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check garlic message payload hash

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orignal 2014-01-16 08:08:28 -05:00
parent 075650b6d3
commit bc9b355d5d
3 changed files with 25 additions and 12 deletions
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31
Garlic.cpp
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@ -17,13 +17,7 @@ namespace garlic
GarlicRoutingSession::GarlicRoutingSession (const i2p::data::RoutingDestination * destination, int numTags): GarlicRoutingSession::GarlicRoutingSession (const i2p::data::RoutingDestination * destination, int numTags):
m_Destination (destination), m_NumTags (numTags), m_NextTag (-1), m_SessionTags (0) m_Destination (destination), m_NumTags (numTags), m_NextTag (-1), m_SessionTags (0)
{ {
m_Rnd.GenerateBlock (m_SessionKey, 32); m_SessionTags = new uint8_t[m_NumTags*32];
if (m_NumTags > 0)
{
m_SessionTags = new uint8_t[m_NumTags*32];
for (int i = 0; i < m_NumTags; i++)
m_Rnd.GenerateBlock (m_SessionTags + i*32, 32);
}
} }
GarlicRoutingSession::~GarlicRoutingSession () GarlicRoutingSession::~GarlicRoutingSession ()
@ -36,8 +30,13 @@ namespace garlic
I2NPMessage * m = NewI2NPMessage (); I2NPMessage * m = NewI2NPMessage ();
size_t len = 0; size_t len = 0;
uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
if (m_NextTag < 0) // new session if (m_NextTag < 0 || m_NextTag >= m_NumTags) // new session
{ {
// create new session tags and session key
m_Rnd.GenerateBlock (m_SessionKey, 32);
for (int i = 0; i < m_NumTags; i++)
m_Rnd.GenerateBlock (m_SessionTags + i*32, 32);
// create ElGamal block // create ElGamal block
ElGamalBlock elGamal; ElGamalBlock elGamal;
memcpy (elGamal.sessionKey, m_SessionKey, 32); memcpy (elGamal.sessionKey, m_SessionKey, 32);
@ -268,12 +267,26 @@ namespace garlic
m_SessionTags[std::string ((const char *)(buf + i*32), 32)] = std::string ((const char *)sessionKey, 32); m_SessionTags[std::string ((const char *)(buf + i*32), 32)] = std::string ((const char *)sessionKey, 32);
buf += tagCount*32; buf += tagCount*32;
uint32_t payloadSize = be32toh (*(uint32_t *)buf); uint32_t payloadSize = be32toh (*(uint32_t *)buf);
if (payloadSize > len)
{
LogPrint ("Unxpected payload size ", payloadSize);
return;
}
buf += 4; buf += 4;
buf += 32;// payload hash. TODO: verify it uint8_t * payloadHash = buf;
buf += 32;// payload hash.
if (*buf) // session key? if (*buf) // session key?
buf += 32; // new session key buf += 32; // new session key
buf++; // flag buf++; // flag
// payload // payload
uint8_t hash[32];
CryptoPP::SHA256().CalculateDigest(hash, buf, payloadSize);
if (memcmp (hash, payloadHash, 32)) // payload hash doesn't match
{
LogPrint ("Wrong payload hash");
return;
}
HandleGarlicPayload (buf, payloadSize); HandleGarlicPayload (buf, payloadSize);
} }

4
Streaming.cpp
View file

@ -163,7 +163,7 @@ namespace stream
size++; // resend delay size++; // resend delay
*(uint16_t *)(packet + size) = 0; // nof flags set *(uint16_t *)(packet + size) = 0; // nof flags set
size += 2; // flags size += 2; // flags
*(uint16_t *)(packet + size) = 0; // nof flags set *(uint16_t *)(packet + size) = 0; // no options
size += 2; // options size size += 2; // options size
I2NPMessage * msg = i2p::garlic::routing.WrapSingleMessage (m_RemoteLeaseSet, I2NPMessage * msg = i2p::garlic::routing.WrapSingleMessage (m_RemoteLeaseSet,
@ -207,7 +207,7 @@ namespace stream
size++; // resend delay size++; // resend delay
*(uint16_t *)(packet + size) = PACKET_FLAG_CLOSE | PACKET_FLAG_SIGNATURE_INCLUDED; *(uint16_t *)(packet + size) = PACKET_FLAG_CLOSE | PACKET_FLAG_SIGNATURE_INCLUDED;
size += 2; // flags size += 2; // flags
*(uint16_t *)(packet + size) = 40; // 40 bytes signature *(uint16_t *)(packet + size) = htobe16 (40); // 40 bytes signature
size += 2; // options size size += 2; // options size
uint8_t * signature = packet + size; uint8_t * signature = packet + size;
memset (packet + size, 0, 40); memset (packet + size, 0, 40);

2
TunnelEndpoint.cpp
View file

@ -143,7 +143,7 @@ namespace tunnel
void TunnelEndpoint::HandleNextMessage (const TunnelMessageBlock& msg) void TunnelEndpoint::HandleNextMessage (const TunnelMessageBlock& msg)
{ {
LogPrint ("TunnelMessage: handle fragment of ", msg.data->GetLength ()," bytes"); LogPrint ("TunnelMessage: handle fragment of ", msg.data->GetLength ()," bytes. Msg type ", (int)msg.data->GetHeader()->typeID);
switch (msg.deliveryType) switch (msg.deliveryType)
{ {
case eDeliveryTypeLocal: case eDeliveryTypeLocal: