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Handle CreateLeaseSet2 I2CP message for encrypted leasesets

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orignal 2019-04-11 14:06:53 -04:00
parent 64d800427f
commit d248343517
4 changed files with 49 additions and 15 deletions
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42
libi2pd_client/I2CP.cpp
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@ -70,7 +70,9 @@ namespace client
void I2CPDestination::LeaseSet2Created (uint8_t storeType, const uint8_t * buf, size_t len)
{
auto ls = std::make_shared<i2p::data::LocalLeaseSet2> (storeType, m_Identity, buf, len);
auto ls = (storeType == i2p::data::NETDB_STORE_TYPE_ENCRYPTED_LEASESET2) ?
std::make_shared<i2p::data::LocalEncryptedLeaseSet2> (m_Identity, buf, len):
std::make_shared<i2p::data::LocalLeaseSet2> (storeType, m_Identity, buf, len);
ls->SetExpirationTime (m_LeaseSetExpirationTime);
SetLeaseSet (ls);
}
@ -528,21 +530,35 @@ namespace client
if (m_Destination)
{
uint8_t storeType = buf[offset]; offset++; // store type
// TODO: parse LS2 and obtain correct private keys lengths
size_t signingPrivateKeyLength = 0, encryptionPrivateKeyLength = 0;
if (storeType != i2p::data::NETDB_STORE_TYPE_META_LEASESET2) // no private keys for meta
i2p::data::LeaseSet2 ls (storeType, buf + offset, len - offset); // outer layer only for encrypted
if (!ls.IsValid ())
{
signingPrivateKeyLength = m_Destination->GetIdentity ()->GetSigningPrivateKeyLen (); // no offline keys
encryptionPrivateKeyLength = 256; // ElGamal only
if (len < offset + signingPrivateKeyLength + encryptionPrivateKeyLength)
LogPrint (eLogError, "I2CP: invalid LeaseSet2 of type ", storeType);
return;
}
offset += ls.GetBufferLen ();
// private keys
int numPrivateKeys = buf[offset]; offset++;
uint16_t currentKeyType = 0;
const uint8_t * currentKey = nullptr;
for (int i = 0; i < numPrivateKeys; i++)
{
if (offset + 4 > len) return;
uint16_t keyType = bufbe16toh (buf + offset); offset += 2; // encryption type
uint16_t keyLen = bufbe16toh (buf + offset); offset += 2; // private key length
if (offset + keyLen > len) return;
if (keyType > currentKeyType)
{
LogPrint (eLogError, "I2CP: CreateLeaseSet2 message is too short ", len);
return;
currentKeyType = keyType;
currentKey = buf + offset;
}
m_Destination->SetEncryptionPrivateKey (buf + len - encryptionPrivateKeyLength);
// ignore signing private key
}
m_Destination->LeaseSet2Created (storeType, buf + offset, len - offset - signingPrivateKeyLength - encryptionPrivateKeyLength);
offset += keyLen;
}
// TODO: support multiple keys
if (currentKey)
m_Destination->SetEncryptionPrivateKey (currentKey);
m_Destination->LeaseSet2Created (storeType, ls.GetBuffer (), ls.GetBufferLen ());
}
}
else