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check length of garlic message

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orignal 2015-05-17 19:40:46 -04:00
parent 9510bba3b0
commit 2a59ae294d
1 changed files with 19 additions and 8 deletions
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27
Garlic.cpp
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@ -365,23 +365,34 @@ namespace garlic
{
uint8_t * buf = msg->GetPayload ();
uint32_t length = bufbe32toh (buf);
if (length > msg->GetLength ())
{
LogPrint (eLogError, "Garlic message length ", length, " exceeds I2NP message length ", msg->GetLength ());
DeleteI2NPMessage (msg);
return;
}
buf += 4; // length
auto it = m_Tags.find (SessionTag(buf));
if (it != m_Tags.end ())
{
// tag found. Use AES
uint8_t iv[32]; // IV is first 16 bytes
CryptoPP::SHA256().CalculateDigest(iv, buf, 32);
it->second->SetIV (iv);
it->second->Decrypt (buf + 32, length - 32, buf + 32);
HandleAESBlock (buf + 32, length - 32, it->second, msg->from);
m_Tags.erase (it); // tag might be used only once
if (length >= 32)
{
uint8_t iv[32]; // IV is first 16 bytes
CryptoPP::SHA256().CalculateDigest(iv, buf, 32);
it->second->SetIV (iv);
it->second->Decrypt (buf + 32, length - 32, buf + 32);
HandleAESBlock (buf + 32, length - 32, it->second, msg->from);
}
else
LogPrint (eLogError, "Garlic message length ", length, " is less than 32 bytes");
m_Tags.erase (it); // tag might be used only once
}
else
{
// tag not found. Use ElGamal
ElGamalBlock elGamal;
if (i2p::crypto::ElGamalDecrypt (GetEncryptionPrivateKey (), buf, (uint8_t *)&elGamal, true))
if (length >= 514 && i2p::crypto::ElGamalDecrypt (GetEncryptionPrivateKey (), buf, (uint8_t *)&elGamal, true))
{
auto decryption = std::make_shared<i2p::crypto::CBCDecryption>();
decryption->SetKey (elGamal.sessionKey);
@ -392,7 +403,7 @@ namespace garlic
HandleAESBlock (buf + 514, length - 514, decryption, msg->from);
}
else
LogPrint ("Failed to decrypt garlic");
LogPrint (eLogError, "Failed to decrypt garlic");
}
DeleteI2NPMessage (msg);