i2pd/libi2pd/LeaseSet.cpp

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#include <string.h>
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#include "I2PEndian.h"
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#include "Crypto.h"
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#include "Log.h"
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#include "Timestamp.h"
#include "NetDb.hpp"
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#include "Tunnel.h"
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#include "LeaseSet.h"
namespace i2p
{
namespace data
{
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LeaseSet::LeaseSet (bool storeLeases):
m_IsValid (false), m_StoreLeases (storeLeases), m_ExpirationTime (0), m_Buffer (nullptr), m_BufferLen (0)
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{
}
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LeaseSet::LeaseSet (const uint8_t * buf, size_t len, bool storeLeases):
m_IsValid (true), m_StoreLeases (storeLeases), m_ExpirationTime (0)
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{
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m_Buffer = new uint8_t[len];
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memcpy (m_Buffer, buf, len);
m_BufferLen = len;
ReadFromBuffer ();
}
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void LeaseSet::Update (const uint8_t * buf, size_t len, bool verifySignature)
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{
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if (len > m_BufferLen)
{
auto oldBuffer = m_Buffer;
m_Buffer = new uint8_t[len];
delete[] oldBuffer;
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}
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memcpy (m_Buffer, buf, len);
m_BufferLen = len;
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ReadFromBuffer (false, verifySignature);
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}
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void LeaseSet::PopulateLeases ()
{
m_StoreLeases = true;
ReadFromBuffer (false);
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}
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void LeaseSet::ReadFromBuffer (bool readIdentity, bool verifySignature)
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{
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if (readIdentity || !m_Identity)
m_Identity = std::make_shared<IdentityEx>(m_Buffer, m_BufferLen);
size_t size = m_Identity->GetFullLen ();
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if (size > m_BufferLen)
{
LogPrint (eLogError, "LeaseSet: identity length ", size, " exceeds buffer size ", m_BufferLen);
m_IsValid = false;
return;
}
memcpy (m_EncryptionKey, m_Buffer + size, 256);
size += 256; // encryption key
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size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
uint8_t num = m_Buffer[size];
size++; // num
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LogPrint (eLogDebug, "LeaseSet: read num=", (int)num);
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if (!num || num > MAX_NUM_LEASES)
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{
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LogPrint (eLogError, "LeaseSet: incorrect number of leases", (int)num);
m_IsValid = false;
return;
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}
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UpdateLeasesBegin ();
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// process leases
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m_ExpirationTime = 0;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
const uint8_t * leases = m_Buffer + size;
for (int i = 0; i < num; i++)
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{
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Lease lease;
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lease.tunnelGateway = leases;
leases += 32; // gateway
lease.tunnelID = bufbe32toh (leases);
leases += 4; // tunnel ID
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lease.endDate = bufbe64toh (leases);
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leases += 8; // end date
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UpdateLease (lease, ts);
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}
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if (!m_ExpirationTime)
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{
LogPrint (eLogWarning, "LeaseSet: all leases are expired. Dropped");
m_IsValid = false;
return;
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}
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m_ExpirationTime += LEASE_ENDDATE_THRESHOLD;
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UpdateLeasesEnd ();
// verify
if (verifySignature && !m_Identity->Verify (m_Buffer, leases - m_Buffer, leases))
{
LogPrint (eLogWarning, "LeaseSet: verification failed");
m_IsValid = false;
}
}
void LeaseSet::UpdateLeasesBegin ()
{
// reset existing leases
if (m_StoreLeases)
for (auto& it: m_Leases)
it->isUpdated = false;
else
m_Leases.clear ();
}
void LeaseSet::UpdateLeasesEnd ()
{
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// delete old leases
