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implement DatabaseLookupTagSet

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orignal 2020-09-15 19:39:18 -04:00
parent d0d71c93af
commit 2b0d1a2190
3 changed files with 70 additions and 4 deletions
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50
libi2pd/ECIESX25519AEADRatchetSession.cpp
View file

@ -99,6 +99,56 @@ namespace garlic
m_ExpirationTimestamp = i2p::util::GetSecondsSinceEpoch () + ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT;
}
bool RatchetTagSet::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);
}
DatabaseLookupTagSet::DatabaseLookupTagSet (GarlicDestination * destination, const uint8_t * key):
RatchetTagSet (nullptr), m_Destination (destination)
{
memcpy (m_Key, key, 32);
Expire ();
}
bool DatabaseLookupTagSet::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: Lookup reply AEAD decryption failed");
return false;
}
// we assume 1 I2NP block with delivery type local
if (offset + 3 > len)
{
LogPrint (eLogWarning, "Garlic: Lookup reply is too short ", len);
return false;
}
if (buf[offset] != eECIESx25519BlkGalicClove)
{
LogPrint (eLogWarning, "Garlic: Lookup reply unexpected block ", (int)buf[offset]);
return false;
}
offset++;
auto size = bufbe16toh (buf + offset);
offset += 2;
if (offset + size > len)
{
LogPrint (eLogWarning, "Garlic: Lookup reply block is too long ", size);
return false;
}
if (m_Destination)
m_Destination->HandleECIESx25519GarlicClove (buf + offset, size);
return true;
}
ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner, bool attachLeaseSet):
GarlicRoutingSession (owner, attachLeaseSet)
{

21
libi2pd/ECIESX25519AEADRatchetSession.h
View file

@ -40,7 +40,7 @@ namespace garlic
// - 16 /* I2NP header */ - 16 /* poly hash */ - 8 /* tag */ - 4 /* garlic length */
class ECIESX25519AEADRatchetSession;
class RatchetTagSet
class RatchetTagSet: public std::enable_shared_from_this<RatchetTagSet>
{
public:
@ -61,7 +61,9 @@ namespace garlic
void Expire ();
bool IsExpired (uint64_t ts) const { return m_ExpirationTimestamp && ts > m_ExpirationTimestamp; };
bool IsIndexExpired (int index) const { return m_Session.expired () || index < m_TrimBehindIndex; };
virtual bool IsIndexExpired (int index) const { return m_Session.expired () || index < m_TrimBehindIndex; };
virtual bool HandleNextMessage (uint8_t * buf, size_t len, int index);
private:
@ -94,6 +96,21 @@ namespace garlic
std::shared_ptr<ECIESX25519AEADRatchetSession> m_DummySession; // we need a strong pointer for NS
};
class DatabaseLookupTagSet: public RatchetTagSet
{
public:
DatabaseLookupTagSet (GarlicDestination * destination, const uint8_t * key);
bool IsIndexExpired (int index) const { return false; };
bool HandleNextMessage (uint8_t * buf, size_t len, int index);
private:
GarlicDestination * m_Destination;
uint8_t m_Key[32];
};
enum ECIESx25519BlockType
{

3
libi2pd/Garlic.cpp
View file

@ -507,8 +507,7 @@ namespace garlic
if (it1 != m_ECIESx25519Tags.end ())
{
found = true;
auto session = it1->second.tagset->GetSession ();
if (!session || !session->HandleNextMessage (buf, length, it1->second.tagset, it1->second.index))
if (!it1->second.tagset->HandleNextMessage (buf, length, it1->second.index))
LogPrint (eLogError, "Garlic: can't handle ECIES-X25519-AEAD-Ratchet message");
m_ECIESx25519Tags.erase (it1);
}