mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-10-31 09:20:38 +00:00
a348e10620
This fixes the following issues (flagged by cppcheck): [libi2pd/ECIESX25519AEADRatchetSession.cpp:537]: (error) Buffer is accessed out of bounds: m_NSREncodedKey [libi2pd/Identity.cpp:22]: (error) Buffer is accessed out of bounds: keys.publicKey [libi2pd/Identity.cpp:22]: (error) Buffer is accessed out of bounds: publicKey [libi2pd/NetDb.cpp:70] -> [libi2pd/NetDb.cpp:69]: (error) Iterator 'it' used after element has been erased [libi2pd/SSUData.cpp:186] -> [libi2pd/SSUData.cpp:187]: (warning) Shifting 32-bit value by 63 bits is undefined behaviour.
1211 lines
42 KiB
C++
1211 lines
42 KiB
C++
/*
|
|
* Copyright (c) 2013-2021, The PurpleI2P Project
|
|
*
|
|
* This file is part of Purple i2pd project and licensed under BSD3
|
|
*
|
|
* See full license text in LICENSE file at top of project tree
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <openssl/sha.h>
|
|
#include "Log.h"
|
|
#include "util.h"
|
|
#include "Crypto.h"
|
|
#include "Elligator.h"
|
|
#include "Tag.h"
|
|
#include "I2PEndian.h"
|
|
#include "Timestamp.h"
|
|
#include "Tunnel.h"
|
|
#include "TunnelPool.h"
|
|
#include "Transports.h"
|
|
#include "ECIESX25519AEADRatchetSession.h"
|
|
|
|
namespace i2p
|
|
{
|
|
namespace garlic
|
|
{
|
|
|
|
void RatchetTagSet::DHInitialize (const uint8_t * rootKey, const uint8_t * k)
|
|
{
|
|
// DH_INITIALIZE(rootKey, k)
|
|
uint8_t keydata[64];
|
|
i2p::crypto::HKDF (rootKey, k, 32, "KDFDHRatchetStep", keydata); // keydata = HKDF(rootKey, k, "KDFDHRatchetStep", 64)
|
|
memcpy (m_NextRootKey, keydata, 32); // nextRootKey = keydata[0:31]
|
|
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "TagAndKeyGenKeys", m_SessionTagKeyData);
|
|
// [sessTag_ck, symmKey_ck] = HKDF(keydata[32:63], ZEROLEN, "TagAndKeyGenKeys", 64)
|
|
memcpy (m_SymmKeyCK, (const uint8_t *)m_SessionTagKeyData + 32, 32);
|
|
m_NextSymmKeyIndex = 0;
|
|
}
|
|
|
|
void RatchetTagSet::NextSessionTagRatchet ()
|
|
{
|
|
i2p::crypto::HKDF (m_SessionTagKeyData, nullptr, 0, "STInitialization", m_SessionTagKeyData); // [sessTag_ck, sesstag_constant] = HKDF(sessTag_ck, ZEROLEN, "STInitialization", 64)
|
|
memcpy (m_SessTagConstant, (const uint8_t *)m_SessionTagKeyData + 32, 32); // SESSTAG_CONSTANT = keydata[32:63]
|
|
m_NextIndex = 0;
|
|
}
|
|
|
|
uint64_t RatchetTagSet::GetNextSessionTag ()
|
|
{
|
|
m_NextIndex++;
|
|
if (m_NextIndex >= 65535)
|
|
{
|
|
LogPrint (eLogError, "Garlic: Tagset ", GetTagSetID (), " is empty");
|
|
return 0;
|
|
}
|
|
i2p::crypto::HKDF (m_SessionTagKeyData, m_SessTagConstant, 32, "SessionTagKeyGen", m_SessionTagKeyData); // [sessTag_ck, tag] = HKDF(sessTag_chainkey, SESSTAG_CONSTANT, "SessionTagKeyGen", 64)
|
|
return m_SessionTagKeyData.GetLL ()[4]; // tag = keydata[32:39]
|
|
}
|
|
|
|
void RatchetTagSet::GetSymmKey (int index, uint8_t * key)
|
|
{
|
|
if (index >= m_NextSymmKeyIndex)
|
|
{
|
|
auto num = index + 1 - m_NextSymmKeyIndex;
|
|
if (!m_NextSymmKeyIndex)
|
|
{
|
|
i2p::crypto::HKDF (m_SymmKeyCK, nullptr, 0, "SymmetricRatchet", m_CurrentSymmKeyCK); // keydata_0 = HKDF(symmKey_ck, SYMMKEY_CONSTANT, "SymmetricRatchet", 64)
|
|
m_NextSymmKeyIndex = 1;
|
|
num--;
|
|
}
|
|
for (int i = 0; i < num; i++)
|
|
{
|
|
i2p::crypto::HKDF (m_CurrentSymmKeyCK, nullptr, 0, "SymmetricRatchet", m_CurrentSymmKeyCK);
|
|
if (i < num - 1)
|
|
m_ItermediateSymmKeys.emplace (m_NextSymmKeyIndex + i, m_CurrentSymmKeyCK + 32);
|
|
}
|
|
m_NextSymmKeyIndex += num;
|
|
memcpy (key, m_CurrentSymmKeyCK + 32, 32);
|
|
}
|
|
else
|
|
{
|
|
auto it = m_ItermediateSymmKeys.find (index);
|
|
if (it != m_ItermediateSymmKeys.end ())
|
|
{
|
|
memcpy (key, it->second, 32);
|
|
m_ItermediateSymmKeys.erase (it);
|
|
}
|
|
else
|
|
LogPrint (eLogError, "Garlic: Missing symmetric key for index ", index);
|
|
}
|
|
}
|
|
|
|
void RatchetTagSet::DeleteSymmKey (int index)
|
|
{
|
|
m_ItermediateSymmKeys.erase (index);
|
|
}
|
|
|
|
void ReceiveRatchetTagSet::Expire ()
|
|
{
|
|
if (!m_ExpirationTimestamp)
|
|
m_ExpirationTimestamp = i2p::util::GetSecondsSinceEpoch () + ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT;
|
|
}
|
|
|
|
bool ReceiveRatchetTagSet::IsExpired (uint64_t ts) const
|
|
{
|
|
return m_ExpirationTimestamp && ts > m_ExpirationTimestamp;
|
|
}
|
|
|
|
bool ReceiveRatchetTagSet::IsIndexExpired (int index) const
|
|
{
|
|
return index < m_TrimBehindIndex;
|
|
}
|
|
|
|
bool ReceiveRatchetTagSet::HandleNextMessage (uint8_t * buf, size_t len, int index)
|
|
{
|
|
auto session = GetSession ();
|
|
if (!session) return false;
|
|
return session->HandleNextMessage (buf, len, shared_from_this (), index);
|
|
}
|
|
|
|
SymmetricKeyTagSet::SymmetricKeyTagSet (GarlicDestination * destination, const uint8_t * key):
|
|
ReceiveRatchetTagSet (nullptr), m_Destination (destination)
|
|
{
|
|
memcpy (m_Key, key, 32);
|
|
Expire ();
|
|
}
|
|
|
|
bool SymmetricKeyTagSet::HandleNextMessage (uint8_t * buf, size_t len, int index)
|
|
{
|
|
if (len < 24) return false;
|
|
uint8_t nonce[12];
|
|
memset (nonce, 0, 12); // n = 0
|
|
size_t offset = 8; // first 8 bytes is reply tag used as AD
|
|
len -= 16; // poly1305
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf + offset, len - offset, buf, 8, m_Key, nonce, buf + offset, len - offset, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Symmetric key tagset AEAD decryption failed");