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if (m_StoreLeases)
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{
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for (auto it = m_Leases.begin (); it != m_Leases.end ();)
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{
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if (!(*it)->isUpdated)
{
(*it)->endDate = 0; // somebody might still hold it
m_Leases.erase (it++);
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}
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else
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++it;
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}
}
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}
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void LeaseSet::UpdateLease (const Lease& lease, uint64_t ts)
{
if (ts < lease.endDate + LEASE_ENDDATE_THRESHOLD)
{
if (lease.endDate > m_ExpirationTime)
m_ExpirationTime = lease.endDate;
if (m_StoreLeases)
{
auto ret = m_Leases.insert (std::make_shared<Lease>(lease));
if (!ret.second) (*ret.first)->endDate = lease.endDate; // update existing
(*ret.first)->isUpdated = true;
// check if lease's gateway is in our netDb
if (!netdb.FindRouter (lease.tunnelGateway))
{
// if not found request it
LogPrint (eLogInfo, "LeaseSet: Lease's tunnel gateway not found, requesting");
netdb.RequestDestination (lease.tunnelGateway);
}
}
}
else
LogPrint (eLogWarning, "LeaseSet: Lease is expired already ");
}
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uint64_t LeaseSet::ExtractTimestamp (const uint8_t * buf, size_t len) const
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{
if (!m_Identity) return 0;
size_t size = m_Identity->GetFullLen ();
if (size > len) return 0;
size += 256; // encryption key
size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
if (size > len) return 0;
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uint8_t num = buf[size];
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size++; // num
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if (size + num*LEASE_SIZE > len) return 0;
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uint64_t timestamp= 0 ;
for (int i = 0; i < num; i++)
{
size += 36; // gateway (32) + tunnelId(4)
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auto endDate = bufbe64toh (buf + size);
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size += 8; // end date
if (!timestamp || endDate < timestamp)
timestamp = endDate;
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}
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return timestamp;
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}
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bool LeaseSet::IsNewer (const uint8_t * buf, size_t len) const
{
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return ExtractTimestamp (buf, len) > ExtractTimestamp (m_Buffer, m_BufferLen);
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}
bool LeaseSet::ExpiresSoon(const uint64_t dlt, const uint64_t fudge) const
{
auto now = i2p::util::GetMillisecondsSinceEpoch ();
if (fudge) now += rand() % fudge;
if (now >= m_ExpirationTime) return true;
return m_ExpirationTime - now <= dlt;
}
const std::vector<std::shared_ptr<const Lease> > LeaseSet::GetNonExpiredLeases (bool withThreshold) const
{
return GetNonExpiredLeasesExcluding( [] (const Lease & l) -> bool { return false; }, withThreshold);
}
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const std::vector<std::shared_ptr<const Lease> > LeaseSet::GetNonExpiredLeasesExcluding (LeaseInspectFunc exclude, bool withThreshold) const
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{
auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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std::vector<std::shared_ptr<const Lease> > leases;
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for (const auto& it: m_Leases)
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{
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auto endDate = it->endDate;
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if (withThreshold)
endDate += LEASE_ENDDATE_THRESHOLD;
else
endDate -= LEASE_ENDDATE_THRESHOLD;
if (ts < endDate && !exclude(*it))
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leases.push_back (it);
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}
return leases;
}
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bool LeaseSet::HasExpiredLeases () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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for (const auto& it: m_Leases)
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if (ts >= it->endDate) return true;
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return false;
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}
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bool LeaseSet::IsExpired () const
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{
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if (m_StoreLeases && IsEmpty ()) return true;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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return ts > m_ExpirationTime;
