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check identity and signature length for SessionConfirmed

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orignal 2021-05-03 19:05:25 -04:00
parent 7f143a7f23
commit 0b9cb4e75b
1 changed files with 13 additions and 3 deletions
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16
libi2pd/SSUSession.cpp
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@ -321,12 +321,17 @@ namespace transport
auto headerSize = GetSSUHeaderSize (buf);
if (headerSize >= len)
{
LogPrint (eLogError, "SSU: Session confirmed header size ", len, " exceeds packet length ", len);
LogPrint (eLogError, "SSU: Session confirmed header size ", headerSize, " exceeds packet length ", len);
return;
}
const uint8_t * payload = buf + headerSize;
payload++; // identity fragment info
uint16_t identitySize = bufbe16toh (payload);
if (identitySize + headerSize + 7 > len) // 7 = fragment info + fragment size + signed on time
{
LogPrint (eLogError, "SSU: Session confirmed identity size ", identitySize, " exceeds packet length ", len);
return;
}
payload += 2; // size of identity fragment
auto identity = std::make_shared<i2p::data::IdentityEx> (payload, identitySize);
auto existing = i2p::data::netdb.FindRouter (identity->GetIdentHash ()); // check if exists already
@ -344,10 +349,15 @@ namespace transport
if (m_SignedData)
m_SignedData->Insert (payload, 4); // insert Alice's signed on time
payload += 4; // signed-on time
size_t paddingSize = (payload - buf) + m_RemoteIdentity->GetSignatureLen ();
paddingSize &= 0x0F; // %16
size_t fullSize = (payload - buf) + m_RemoteIdentity->GetSignatureLen ();
size_t paddingSize = fullSize & 0x0F; // %16
if (paddingSize > 0) paddingSize = 16 - paddingSize;
payload += paddingSize;
if (fullSize + paddingSize > len)
{
LogPrint (eLogError, "SSU: Session confirmed message is too short ", len);
return;
}
// verify signature
if (m_SignedData && m_SignedData->Verify (m_RemoteIdentity, payload))
{