|
|
return false;
|
|
}
|
|
// we assume 1 I2NP block with delivery type local
|
|
if (offset + 3 > len)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Symmetric key tagset is too short ", len);
|
|
return false;
|
|
}
|
|
if (buf[offset] != eECIESx25519BlkGalicClove)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Symmetric key tagset unexpected block ", (int)buf[offset]);
|
|
return false;
|
|
}
|
|
offset++;
|
|
auto size = bufbe16toh (buf + offset);
|
|
offset += 2;
|
|
if (offset + size > len)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Symmetric key tagset block is too long ", size);
|
|
return false;
|
|
}
|
|
if (m_Destination)
|
|
m_Destination->HandleECIESx25519GarlicClove (buf + offset, size);
|
|
return true;
|
|
}
|
|
|
|
ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner, bool attachLeaseSetNS):
|
|
GarlicRoutingSession (owner, true)
|
|
{
|
|
if (!attachLeaseSetNS) SetLeaseSetUpdateStatus (eLeaseSetUpToDate);
|
|
RAND_bytes (m_PaddingSizes, 32); m_NextPaddingSize = 0;
|
|
}
|
|
|
|
ECIESX25519AEADRatchetSession::~ECIESX25519AEADRatchetSession ()
|
|
{
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::CreateNonce (uint64_t seqn, uint8_t * nonce)
|
|
{
|
|
memset (nonce, 0, 4);
|
|
htole64buf (nonce + 4, seqn);
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::GenerateEphemeralKeysAndEncode (uint8_t * buf)
|
|
{
|
|
bool ineligible = false;
|
|
while (!ineligible)
|
|
{
|
|
m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
|
|
ineligible = m_EphemeralKeys->IsElligatorIneligible ();
|
|
if (!ineligible) // we haven't tried it yet
|
|
{
|
|
if (i2p::crypto::GetElligator ()->Encode (m_EphemeralKeys->GetPublicKey (), buf))
|
|
return true; // success
|
|
// otherwise return back
|
|
m_EphemeralKeys->SetElligatorIneligible ();
|
|
i2p::transport::transports.ReuseX25519KeysPair (m_EphemeralKeys);
|
|
}
|
|
else
|
|
i2p::transport::transports.ReuseX25519KeysPair (m_EphemeralKeys);
|
|
}
|
|
// we still didn't find elligator eligible pair
|
|
for (int i = 0; i < 25; i++)
|
|
{
|
|
// create new
|
|
m_EphemeralKeys = std::make_shared<i2p::crypto::X25519Keys>();
|
|
m_EphemeralKeys->GenerateKeys ();
|
|
if (i2p::crypto::GetElligator ()->Encode (m_EphemeralKeys->GetPublicKey (), buf))
|
|
return true; // success
|
|
else
|
|
{
|
|
// let NTCP2 use it
|
|
m_EphemeralKeys->SetElligatorIneligible ();
|
|
i2p::transport::transports.ReuseX25519KeysPair (m_EphemeralKeys);
|
|
}
|
|
}
|
|
LogPrint (eLogError, "Garlic: Can't generate elligator eligible x25519 keys");
|
|
return false;
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::InitNewSessionTagset (std::shared_ptr<RatchetTagSet> tagsetNsr) const
|
|
{
|
|
uint8_t tagsetKey[32];
|
|
i2p::crypto::HKDF (m_CK, nullptr, 0, "SessionReplyTags", tagsetKey, 32); // tagsetKey = HKDF(chainKey, ZEROLEN, "SessionReplyTags", 32)
|
|
// Session Tag Ratchet
|
|
tagsetNsr->DHInitialize (m_CK, tagsetKey); // tagset_nsr = DH_INITIALIZE(chainKey, tagsetKey)
|
|
tagsetNsr->NextSessionTagRatchet ();
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
|
|
{
|
|
if (!GetOwner ()) return false;
|
|
// we are Bob
|
|
// KDF1
|
|
i2p::crypto::InitNoiseIKState (GetNoiseState (), GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)); // bpk
|
|
|
|
if (!i2p::crypto::GetElligator ()->Decode (buf, m_Aepk))
|
|
{
|
|
LogPrint (eLogError, "Garlic: Can't decode elligator");
|
|
return false;
|
|
}
|
|
buf += 32; len -= 32;
|
|
MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
|
|
|
|
uint8_t sharedSecret[32];
|
|
if (!GetOwner ()->Decrypt (m_Aepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Alice ephemeral key");
|
|
return false;
|
|
}
|
|
MixKey (sharedSecret);
|
|
|
|
// decrypt flags/static
|
|
uint8_t nonce[12], fs[32];
|
|
CreateNonce (0, nonce);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 32, m_H, 32, m_CK + 32, nonce, fs, 32, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Flags/static section AEAD verification failed ");
|
|
return false;
|
|
}
|
|
MixHash (buf, 48); // h = SHA256(h || ciphertext)
|
|
buf += 48; len -= 48; // 32 data + 16 poly
|
|
|
|
// KDF2 for payload
|
|
bool isStatic = !i2p::data::Tag<32> (fs).IsZero ();
|
|
if (isStatic)
|
|
{
|
|
// static key, fs is apk
|
|
memcpy (m_RemoteStaticKey, fs, 32);
|
|
if (!GetOwner ()->Decrypt (fs, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, apk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Alice static key");
|
|
return false;
|
|
}
|
|
MixKey (sharedSecret);
|
|
}
|
|
else // all zeros flags
|
|
CreateNonce (1, nonce);
|
|
|
|
// decrypt payload
|
|
std::vector<uint8_t> payload (len - 16); // we must save original ciphertext
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, m_CK + 32, nonce, payload.data (), len - 16, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD verification failed");
|
|
return false;
|
|
}
|
|
|
|
m_State = eSessionStateNewSessionReceived;
|
|
if (isStatic)
|
|
{
|
|
MixHash (buf, len); // h = SHA256(h || ciphertext)
|
|
GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
|
|
}
|
|
HandlePayload (payload.data (), len - 16, nullptr, 0);
|
|
|
|
return true;
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::HandlePayload (const uint8_t * buf, size_t len, const std::shared_ptr<ReceiveRatchetTagSet>& receiveTagset, int index)
|
|
{
|
|
size_t offset = 0;
|
|
while (offset < len)
|
|
{
|
|
