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Merge PR #812: Cedar/Proto_OpenVPN.c: don't release data channel if it's not established, improve logic and debug messages

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Davide Beatrici 2018-11-20 05:00:49 +01:00 committed by GitHub
commit 7f29f8df85
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 53 additions and 66 deletions
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119
src/Cedar/Proto_OpenVPN.c
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@ -509,38 +509,38 @@ void OvsProceccRecvPacket(OPENVPN_SERVER *s, UDPPACKET *p, UINT protocol)
return;
}
if (recv_packet->OpCode != OPENVPN_P_DATA_V1 && recv_packet->MySessionId != 0)
{
Debug("RECV PACKET: %u %I64u\n", recv_packet->KeyId, recv_packet->MySessionId);
}
if (recv_packet->OpCode != OPENVPN_P_DATA_V1)
{
Debug(" PKT %u %u\n", recv_packet->OpCode, recv_packet->KeyId);
}
c = se->Channels[recv_packet->KeyId];
if (recv_packet->OpCode != OPENVPN_P_DATA_V1)
{
// Control packet
Debug("OvsProceccRecvPacket(): Received control packet. PacketId: %u, OpCode: %u, KeyId: %u, MySessionId: %I64u\n",
recv_packet->PacketId, recv_packet->OpCode, recv_packet->KeyId, recv_packet->MySessionId);
if (recv_packet->OpCode == OPENVPN_P_CONTROL_HARD_RESET_CLIENT_V2 ||
recv_packet->OpCode == OPENVPN_P_CONTROL_SOFT_RESET_V1)
{
// Connection request packet
if (se->Channels[recv_packet->KeyId] != NULL)
if (c != NULL && c->Status == OPENVPN_CHANNEL_STATUS_ESTABLISHED)
{
// Release when there is a channel data already
// If there's already an established data channel, release it
OvsFreeChannel(se->Channels[recv_packet->KeyId]);
se->Channels[recv_packet->KeyId] = NULL;
c = se->Channels[recv_packet->KeyId] = NULL;
Debug("OvsProceccRecvPacket(): Released established data channel: %u\n", recv_packet->KeyId);
}
// Create a new channel
c = OvsNewChannel(se, recv_packet->KeyId);
if (se->ClientSessionId == 0)
if (c == NULL)
{
se->ClientSessionId = recv_packet->MySessionId;
// Create a new channel
c = OvsNewChannel(se, recv_packet->KeyId);
if (se->ClientSessionId == 0)
{
se->ClientSessionId = recv_packet->MySessionId;
}
se->Channels[recv_packet->KeyId] = c;
Debug("OvsProceccRecvPacket(): Created a new channel: %u\n", recv_packet->KeyId);
OvsLog(s, se, c, "LO_NEW_CHANNEL");
}
se->Channels[recv_packet->KeyId] = c;
Debug("OpenVPN New Channel :%u\n", recv_packet->KeyId);
OvsLog(s, se, c, "LO_NEW_CHANNEL");
}
/* else if (recv_packet->OpCode == OPENVPN_P_CONTROL_SOFT_RESET_V1)
{
@ -553,16 +553,8 @@ void OvsProceccRecvPacket(OPENVPN_SERVER *s, UDPPACKET *p, UINT protocol)
OvsSendPacketNow(s, se, p);
OvsFreePacket(p);
}*/
else
{
// Packet other than the connection request
if (se->Channels[recv_packet->KeyId] != NULL)
{
c = se->Channels[recv_packet->KeyId];
}
}
*/
if (c != NULL)
{
// Delete the send packet list by looking the packet ID in the ACK list of arrived packet
@ -572,7 +564,6 @@ void OvsProceccRecvPacket(OPENVPN_SERVER *s, UDPPACKET *p, UINT protocol)
{
// Add the Packet ID of arrived packet to the list
InsertIntDistinct(c->AckReplyList, recv_packet->PacketId);
Debug("Recv Packet ID (c=%u): %u\n", c->KeyId, recv_packet->PacketId);
if ((recv_packet->PacketId > c->MaxRecvPacketId)
|| (recv_packet->OpCode == OPENVPN_P_CONTROL_HARD_RESET_CLIENT_V2)
@ -589,48 +580,44 @@ void OvsProceccRecvPacket(OPENVPN_SERVER *s, UDPPACKET *p, UINT protocol)
else
{
// Data packet
if (se->Channels[recv_packet->KeyId] != NULL)
if (c != NULL && c->Status == OPENVPN_CHANNEL_STATUS_ESTABLISHED)
{
OPENVPN_CHANNEL *c = se->Channels[recv_packet->KeyId];
if (c->Status == OPENVPN_CHANNEL_STATUS_ESTABLISHED)
UINT size;
UCHAR *data = s->TmpBuf;
if (c->CipherDecrypt->IsAeadCipher)
{
UINT size;
UCHAR *data = s->TmpBuf;
if (c->CipherDecrypt->IsAeadCipher)
// Update variable part (packet ID) of IV
Copy(c->IvRecv, recv_packet->Data, sizeof(recv_packet->PacketId));
// Decrypt
size = OvsDecrypt(c->CipherDecrypt, NULL, c->IvRecv, data, recv_packet->Data + sizeof(UINT), recv_packet->DataSize - sizeof(UINT));
}
else
{
// Decrypt
size = OvsDecrypt(c->CipherDecrypt, c->MdRecv, c->IvRecv, data, recv_packet->Data, recv_packet->DataSize);
// Seek buffer after the packet ID
data += sizeof(UINT);
size -= sizeof(UINT);
}
// Update of last communication time
se->LastCommTick = s->Now;
if (size < sizeof(ping_signature) || Cmp(data, ping_signature, sizeof(ping_signature)) != 0)
{
// Receive a packet!
if (se->Ipc != NULL)
{
// Update variable part (packet ID) of IV
Copy(c->IvRecv, recv_packet->Data, sizeof(recv_packet->PacketId));
// Decrypt
size = OvsDecrypt(c->CipherDecrypt, NULL, c->IvRecv, data, recv_packet->Data + sizeof(UINT), recv_packet->DataSize - sizeof(UINT));
}
else
{
// Decrypt
size = OvsDecrypt(c->CipherDecrypt, c->MdRecv, c->IvRecv, data, recv_packet->Data, recv_packet->DataSize);
// Seek buffer after the packet ID
data += sizeof(UINT);
size -= sizeof(UINT);
}
// Update of last communication time
se->LastCommTick = s->Now;
if (size < sizeof(ping_signature) || Cmp(data, ping_signature, sizeof(ping_signature)) != 0)
{
// Receive a packet!
if (se->Ipc != NULL)
switch (se->Mode)
{
switch (se->Mode)
{
case OPENVPN_MODE_L2: // Send an Ethernet packet to a session
IPCSendL2(se->Ipc, data, size);
break;
case OPENVPN_MODE_L3: // Send an IPv4 packet to a session
IPCSendIPv4(se->Ipc, data, size);
break;
}
case OPENVPN_MODE_L2: // Send an Ethernet packet to a session
IPCSendL2(se->Ipc, data, size);
break;
case OPENVPN_MODE_L3: // Send an IPv4 packet to a session
IPCSendIPv4(se->Ipc, data, size);
break;
}
}
}