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}
void LeaseSet::Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const
{
auto encryptor = m_Identity->CreateEncryptor (m_EncryptionKey);
if (encryptor)
encryptor->Encrypt (data, encrypted, ctx, true);
}
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void LeaseSet::SetBuffer (const uint8_t * buf, size_t len)
{
if (m_Buffer) delete[] m_Buffer;
m_Buffer = new uint8_t[len];
m_BufferLen = len;
memcpy (m_Buffer, buf, len);
}
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LeaseSet2::LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases):
LeaseSet (storeLeases), m_StoreType (storeType)
{
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SetBuffer (buf, len);
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if (storeType == NETDB_STORE_TYPE_ENCRYPTED_LEASESET2)
ReadFromBufferEncrypted (buf, len);
else
ReadFromBuffer (buf, len);
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}
void LeaseSet2::ReadFromBuffer (const uint8_t * buf, size_t len)
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{
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// standard LS2 header
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auto identity = std::make_shared<IdentityEx>(buf, len);
SetIdentity (identity);
size_t offset = identity->GetFullLen ();
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if (offset + 8 >= len) return;
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uint32_t timestamp = bufbe32toh (buf + offset); offset += 4; // published timestamp (seconds)
uint16_t expires = bufbe16toh (buf + offset); offset += 2; // expires (seconds)
SetExpirationTime ((timestamp + expires)*1000LL); // in milliseconds
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uint16_t flags = bufbe16toh (buf + offset); offset += 2; // flags
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std::unique_ptr<i2p::crypto::Verifier> offlineVerifier;
if (flags & 0x0001)
{
// offline key
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if (offset + 6 >= len) return;
const uint8_t * signedData = buf + offset;
offset += 4; // expires timestamp
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uint16_t keyType = bufbe16toh (buf + offset); offset += 2;
offlineVerifier.reset (i2p::data::IdentityEx::CreateVerifier (keyType));
if (!offlineVerifier) return;
auto keyLen = offlineVerifier->GetPublicKeyLen ();
if (offset + keyLen >= len) return;
offlineVerifier->SetPublicKey (buf + offset); offset += keyLen;
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if (offset + identity->GetSignatureLen () >= len) return;
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if (!identity->Verify (signedData, keyLen + 6, buf + offset)) return;
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offset += identity->GetSignatureLen ();
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}
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// type specific part
size_t s = 0;
switch (m_StoreType)
{
case NETDB_STORE_TYPE_STANDARD_LEASESET2:
s = ReadStandardLS2TypeSpecificPart (buf + offset, len - offset);
break;
case NETDB_STORE_TYPE_META_LEASESET2:
s = ReadMetaLS2TypeSpecificPart (buf + offset, len - offset);
break;
default:
LogPrint (eLogWarning, "LeaseSet2: Unexpected store type ", (int)m_StoreType);
}
if (!s) return;
offset += s;
// verify signature
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bool verified = offlineVerifier ? VerifySignature (offlineVerifier, buf, len, offset) :
VerifySignature (identity, buf, len, offset);
SetIsValid (verified);
}
template<typename Verifier>
bool LeaseSet2::VerifySignature (Verifier& verifier, const uint8_t * buf, size_t len, size_t signatureOffset)
{
if (signatureOffset + verifier->GetSignatureLen () > len) return false;
// we assume buf inside DatabaseStore message, so buf[-1] is valid memory
// change it for signature verification, and restore back
uint8_t c = buf[-1];
const_cast<uint8_t *>(buf)[-1] = m_StoreType;
bool verified = verifier->Verify (buf - 1, signatureOffset + 1, buf + signatureOffset);
const_cast<uint8_t *>(buf)[-1] = c;
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if (!verified)
LogPrint (eLogWarning, "LeaseSet2: verification failed");
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return verified;
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}
size_t LeaseSet2::ReadStandardLS2TypeSpecificPart (const uint8_t * buf, size_t len)
{
size_t offset = 0;
// properties
uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
offset += propertiesLen; // skip for now. TODO: implement properties
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if (offset + 1 >= len) return 0;
// key sections
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int numKeySections = buf[offset]; offset++;
for (int i = 0; i < numKeySections; i++)
{
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uint16_t keyType = bufbe16toh (buf + offset); offset += 2; // encryption key type
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if (offset + 2 >= len) return 0;
uint16_t encryptionKeyLen = bufbe16toh (buf + offset); offset += 2;
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if (offset + encryptionKeyLen >= len) return 0;