uint8_t blk = buf[offset];
|
|
offset++;
|
|
auto size = bufbe16toh (buf + offset);
|
|
offset += 2;
|
|
LogPrint (eLogDebug, "Garlic: Block type ", (int)blk, " of size ", size);
|
|
if (size > len)
|
|
{
|
|
LogPrint (eLogError, "Garlic: Unexpected block length ", size);
|
|
break;
|
|
}
|
|
switch (blk)
|
|
{
|
|
case eECIESx25519BlkGalicClove:
|
|
if (GetOwner ())
|
|
GetOwner ()->HandleECIESx25519GarlicClove (buf + offset, size);
|
|
break;
|
|
case eECIESx25519BlkNextKey:
|
|
LogPrint (eLogDebug, "Garlic: next key");
|
|
if (receiveTagset)
|
|
HandleNextKey (buf + offset, size, receiveTagset);
|
|
else
|
|
LogPrint (eLogError, "Garlic: Unexpected next key block");
|
|
break;
|
|
case eECIESx25519BlkAck:
|
|
{
|
|
LogPrint (eLogDebug, "Garlic: ack");
|
|
int numAcks = size >> 2; // /4
|
|
auto offset1 = offset;
|
|
for (auto i = 0; i < numAcks; i++)
|
|
{
|
|
offset1 += 2; // tagsetid
|
|
MessageConfirmed (bufbe16toh (buf + offset1)); offset1 += 2; // N
|
|
}
|
|
break;
|
|
}
|
|
case eECIESx25519BlkAckRequest:
|
|
{
|
|
LogPrint (eLogDebug, "Garlic: ack request");
|
|
m_AckRequests.push_back ({receiveTagset->GetTagSetID (), index});
|
|
break;
|
|
}
|
|
case eECIESx25519BlkTermination:
|
|
LogPrint (eLogDebug, "Garlic: termination");
|
|
if (GetOwner ())
|
|
GetOwner ()->RemoveECIESx25519Session (m_RemoteStaticKey);
|
|
if (receiveTagset) receiveTagset->Expire ();
|
|
break;
|
|
case eECIESx25519BlkDateTime:
|
|
LogPrint (eLogDebug, "Garlic: datetime");
|
|
break;
|
|
case eECIESx25519BlkOptions:
|
|
LogPrint (eLogDebug, "Garlic: options");
|
|
break;
|
|
case eECIESx25519BlkPadding:
|
|
LogPrint (eLogDebug, "Garlic: padding");
|
|
break;
|
|
default:
|
|
LogPrint (eLogWarning, "Garlic: Unknown block type ", (int)blk);
|
|
}
|
|
offset += size;
|
|
}
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::HandleNextKey (const uint8_t * buf, size_t len, const std::shared_ptr<ReceiveRatchetTagSet>& receiveTagset)
|
|
{
|
|
uint8_t flag = buf[0]; buf++; // flag
|
|
if (flag & ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG)
|
|
{
|
|
if (!m_SendForwardKey || !m_NextSendRatchet) return;
|
|
uint16_t keyID = bufbe16toh (buf); buf += 2; // keyID
|
|
if (((!m_NextSendRatchet->newKey || !m_NextSendRatchet->keyID) && keyID == m_NextSendRatchet->keyID) ||
|
|
(m_NextSendRatchet->newKey && keyID == m_NextSendRatchet->keyID -1))
|
|
{
|
|
if (flag & ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG)
|
|
memcpy (m_NextSendRatchet->remote, buf, 32);
|
|
uint8_t sharedSecret[32], tagsetKey[32];
|
|
m_NextSendRatchet->key->Agree (m_NextSendRatchet->remote, sharedSecret);
|
|
i2p::crypto::HKDF (sharedSecret, nullptr, 0, "XDHRatchetTagSet", tagsetKey, 32); // tagsetKey = HKDF(sharedSecret, ZEROLEN, "XDHRatchetTagSet", 32)
|
|
auto newTagset = std::make_shared<RatchetTagSet> ();
|
|
newTagset->SetTagSetID (1 + m_NextSendRatchet->keyID + keyID);
|
|
newTagset->DHInitialize (m_SendTagset->GetNextRootKey (), tagsetKey);
|
|
newTagset->NextSessionTagRatchet ();
|
|
m_SendTagset = newTagset;
|
|
m_SendForwardKey = false;
|
|
LogPrint (eLogDebug, "Garlic: next send tagset ", newTagset->GetTagSetID (), " created");
|
|
}
|
|
else
|
|
LogPrint (eLogDebug, "Garlic: Unexpected next key ", keyID);
|
|
}
|
|
else
|
|
{
|
|
uint16_t keyID = bufbe16toh (buf); buf += 2; // keyID
|
|
bool newKey = flag & ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
|
|
m_SendReverseKey = true;
|
|
if (!m_NextReceiveRatchet)
|
|
m_NextReceiveRatchet.reset (new DHRatchet ());
|
|
else
|
|
{
|
|
if (keyID == m_NextReceiveRatchet->keyID && newKey == m_NextReceiveRatchet->newKey)
|
|
{
|
|
LogPrint (eLogDebug, "Garlic: Duplicate ", newKey ? "new" : "old", " key ", keyID, " received");
|
|
return;
|
|
}
|
|
m_NextReceiveRatchet->keyID = keyID;
|
|
}
|
|
int tagsetID = 2*keyID;
|
|
if (newKey)
|
|
{
|
|
m_NextReceiveRatchet->key = i2p::transport::transports.GetNextX25519KeysPair ();
|
|
m_NextReceiveRatchet->newKey = true;
|
|
tagsetID++;
|
|
}
|
|
else
|
|
m_NextReceiveRatchet->newKey = false;
|
|
if (flag & ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG)
|
|
memcpy (m_NextReceiveRatchet->remote, buf, 32);
|
|
|
|
uint8_t sharedSecret[32], tagsetKey[32];
|
|
m_NextReceiveRatchet->key->Agree (m_NextReceiveRatchet->remote, sharedSecret);
|
|
i2p::crypto::HKDF (sharedSecret, nullptr, 0, "XDHRatchetTagSet", tagsetKey, 32); // tagsetKey = HKDF(sharedSecret, ZEROLEN, "XDHRatchetTagSet", 32)
|
|
auto newTagset = std::make_shared<ReceiveRatchetTagSet>(shared_from_this ());
|
|
newTagset->SetTagSetID (tagsetID);
|
|
newTagset->DHInitialize (receiveTagset->GetNextRootKey (), tagsetKey);
|
|
newTagset->NextSessionTagRatchet ();
|
|
GenerateMoreReceiveTags (newTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
|
|
GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MAX_NUM_GENERATED_TAGS);
|
|
receiveTagset->Expire ();
|
|
LogPrint (eLogDebug, "Garlic: next receive tagset ", tagsetID, " created");
|
|
}
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::NewNextSendRatchet ()
|
|
{
|
|
if (m_NextSendRatchet)
|
|
{
|
|
if (!m_NextSendRatchet->newKey || !m_NextSendRatchet->keyID)
|
|
{
|
|
m_NextSendRatchet->keyID++;
|
|
m_NextSendRatchet->newKey = true;
|
|
}
|
|
else
|
|
m_NextSendRatchet->newKey = false;
|
|
}
|
|
else
|
|
m_NextSendRatchet.reset (new DHRatchet ());
|
|
if (m_NextSendRatchet->newKey)
|
|
