.eof()) break;
|
|
if (ts < t + INCOMING_TAGS_EXPIRATION_TIMEOUT) {
|
|
f.read((char *) tag, 32);
|
|
f.read((char *) key, 32);
|
|
} else
|
|
f.seekg(64, std::ios::cur); // skip
|
|
if (f.eof()) break;
|
|
|
|
std::shared_ptr<AESDecryption> decryption;
|
|
auto it = keys.find(key);
|
|
if (it != keys.end())
|
|
decryption = it->second;
|
|
else
|
|
decryption = std::make_shared<AESDecryption>(key);
|
|
m_Tags.insert(std::make_pair(SessionTag(tag, ts), decryption));
|
|
}
|
|
if (!m_Tags.empty())
|
|
LogPrint(eLogInfo, "Garlic: ", m_Tags.size(), " tags loaded for ", ident);
|
|
}
|
|
}
|
|
i2p::fs::Remove(path);
|
|
}
|
|
|
|
void CleanUpTagsFiles() {
|
|
std::vector<std::string> files;
|
|
i2p::fs::ReadDir(i2p::fs::DataDirPath("tags"), files);
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch();
|
|
for (auto it: files)
|
|
if (ts >= i2p::fs::GetLastUpdateTime(it) + INCOMING_TAGS_EXPIRATION_TIMEOUT)
|
|
i2p::fs::Remove(it);
|
|
}
|
|
|
|
void GarlicDestination::HandleECIESx25519GarlicClove(const uint8_t *buf, size_t len) {
|
|
const uint8_t *buf1 = buf;
|
|
uint8_t flag = buf[0];
|
|
buf++; // flag
|
|
GarlicDeliveryType deliveryType = (GarlicDeliveryType) ((flag >> 5) & 0x03);
|
|
switch (deliveryType) {
|
|
case eGarlicDeliveryTypeDestination:
|
|
LogPrint(eLogDebug, "Garlic: Type destination");
|
|
buf += 32; // TODO: check destination
|
|
#if (__cplusplus >= 201703L) // C++ 17 or higher
|
|
[[fallthrough]];
|
|
#endif
|
|
// no break here
|
|
case eGarlicDeliveryTypeLocal: {
|
|
LogPrint(eLogDebug, "Garlic: Type local");
|
|
I2NPMessageType typeID = (I2NPMessageType) (buf[0]);
|
|
buf++; // typeid
|
|
int32_t msgID = bufbe32toh(buf);
|
|
buf += 4; // msgID
|
|
buf += 4; // expiration
|
|
ptrdiff_t offset = buf - buf1;
|
|
if (offset <= (int) len)
|
|
HandleCloveI2NPMessage(typeID, buf, len - offset, msgID);
|
|
else
|
|
LogPrint(eLogError, "Garlic: Clove is too long");
|
|
break;
|
|
}
|
|
case eGarlicDeliveryTypeTunnel: {
|
|
LogPrint(eLogDebug, "Garlic: Type tunnel");
|
|
// gwHash and gwTunnel sequence is reverted
|
|
const uint8_t *gwHash = buf;
|
|
buf += 32;
|
|
ptrdiff_t offset = buf - buf1;
|
|
if (offset + 13 > (int) len) {
|
|
LogPrint(eLogError, "Garlic: Message is too short");
|
|
break;
|
|
}
|
|
uint32_t gwTunnel = bufbe32toh(buf);
|
|
buf += 4;
|
|
I2NPMessageType typeID = (I2NPMessageType) (buf[0]);
|
|
buf++; // typeid
|
|
uint32_t msgID = bufbe32toh(buf);
|
|
buf += 4; // msgID
|
|
buf += 4; // expiration
|
|
offset += 13;
|
|
if (GetTunnelPool()) {
|
|
auto tunnel = GetTunnelPool()->GetNextOutboundTunnel();
|
|
if (tunnel)
|
|
tunnel->SendTunnelDataMsg(gwHash, gwTunnel,
|
|
CreateI2NPMessage(typeID, buf, len - offset, msgID));
|
|
else
|
|
LogPrint(eLogWarning, "Garlic: No outbound tunnels available for garlic clove");
|
|
} else
|
|
LogPrint(eLogError, "Garlic: Tunnel pool is not set for inbound tunnel");
|
|
break;
|
|
}
|
|
default:
|
|
LogPrint(eLogWarning, "Garlic: Unexpected delivery type ", (int) deliveryType);
|
|
}
|
|
}
|
|
|
|
uint64_t GarlicDestination::AddECIESx25519SessionNextTag(ReceiveRatchetTagSetPtr tagset) {
|
|
auto index = tagset->GetNextIndex();
|
|
uint64_t tag = tagset->GetNextSessionTag();
|
|
if (tag)
|
|
m_ECIESx25519Tags.emplace(tag, ECIESX25519AEADRatchetIndexTagset{index, tagset});
|
|
return tag;
|
|
}
|
|
|
|
void
|
|
GarlicDestination::AddECIESx25519Session(const uint8_t *staticKey, ECIESX25519AEADRatchetSessionPtr session) {
|
|
i2p::data::Tag<32> staticKeyTag(staticKey);
|
|
auto it = m_ECIESx25519Sessions.find(staticKeyTag);
|
|
if (it != m_ECIESx25519Sessions.end()) {
|
|
if (it->second->CanBeRestarted(i2p::util::GetSecondsSinceEpoch())) {
|
|
it->second->Terminate(); // detach
|
|
m_ECIESx25519Sessions.erase(it);
|
|
} else {
|
|
LogPrint(eLogInfo, "Garlic: ECIESx25519 session with static key ", staticKeyTag.ToBase64(),
|
|
" already exists");
|
|
return;
|
|
}
|
|
}
|
|
m_ECIESx25519Sessions.emplace(staticKeyTag, session);
|
|
}
|
|
|
|
void GarlicDestination::RemoveECIESx25519Session(const uint8_t *staticKey) {
|
|
auto it = m_ECIESx25519Sessions.find(staticKey);
|
|
if (it != m_ECIESx25519Sessions.end()) {
|
|
it->second->Terminate();
|
|
m_ECIESx25519Sessions.erase(it);
|
|
}
|
|
}
|
|
|
|
uint8_t *GarlicDestination::GetPayloadBuffer() {
|
|
if (!m_PayloadBuffer)
|
|
m_PayloadBuffer = new uint8_t[I2NP_MAX_MESSAGE_SIZE];
|
|
return m_PayloadBuffer;
|
|
}
|
|
}
|
|
}
|