if (!m_Encryptor && IsStoreLeases ()) // create encryptor with leases only, first key
{
auto encryptor = i2p::data::IdentityEx::CreateEncryptor (keyType, buf + offset);
m_Encryptor = encryptor; // TODO: atomic
}
offset += encryptionKeyLen;
}
// leases
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if (offset + 1 >= len) return 0;
int numLeases = buf[offset]; offset++;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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if (IsStoreLeases ())
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{
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UpdateLeasesBegin ();
for (int i = 0; i < numLeases; i++)
{
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if (offset + LEASE2_SIZE > len) return 0;
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Lease lease;
lease.tunnelGateway = buf + offset; offset += 32; // gateway
lease.tunnelID = bufbe32toh (buf + offset); offset += 4; // tunnel ID
lease.endDate = bufbe32toh (buf + offset)*1000LL; offset += 4; // end date
UpdateLease (lease, ts);
}
UpdateLeasesEnd ();
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}
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else
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offset += numLeases*LEASE2_SIZE; // 40 bytes per lease
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return offset;
}
size_t LeaseSet2::ReadMetaLS2TypeSpecificPart (const uint8_t * buf, size_t len)
{
size_t offset = 0;
// properties
uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
offset += propertiesLen; // skip for now. TODO: implement properties
// entries
if (offset + 1 >= len) return 0;
int numEntries = buf[offset]; offset++;
for (int i = 0; i < numEntries; i++)
{
if (offset + 40 >= len) return 0;
offset += 32; // hash
offset += 3; // flags
offset += 1; // cost
offset += 4; // expires
}
// revocations
if (offset + 1 >= len) return 0;
int numRevocations = buf[offset]; offset++;
for (int i = 0; i < numRevocations; i++)
{
if (offset + 32 > len) return 0;
offset += 32; // hash
}
return offset;
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}
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void LeaseSet2::ReadFromBufferEncrypted (const uint8_t * buf, size_t len)
{
size_t offset = 0;
// blinded key
uint16_t blindedKeyType = bufbe16toh (buf + offset); offset += 2;
std::unique_ptr<i2p::crypto::Verifier> blindedVerifier (i2p::data::IdentityEx::CreateVerifier (blindedKeyType));
if (!blindedVerifier) return;
auto blindedKeyLen = blindedVerifier->GetPublicKeyLen ();
if (offset + blindedKeyLen >= len) return;
blindedVerifier->SetPublicKey (buf + offset); offset += blindedKeyLen;
// expiration
if (offset + 8 >= len) return;
uint32_t timestamp = bufbe32toh (buf + offset); offset += 4; // published timestamp (seconds)
uint16_t expires = bufbe16toh (buf + offset); offset += 2; // expires (seconds)
SetExpirationTime ((timestamp + expires)*1000LL); // in milliseconds
uint16_t flags = bufbe16toh (buf + offset); offset += 2; // flags
std::unique_ptr<i2p::crypto::Verifier> offlineVerifier;
if (flags & 0x0001)
{
// offline key
if (offset + 6 >= len) return;
const uint8_t * signedData = buf + offset;
offset += 4; // expires timestamp
uint16_t keyType = bufbe16toh (buf + offset); offset += 2;
offlineVerifier.reset (i2p::data::IdentityEx::CreateVerifier (keyType));
if (!offlineVerifier) return;
auto keyLen = offlineVerifier->GetPublicKeyLen ();
if (offset + keyLen >= len) return;
offlineVerifier->SetPublicKey (buf + offset); offset += keyLen;
if (offset + blindedVerifier->GetSignatureLen () >= len) return;
if (!blindedVerifier->Verify (signedData, keyLen + 6, buf + offset)) return;
offset += blindedVerifier->GetSignatureLen ();
}
// outer ciphertext
if (offset + 2 > len) return;
uint16_t lenOuterCiphertext = bufbe16toh (buf + offset); offset += 2 + lenOuterCiphertext;
// verify signature
bool verified = offlineVerifier ? VerifySignature (offlineVerifier, buf, len, offset) :
VerifySignature (blindedVerifier, buf, len, offset);
SetIsValid (verified);
}
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void LeaseSet2::Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const
{
auto encryptor = m_Encryptor; // TODO: atomic
if (encryptor)
encryptor->Encrypt (data, encrypted, ctx, true);
}
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LocalLeaseSet::LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * encryptionPublicKey, std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels):
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m_ExpirationTime (0), m_Identity (identity)
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{
int num = tunnels.size ();
if (num > MAX_NUM_LEASES) num = MAX_NUM_LEASES;
// identity
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auto signingKeyLen = m_Identity->GetSigningPublicKeyLen ();
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m_BufferLen = m_Identity->GetFullLen () + 256 + signingKeyLen + 1 + num*LEASE_SIZE + m_Identity->GetSignatureLen ();
m_Buffer = new uint8_t[m_BufferLen];
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auto offset = m_Identity->ToBuffer (m_Buffer, m_BufferLen);
memcpy (m_Buffer + offset, encryptionPublicKey, 256);
offset += 256;