m_NextSendRatchet->key = i2p::transport::transports.GetNextX25519KeysPair ();
|
|
|
|
m_SendForwardKey = true;
|
|
LogPrint (eLogDebug, "Garlic: new send ratchet ", m_NextSendRatchet->newKey ? "new" : "old", " key ", m_NextSendRatchet->keyID, " created");
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NewOutgoingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen, bool isStatic)
|
|
{
|
|
// we are Alice, bpk is m_RemoteStaticKey
|
|
size_t offset = 0;
|
|
if (!GenerateEphemeralKeysAndEncode (out + offset))
|
|
{
|
|
LogPrint (eLogError, "Garlic: Can't encode elligator");
|
|
return false;
|
|
}
|
|
offset += 32;
|
|
|
|
// KDF1
|
|
i2p::crypto::InitNoiseIKState (GetNoiseState (), m_RemoteStaticKey); // bpk
|
|
MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || aepk)
|
|
uint8_t sharedSecret[32];
|
|
if (!m_EphemeralKeys->Agree (m_RemoteStaticKey, sharedSecret)) // x25519(aesk, bpk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Bob static key");
|
|
return false;
|
|
}
|
|
MixKey (sharedSecret);
|
|
// encrypt flags/static key section
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
const uint8_t * fs;
|
|
if (isStatic)
|
|
fs = GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD);
|
|
else
|
|
{
|
|
memset (out + offset, 0, 32); // all zeros flags section
|
|
fs = out + offset;
|
|
}
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (fs, 32, m_H, 32, m_CK + 32, nonce, out + offset, 48, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Flags/static section AEAD encryption failed ");
|
|
return false;
|
|
}
|
|
|
|
MixHash (out + offset, 48); // h = SHA256(h || ciphertext)
|
|
offset += 48;
|
|
// KDF2
|
|
if (isStatic)
|
|
{
|
|
GetOwner ()->Decrypt (m_RemoteStaticKey, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD); // x25519 (ask, bpk)
|
|
MixKey (sharedSecret);
|
|
}
|
|
else
|
|
CreateNonce (1, nonce);
|
|
// encrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_CK + 32, nonce, out + offset, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
|
|
m_State = eSessionStateNewSessionSent;
|
|
if (isStatic)
|
|
{
|
|
MixHash (out + offset, len + 16); // h = SHA256(h || ciphertext)
|
|
if (GetOwner ())
|
|
{
|
|
auto tagsetNsr = std::make_shared<ReceiveRatchetTagSet>(shared_from_this (), true);
|
|
InitNewSessionTagset (tagsetNsr);
|
|
tagsetNsr->Expire (); // let non-replied session expire
|
|
GenerateMoreReceiveTags (tagsetNsr, ECIESX25519_NSR_NUM_GENERATED_TAGS);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
|
|
{
|
|
// we are Bob
|
|
m_NSRSendTagset = std::make_shared<RatchetTagSet>();
|
|
InitNewSessionTagset (m_NSRSendTagset);
|
|
uint64_t tag = m_NSRSendTagset->GetNextSessionTag ();
|
|
|
|
size_t offset = 0;
|
|
memcpy (out + offset, &tag, 8);
|
|
offset += 8;
|
|
if (!GenerateEphemeralKeysAndEncode (out + offset)) // bepk
|
|
{
|
|
LogPrint (eLogError, "Garlic: Can't encode elligator");
|
|
return false;
|
|
}
|
|
memcpy (m_NSREncodedKey, out + offset, 32); // for possible next NSR
|
|
memcpy (m_NSRH, m_H, 32);
|
|
offset += 32;
|
|
// KDF for Reply Key Section
|
|
MixHash ((const uint8_t *)&tag, 8); // h = SHA256(h || tag)
|
|
MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || bepk)
|
|
uint8_t sharedSecret[32];
|
|
if (!m_EphemeralKeys->Agree (m_Aepk, sharedSecret)) // sharedSecret = x25519(besk, aepk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Alice ephemeral key");
|
|
return false;
|
|
}
|
|
MixKey (sharedSecret);
|
|
if (!m_EphemeralKeys->Agree (m_RemoteStaticKey, sharedSecret)) // sharedSecret = x25519(besk, apk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Alice static key");
|
|
return false;
|
|
}
|
|
MixKey (sharedSecret);
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
// calculate hash for zero length
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + offset, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Reply key section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
MixHash (out + offset, 16); // h = SHA256(h || ciphertext)
|
|
offset += 16;
|
|
// KDF for payload
|
|
uint8_t keydata[64];
|
|
i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
|
|
// k_ab = keydata[0:31], k_ba = keydata[32:63]
|
|
auto receiveTagset = std::make_shared<ReceiveRatchetTagSet>(shared_from_this());
|
|
receiveTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
|
|
receiveTagset->NextSessionTagRatchet ();
|
|
m_SendTagset = std::make_shared<RatchetTagSet>();
|
|
m_SendTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
|
|
m_SendTagset->NextSessionTagRatchet ();
|
|
GenerateMoreReceiveTags (receiveTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
|
|
GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MIN_NUM_GENERATED_TAGS);
|
|
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", m_NSRKey, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
|
|
// encrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + offset, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: NSR payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
m_State = eSessionStateNewSessionReplySent;
|
|
m_SessionCreatedTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NextNewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
|
|
{
|
|
// we are Bob and sent NSR already
|
|
uint64_t tag = m_NSRSendTagset->GetNextSessionTag (); // next tag
|
|
memcpy (out, &tag, 8);
|
|
memcpy (out + 8, m_NSREncodedKey, 32);
|
|
// recalculate h with new tag
|
|
memcpy (m_H, m_NSRH, 32);
|
|
MixHash ((const uint8_t *)&tag, 8); // h = SHA256(h || tag)
|
|
MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || bepk)
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + 40, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Reply key section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
MixHash (out + 40, 16); // h = SHA256(h || ciphertext)
|
|
// encrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + 56, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Next NSR payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleNewOutgoingSessionReply (uint8_t * buf, size_t len)
|
|
{
|
|
// we are Alice
|
|
LogPrint (eLogDebug, "Garlic: reply received");
|
|
const uint8_t * tag = buf;
|
|
buf += 8; len -= 8; // tag
|
|
uint8_t bepk[32]; // Bob's ephemeral key
|
|
if (!i2p::crypto::GetElligator ()->Decode (buf, bepk))
|
|
{
|
|
LogPrint (eLogError, "Garlic: Can't decode elligator");
|
|
return false;
|
|
}
|
|
buf += 32; len -= 32;
|
|
// KDF for Reply Key Section
|
|
i2p::util::SaveStateHelper<i2p::crypto::NoiseSymmetricState> s(GetNoiseState ()); // restore noise state on exit
|
|
MixHash (tag, 8); // h = SHA256(h || tag)
|
|
MixHash (bepk, 32); // h = SHA256(h || bepk)
|
|
uint8_t sharedSecret[32];
|
|
if (!m_EphemeralKeys->Agree (bepk, sharedSecret)) // sharedSecret = x25519(aesk, bepk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Bob ephemeral key");
|
|
return false;
|
|
}
|
|
MixKey (sharedSecret);
|
|
GetOwner ()->Decrypt (bepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD); // x25519 (ask, bepk)
|
|
MixKey (sharedSecret);
|
|
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
// calculate hash for zero length
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 0, m_H, 32, m_CK + 32, nonce, sharedSecret/* can be anything */, 0, false)) // decrypt, DECRYPT(k, n, ZEROLEN, ad) verification only
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Reply key section AEAD decryption failed");
|
|
return false;
|
|
}
|
|
MixHash (buf, 16); // h = SHA256(h || ciphertext)
|
|
buf += 16; len -= 16;
|
|
// KDF for payload
|
|
uint8_t keydata[64];
|
|
i2p::crypto::HKDF (m_CK, nullptr, 0, "", keydata); // keydata = HKDF(chainKey, ZEROLEN, "", 64)
|
|
if (m_State == eSessionStateNewSessionSent)
|
|
{
|
|
// only first time, then we keep using existing tagsets
|
|
// k_ab = keydata[0:31], k_ba = keydata[32:63]
|
|
m_SendTagset = std::make_shared<RatchetTagSet>();
|
|
m_SendTagset->DHInitialize (m_CK, keydata); // tagset_ab = DH_INITIALIZE(chainKey, k_ab)
|
|
m_SendTagset->NextSessionTagRatchet ();
|
|
auto receiveTagset = std::make_shared<ReceiveRatchetTagSet>(shared_from_this ());
|
|
receiveTagset->DHInitialize (m_CK, keydata + 32); // tagset_ba = DH_INITIALIZE(chainKey, k_ba)
|
|
receiveTagset->NextSessionTagRatchet ();
|
|
GenerateMoreReceiveTags (receiveTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
|
|
GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MIN_NUM_GENERATED_TAGS);
|
|
}
|
|
i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
|
|
// decrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, keydata, nonce, buf, len - 16, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
|
|
return false;
|
|
}
|
|
|
|
if (m_State == eSessionStateNewSessionSent)
|
|
{
|
|
m_State = eSessionStateEstablished;
|
|
//m_EphemeralKeys = nullptr; // TODO: delete after a while
|
|
m_SessionCreatedTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
|
|
}
|
|
HandlePayload (buf, len - 16, nullptr, 0);
|
|
|
|
// we have received reply to NS with LeaseSet in it
|
|
SetLeaseSetUpdateStatus (eLeaseSetUpToDate);
|
|
SetLeaseSetUpdateMsgID (0);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::NewExistingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
|
|
{
|
|
uint8_t nonce[12];
|
|
auto index = m_SendTagset->GetNextIndex ();
|
|
CreateNonce (index, nonce); // tag's index
|
|
uint64_t tag = m_SendTagset->GetNextSessionTag ();
|
|
if (!tag)
|
|
{
|
|
LogPrint (eLogError, "Garlic: can't create new ECIES-X25519-AEAD-Ratchet tag for send tagset");
|
|
if (GetOwner ())
|
|
GetOwner ()->RemoveECIESx25519Session (m_RemoteStaticKey);
|
|
return false;
|
|
}
|
|
memcpy (out, &tag, 8);
|
|
// ad = The session tag, 8 bytes
|
|
// ciphertext = ENCRYPT(k, n, payload, ad)
|
|
uint8_t key[32];
|
|
m_SendTagset->GetSymmKey (index, key);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, out, 8, key, nonce, out + 8, outLen - 8, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
|
|
return false;
|
|
}
|
|
if (index >= ECIESX25519_TAGSET_MAX_NUM_TAGS && !m_SendForwardKey)
|
|
NewNextSendRatchet ();
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleExistingSessionMessage (uint8_t * buf, size_t len,
|
|
std::shared_ptr<ReceiveRatchetTagSet> receiveTagset, int index)
|
|
{
|
|
uint8_t nonce[12];
|
|
CreateNonce (index, nonce); // tag's index
|
|
len -= 8; // tag
|
|
uint8_t * payload = buf + 8;
|
|
uint8_t key[32];
|
|
receiveTagset->GetSymmKey (index, key);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len - 16, buf, 8, key, nonce, payload, len - 16, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
|
|
return false;
|
|
}
|
|
HandlePayload (payload, len - 16, receiveTagset, index);
|
|
if (GetOwner ())
|
|
{
|
|
int moreTags = 0;
|
|
if (GetOwner ()->GetNumRatchetInboundTags () > 0) // override in settings?