memset (m_Buffer + offset, 0, signingKeyLen);
offset += signingKeyLen;
// num leases
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m_Buffer[offset] = num;
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offset++;
// leases
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m_Leases = m_Buffer + offset;
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auto currentTime = i2p::util::GetMillisecondsSinceEpoch ();
for (int i = 0; i < num; i++)
{
memcpy (m_Buffer + offset, tunnels[i]->GetNextIdentHash (), 32);
offset += 32; // gateway id
htobe32buf (m_Buffer + offset, tunnels[i]->GetNextTunnelID ());
offset += 4; // tunnel id
uint64_t ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // 1 minute before expiration
ts *= 1000; // in milliseconds
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if (ts > m_ExpirationTime) m_ExpirationTime = ts;
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// make sure leaseset is newer than previous, but adding some time to expiration date
ts += (currentTime - tunnels[i]->GetCreationTime ()*1000LL)*2/i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT; // up to 2 secs
htobe64buf (m_Buffer + offset, ts);
offset += 8; // end date
}
// we don't sign it yet. must be signed later on
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}
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LocalLeaseSet::LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len):
m_ExpirationTime (0), m_Identity (identity)
{
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if (buf)
{
m_BufferLen = len;
m_Buffer = new uint8_t[m_BufferLen];
memcpy (m_Buffer, buf, len);
}
else
{
m_Buffer = nullptr;
m_BufferLen = 0;
}
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}
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bool LocalLeaseSet::IsExpired () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
return ts > m_ExpirationTime;
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}
bool LeaseSetBufferValidate(const uint8_t * ptr, size_t sz, uint64_t & expires)
{
IdentityEx ident(ptr, sz);
size_t size = ident.GetFullLen ();
if (size > sz)
{
LogPrint (eLogError, "LeaseSet: identity length ", size, " exceeds buffer size ", sz);
return false;
}
// encryption key
size += 256;
// signing key (unused)
size += ident.GetSigningPublicKeyLen ();
uint8_t numLeases = ptr[size];
++size;
if (!numLeases || numLeases > MAX_NUM_LEASES)
{
LogPrint (eLogError, "LeaseSet: incorrect number of leases", (int)numLeases);
return false;
}
const uint8_t * leases = ptr + size;
expires = 0;
/** find lease with the max expiration timestamp */
for (int i = 0; i < numLeases; i++)
{
leases += 36; // gateway + tunnel ID
uint64_t endDate = bufbe64toh (leases);
leases += 8; // end date
if(endDate > expires)
expires = endDate;
}
return ident.Verify(ptr, leases - ptr, leases);
}
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LocalLeaseSet2::LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity,
uint16_t keyType, uint16_t keyLen, const uint8_t * encryptionPublicKey,
std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels):
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LocalLeaseSet (identity, nullptr, 0)
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{
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// assume standard LS2
int num = tunnels.size ();
if (num > MAX_NUM_LEASES) num = MAX_NUM_LEASES;
m_BufferLen = identity->GetFullLen () + 4/*published*/ + 2/*expires*/ + 2/*flag*/ + 2/*properties len*/ +
1/*num keys*/ + 2/*key type*/ + 2/*key len*/ + keyLen/*key*/ + 1/*num leases*/ + num*LEASE2_SIZE + identity->GetSignatureLen ();
m_Buffer = new uint8_t[m_BufferLen + 1];
m_Buffer[0] = storeType;
// LS2 header
auto offset = identity->ToBuffer (m_Buffer + 1, m_BufferLen) + 1;
auto timestamp = i2p::util::GetSecondsSinceEpoch ();
htobe32buf (m_Buffer + offset, timestamp); offset += 4; // published timestamp (seconds)
uint8_t * expiresBuf = m_Buffer + offset; offset += 2; // expires, fill later
htobe16buf (m_Buffer + offset, 0); offset += 2; // flags
htobe16buf (m_Buffer + offset, 0); offset += 2; // properties len
// keys
m_Buffer[offset] = 1; offset++; // 1 key
htobe16buf (m_Buffer + offset, keyType); offset += 2; // key type
htobe16buf (m_Buffer + offset, keyLen); offset += 2; // key len
memcpy (m_Buffer + offset, encryptionPublicKey, keyLen); offset += keyLen; // key
// leases
uint32_t expirationTime = 0; // in seconds
m_Buffer[offset] = num; offset++; // num leases
for (int i = 0; i < num; i++)
{
memcpy (m_Buffer + offset, tunnels[i]->GetNextIdentHash (), 32);
offset += 32; // gateway id
htobe32buf (m_Buffer + offset, tunnels[i]->GetNextTunnelID ());
offset += 4; // tunnel id
auto ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // in seconds, 1 minute before expiration
if (ts > expirationTime) expirationTime = ts;
htobe32buf (m_Buffer + offset, ts);
offset += 4; // end date
}
// update expiration
SetExpirationTime (expirationTime*1000LL);
auto expires = expirationTime - timestamp;
htobe16buf (expiresBuf, expires > 0 ? expires : 0);
// we don't sign it yet. must be signed later on
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}
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}
}