|
|
{
|
|
if (receiveTagset->GetNextIndex () - index < GetOwner ()->GetNumRatchetInboundTags ()/2)
|
|
moreTags = GetOwner ()->GetNumRatchetInboundTags ();
|
|
index -= GetOwner ()->GetNumRatchetInboundTags (); // trim behind
|
|
}
|
|
else
|
|
{
|
|
moreTags = ECIESX25519_MIN_NUM_GENERATED_TAGS + (index >> 2); // N/4
|
|
if (moreTags > ECIESX25519_MAX_NUM_GENERATED_TAGS) moreTags = ECIESX25519_MAX_NUM_GENERATED_TAGS;
|
|
moreTags -= (receiveTagset->GetNextIndex () - index);
|
|
index -= ECIESX25519_MAX_NUM_GENERATED_TAGS; // trim behind
|
|
}
|
|
if (moreTags > 0)
|
|
GenerateMoreReceiveTags (receiveTagset, moreTags);
|
|
if (index > 0)
|
|
receiveTagset->SetTrimBehind (index);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::HandleNextMessage (uint8_t * buf, size_t len,
|
|
std::shared_ptr<ReceiveRatchetTagSet> receiveTagset, int index)
|
|
{
|
|
m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
switch (m_State)
|
|
{
|
|
case eSessionStateNewSessionReplySent:
|
|
m_State = eSessionStateEstablished;
|
|
m_NSRSendTagset = nullptr;
|
|
m_EphemeralKeys = nullptr;
|
|
#if (__cplusplus >= 201703L) // C++ 17 or higher
|
|
[[fallthrough]];
|
|
#endif
|
|
case eSessionStateEstablished:
|
|
if (receiveTagset->IsNS ())
|
|
{
|
|
// our of sequence NSR
|
|
LogPrint (eLogDebug, "Garlic: check for out of order NSR with index ", index);
|
|
if (receiveTagset->GetNextIndex () - index < ECIESX25519_NSR_NUM_GENERATED_TAGS/2)
|
|
GenerateMoreReceiveTags (receiveTagset, ECIESX25519_NSR_NUM_GENERATED_TAGS);
|
|
return HandleNewOutgoingSessionReply (buf, len);
|
|
}
|
|
else
|
|
return HandleExistingSessionMessage (buf, len, receiveTagset, index);
|
|
case eSessionStateNew:
|
|
return HandleNewIncomingSession (buf, len);
|
|
case eSessionStateNewSessionSent:
|
|
return HandleNewOutgoingSessionReply (buf, len);
|
|
default:
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> ECIESX25519AEADRatchetSession::WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg)
|
|
{
|
|
uint8_t * payload = GetOwner ()->GetPayloadBuffer ();
|
|
if (!payload) return nullptr;
|
|
size_t len = CreatePayload (msg, m_State != eSessionStateEstablished, payload);
|
|
if (!len) return nullptr;
|
|
auto m = NewI2NPMessage (len + 100); // 96 + 4
|
|
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
|
|
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
|
|
|
|
switch (m_State)
|
|
{
|
|
case eSessionStateEstablished:
|
|
if (!NewExistingSessionMessage (payload, len, buf, m->maxLen))
|
|
return nullptr;
|
|
len += 24;
|
|
break;
|
|
case eSessionStateNew:
|
|
if (!NewOutgoingSessionMessage (payload, len, buf, m->maxLen))
|
|
return nullptr;
|
|
len += 96;
|
|
break;
|
|
case eSessionStateNewSessionReceived:
|
|
if (!NewSessionReplyMessage (payload, len, buf, m->maxLen))
|
|
return nullptr;
|
|
len += 72;
|
|
break;
|
|
case eSessionStateNewSessionReplySent:
|
|
if (!NextNewSessionReplyMessage (payload, len, buf, m->maxLen))
|
|
return nullptr;
|
|
len += 72;
|
|
break;
|
|
case eSessionStateOneTime:
|
|
if (!NewOutgoingSessionMessage (payload, len, buf, m->maxLen, false))
|
|
return nullptr;
|
|
len += 96;
|
|
break;
|
|
default:
|
|
return nullptr;
|
|
}
|
|
|
|
htobe32buf (m->GetPayload (), len);
|
|
m->len += len + 4;
|
|
m->FillI2NPMessageHeader (eI2NPGarlic);
|
|
return m;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> ECIESX25519AEADRatchetSession::WrapOneTimeMessage (std::shared_ptr<const I2NPMessage> msg)
|
|
{
|
|
m_State = eSessionStateOneTime;
|
|
return WrapSingleMessage (msg);
|
|
}
|
|
|
|
size_t ECIESX25519AEADRatchetSession::CreatePayload (std::shared_ptr<const I2NPMessage> msg, bool first, uint8_t * payload)
|
|
{
|
|
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
|
|
size_t payloadLen = 0;
|
|
if (first) payloadLen += 7;// datatime
|
|
if (msg)
|
|
{
|
|
payloadLen += msg->GetPayloadLength () + 13;
|
|
if (m_Destination) payloadLen += 32;
|
|
}
|
|
if (GetLeaseSetUpdateStatus () == eLeaseSetSubmitted && ts > GetLeaseSetSubmissionTime () + LEASET_CONFIRMATION_TIMEOUT)
|
|
{
|
|
// resubmit non-confirmed LeaseSet
|
|
SetLeaseSetUpdateStatus (eLeaseSetUpdated);
|
|
SetSharedRoutingPath (nullptr); // invalidate path since leaseset was not confirmed
|
|
}
|
|
auto leaseSet = (GetLeaseSetUpdateStatus () == eLeaseSetUpdated) ? GetOwner ()->GetLeaseSet () : nullptr;
|
|
if (leaseSet)
|
|
{
|
|
payloadLen += leaseSet->GetBufferLen () + DATABASE_STORE_HEADER_SIZE + 13;
|
|
if (!first)
|
|
{
|
|
// ack request
|
|
SetLeaseSetUpdateStatus (eLeaseSetSubmitted);
|
|
SetLeaseSetUpdateMsgID (m_SendTagset->GetNextIndex ());
|
|
SetLeaseSetSubmissionTime (ts);
|
|
payloadLen += 4;
|
|
}
|
|
}
|
|
if (m_AckRequests.size () > 0)
|
|
payloadLen += m_AckRequests.size ()*4 + 3;
|
|
if (m_SendReverseKey)
|
|
{
|
|
payloadLen += 6;
|
|
if (m_NextReceiveRatchet->newKey) payloadLen += 32;
|
|
}
|
|
if (m_SendForwardKey)
|
|
{
|
|
payloadLen += 6;
|
|
if (m_NextSendRatchet->newKey) payloadLen += 32;
|
|
}
|
|
uint8_t paddingSize = 0;
|
|
if (payloadLen || ts > m_LastSentTimestamp + ECIESX25519_SEND_INACTIVITY_TIMEOUT)
|
|
{
|
|
int delta = (int)ECIESX25519_OPTIMAL_PAYLOAD_SIZE - (int)payloadLen;
|
|
if (delta < 0 || delta > 3) // don't create padding if we are close to optimal size
|
|
{
|
|
paddingSize = m_PaddingSizes[m_NextPaddingSize++] & 0x0F; // 0 - 15
|
|
if (m_NextPaddingSize >= 32)
|
|
{
|
|
RAND_bytes (m_PaddingSizes, 32);
|
|
m_NextPaddingSize = 0;
|
|
}
|
|
if (delta > 3)
|
|
{
|
|
delta -= 3;
|
|
if (paddingSize >= delta) paddingSize %= delta;
|
|
}
|
|
paddingSize++;
|
|
payloadLen += paddingSize + 3;
|
|
}
|
|
}
|
|
if (payloadLen)
|
|
{
|
|
if (payloadLen > I2NP_MAX_MESSAGE_SIZE)
|
|
{
|
|
LogPrint (eLogError, "Garlic: payload length ", payloadLen, " is too long");
|
|
return 0;
|
|
}
|
|
m_LastSentTimestamp = ts;
|
|
size_t offset = 0;
|
|
// DateTime
|
|
if (first)
|
|
{
|
|
payload[offset] = eECIESx25519BlkDateTime; offset++;
|
|
htobe16buf (payload + offset, 4); offset += 2;
|
|
htobe32buf (payload + offset, ts/1000); offset += 4; // in seconds
|
|
}
|
|
// LeaseSet
|
|
if (leaseSet)
|
|
{
|
|
offset += CreateLeaseSetClove (leaseSet, ts, payload + offset, payloadLen - offset);
|
|
if (!first)
|
|
{
|
|
// ack request
|
|
payload[offset] = eECIESx25519BlkAckRequest; offset++;
|
|
htobe16buf (payload + offset, 1); offset += 2;
|
|
payload[offset] = 0; offset++; // flags
|
|
}
|
|
}
|
|
// msg
|
|
if (msg)
|
|
offset += CreateGarlicClove (msg, payload + offset, payloadLen - offset);
|
|
// ack
|
|
if (m_AckRequests.size () > 0)
|
|
{
|
|
payload[offset] = eECIESx25519BlkAck; offset++;
|
|
htobe16buf (payload + offset, m_AckRequests.size () * 4); offset += 2;
|
|
for (auto& it: m_AckRequests)
|
|
{
|
|
htobe16buf (payload + offset, it.first); offset += 2;
|
|
htobe16buf (payload + offset, it.second); offset += 2;
|
|
}
|
|
m_AckRequests.clear ();
|
|
}
|
|
// next keys
|
|
if (m_SendReverseKey)
|
|
{
|
|
payload[offset] = eECIESx25519BlkNextKey; offset++;
|
|
htobe16buf (payload + offset, m_NextReceiveRatchet->newKey ? 35 : 3); offset += 2;
|
|
payload[offset] = ECIESX25519_NEXT_KEY_REVERSE_KEY_FLAG;
|
|
int keyID = m_NextReceiveRatchet->keyID - 1;
|
|
if (m_NextReceiveRatchet->newKey)
|
|
{
|
|
payload[offset] |= ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG;
|
|
keyID++;
|
|
}
|
|
offset++; // flag
|
|
htobe16buf (payload + offset, keyID); offset += 2; // keyid
|
|
if (m_NextReceiveRatchet->newKey)
|
|
{
|
|
memcpy (payload + offset, m_NextReceiveRatchet->key->GetPublicKey (), 32);
|
|
offset += 32; // public key
|
|
}
|
|
m_SendReverseKey = false;
|
|
}
|
|
if (m_SendForwardKey)
|
|
{
|
|
payload[offset] = eECIESx25519BlkNextKey; offset++;
|
|
htobe16buf (payload + offset, m_NextSendRatchet->newKey ? 35 : 3); offset += 2;
|
|
payload[offset] = m_NextSendRatchet->newKey ? ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG : ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
|
|
if (!m_NextSendRatchet->keyID) payload[offset] |= ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG; // for first key only
|
|
offset++; // flag
|
|
htobe16buf (payload + offset, m_NextSendRatchet->keyID); offset += 2; // keyid
|
|
if (m_NextSendRatchet->newKey)
|
|
{
|
|
memcpy (payload + offset, m_NextSendRatchet->key->GetPublicKey (), 32);
|
|
offset += 32; // public key
|
|
}
|
|
}
|
|
// padding
|
|
if (paddingSize)
|
|
{
|
|
payload[offset] = eECIESx25519BlkPadding; offset++;
|
|
htobe16buf (payload + offset, paddingSize); offset += 2;
|
|
memset (payload + offset, 0, paddingSize); offset += paddingSize;
|
|
}
|
|
}
|
|
return payloadLen;
|
|
}
|
|
|
|
size_t ECIESX25519AEADRatchetSession::CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len)
|
|
{
|
|
if (!msg) return 0;
|
|
uint16_t cloveSize = msg->GetPayloadLength () + 9 + 1;
|
|
if (m_Destination) cloveSize += 32;
|
|
if ((int)len < cloveSize + 3) return 0;
|
|
buf[0] = eECIESx25519BlkGalicClove; // clove type
|
|
htobe16buf (buf + 1, cloveSize); // size
|
|
buf += 3;
|
|
if (m_Destination)
|
|
{
|
|
*buf = (eGarlicDeliveryTypeDestination << 5);
|
|
memcpy (buf + 1, *m_Destination, 32); buf += 32;
|
|
}
|
|
else
|
|
*buf = 0;
|
|
buf++; // flag and delivery instructions
|
|
*buf = msg->GetTypeID (); // I2NP msg type
|
|
htobe32buf (buf + 1, msg->GetMsgID ()); // msgID
|
|
htobe32buf (buf + 5, msg->GetExpiration () / 1000); // expiration in seconds
|
|
memcpy (buf + 9, msg->GetPayload (), msg->GetPayloadLength ());
|
|
return cloveSize + 3;
|
|
}
|
|
|
|
size_t ECIESX25519AEADRatchetSession::CreateLeaseSetClove (std::shared_ptr<const i2p::data::LocalLeaseSet> ls, uint64_t ts, uint8_t * buf, size_t len)
|
|
{
|
|
if (!ls || ls->GetStoreType () != i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2)
|
|
{
|
|
LogPrint (eLogError, "Garlic: Incorrect LeasetSet type to send");
|
|
return 0;
|
|
}
|
|
uint16_t cloveSize = 1 + 9 + DATABASE_STORE_HEADER_SIZE + ls->GetBufferLen (); // to local
|
|
if ((int)len < cloveSize + 3) return 0;
|
|
buf[0] = eECIESx25519BlkGalicClove; // clove type
|
|
htobe16buf (buf + 1, cloveSize); // size
|
|
buf += 3;
|
|
*buf = 0; buf++; // flag and delivery instructions
|
|
*buf = eI2NPDatabaseStore; buf++; // I2NP msg type
|
|
RAND_bytes (buf, 4); buf += 4; // msgID
|
|
htobe32buf (buf, (ts + I2NP_MESSAGE_EXPIRATION_TIMEOUT)/1000); buf += 4; // expiration
|
|
// payload
|
|
memcpy (buf + DATABASE_STORE_KEY_OFFSET, ls->GetStoreHash (), 32);
|
|
buf[DATABASE_STORE_TYPE_OFFSET] = i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2;
|
|
memset (buf + DATABASE_STORE_REPLY_TOKEN_OFFSET, 0, 4); // replyToken = 0
|
|
buf += DATABASE_STORE_HEADER_SIZE;
|
|
memcpy (buf, ls->GetBuffer (), ls->GetBufferLen ());
|
|
|
|
return cloveSize + 3;
|
|
}
|
|
|
|
void ECIESX25519AEADRatchetSession::GenerateMoreReceiveTags (std::shared_ptr<ReceiveRatchetTagSet> receiveTagset, int numTags)
|
|
{
|
|
if (GetOwner ())
|
|
{
|
|
for (int i = 0; i < numTags; i++)
|
|
{
|
|
auto tag = GetOwner ()->AddECIESx25519SessionNextTag (receiveTagset);
|
|
if (!tag)
|
|
{
|
|
LogPrint (eLogError, "Garlic: can't create new ECIES-X25519-AEAD-Ratchet tag for receive tagset");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool ECIESX25519AEADRatchetSession::CheckExpired (uint64_t ts)
|
|
{
|
|
CleanupUnconfirmedLeaseSet (ts);
|
|
return ts > m_LastActivityTimestamp + ECIESX25519_RECEIVE_EXPIRATION_TIMEOUT && // seconds
|
|
ts*1000 > m_LastSentTimestamp + ECIESX25519_SEND_EXPIRATION_TIMEOUT*1000; // milliseconds
|
|
}
|
|
|
|
RouterIncomingRatchetSession::RouterIncomingRatchetSession (const i2p::crypto::NoiseSymmetricState& initState):
|
|
ECIESX25519AEADRatchetSession (&i2p::context, false)
|
|
{
|
|
SetLeaseSetUpdateStatus (eLeaseSetDoNotSend);
|
|
SetNoiseState (initState);
|
|
}
|
|
|
|
bool RouterIncomingRatchetSession::HandleNextMessage (const uint8_t * buf, size_t len)
|
|
{
|
|
if (!GetOwner ()) return false;
|
|
m_CurrentNoiseState = GetNoiseState ();
|
|
// we are Bob
|
|
m_CurrentNoiseState.MixHash (buf, 32);
|
|
uint8_t sharedSecret[32];
|
|
if (!GetOwner ()->Decrypt (buf, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect N ephemeral public key");
|
|
return false;
|
|
}
|
|
m_CurrentNoiseState.MixKey (sharedSecret);
|
|
buf += 32; len -= 32;
|
|
uint8_t nonce[12];
|
|
CreateNonce (0, nonce);
|
|
std::vector<uint8_t> payload (len - 16);
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_CurrentNoiseState.m_H, 32,
|
|
m_CurrentNoiseState.m_CK + 32, nonce, payload.data (), len - 16, false)) // decrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload for router AEAD verification failed");
|
|
return false;
|
|
}
|
|
HandlePayload (payload.data (), len - 16, nullptr, 0);
|
|
return true;
|
|
}
|
|
|
|
static size_t CreateGarlicPayload (std::shared_ptr<const I2NPMessage> msg, uint8_t * payload,
|
|
bool datetime, size_t optimalSize)
|
|
{
|
|
size_t len = 0;
|
|
if (datetime)
|
|
{
|
|
// DateTime
|
|
payload[0] = eECIESx25519BlkDateTime;
|
|
htobe16buf (payload + 1, 4);
|
|
htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
|
|
len = 7;
|
|
}
|
|
// I2NP
|
|
payload += len;
|
|
uint16_t cloveSize = msg->GetPayloadLength () + 10;
|
|
payload[0] = eECIESx25519BlkGalicClove; // clove type
|
|
htobe16buf (payload + 1, cloveSize); // size
|
|
payload += 3;
|
|
payload[0] = 0; // flag and delivery instructions
|
|
payload[1] = msg->GetTypeID (); // I2NP msg type
|
|
htobe32buf (payload + 2, msg->GetMsgID ()); // msgID
|
|
htobe32buf (payload + 6, msg->GetExpiration () / 1000); // expiration in seconds
|
|
memcpy (payload + 10, msg->GetPayload (), msg->GetPayloadLength ());
|
|
len += cloveSize + 3;
|
|
payload += cloveSize;
|
|
// padding
|
|
int delta = (int)optimalSize - (int)len;
|
|
if (delta < 0 || delta > 3) // don't create padding if we are close to optimal size
|
|
{
|
|
uint8_t paddingSize = rand () & 0x0F; // 0 - 15
|
|
if (delta > 3)
|
|
{
|
|
delta -= 3;
|
|
if (paddingSize > delta) paddingSize %= delta;
|
|
}
|
|
payload[0] = eECIESx25519BlkPadding;
|
|
htobe16buf (payload + 1, paddingSize);
|
|
if (paddingSize) memset (payload + 3, 0, paddingSize);
|
|
len += paddingSize + 3;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> WrapECIESX25519Message (std::shared_ptr<const I2NPMessage> msg, const uint8_t * key, uint64_t tag)
|
|
{
|
|
auto m = NewI2NPMessage ();
|
|
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
|
|
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
|
|
size_t offset = 0;
|
|
memcpy (buf + offset, &tag, 8); offset += 8;
|
|
auto payload = buf + offset;
|
|
size_t len = CreateGarlicPayload (msg, payload, false, 956); // 1003 - 8 tag - 16 Poly1305 hash - 16 I2NP header - 4 garlic length - 3 local tunnel delivery
|
|
uint8_t nonce[12];
|
|
memset (nonce, 0, 12); // n = 0
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, buf, 8, key, nonce, payload, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
|
|
return nullptr;
|
|
}
|
|
offset += len + 16;
|
|
htobe32buf (m->GetPayload (), offset);
|
|
m->len += offset + 4;
|
|
m->FillI2NPMessageHeader (eI2NPGarlic);
|
|
return m;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> WrapECIESX25519MessageForRouter (std::shared_ptr<const I2NPMessage> msg, const uint8_t * routerPublicKey)
|
|
{
|
|
// Noise_N, we are Alice, routerPublicKey is Bob's
|
|
i2p::crypto::NoiseSymmetricState noiseState;
|
|
i2p::crypto::InitNoiseNState (noiseState, routerPublicKey);
|
|
auto m = NewI2NPMessage ();
|
|
m->Align (12); // in order to get buf aligned to 16 (12 + 4)
|
|
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
|
|
size_t offset = 0;
|
|
auto ephemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
|
|
memcpy (buf + offset, ephemeralKeys->GetPublicKey (), 32);
|
|
noiseState.MixHash (buf + offset, 32); // h = SHA256(h || aepk)
|
|
offset += 32;
|
|
uint8_t sharedSecret[32];
|
|
if (!ephemeralKeys->Agree (routerPublicKey, sharedSecret)) // x25519(aesk, bpk)
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Incorrect Bob static key");
|
|
return nullptr;
|
|
}
|
|
noiseState.MixKey (sharedSecret);
|
|
auto payload = buf + offset;
|
|
size_t len = CreateGarlicPayload (msg, payload, true, 900); // 1003 - 32 eph key - 16 Poly1305 hash - 16 I2NP header - 4 garlic length - 35 router tunnel delivery
|
|
uint8_t nonce[12];
|
|
memset (nonce, 0, 12);
|
|
// encrypt payload
|
|
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, noiseState.m_H, 32, noiseState.m_CK + 32, nonce, payload, len + 16, true)) // encrypt
|
|
{
|
|
LogPrint (eLogWarning, "Garlic: Payload for router AEAD encryption failed");
|
|
return nullptr;
|
|
}
|
|
offset += len + 16;
|
|
htobe32buf (m->GetPayload (), offset);
|
|
m->len += offset + 4;
|
|
m->FillI2NPMessageHeader (eI2NPGarlic);
|
|
return m;
|
|
}
|
|
}
|
|
}
|