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Preliminary (untested) EAP-TLS implementation

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This commit is contained in:
Evengard 2020-05-02 09:38:08 +03:00
parent a65c436e8f
commit 9f2a5cecf3
3 changed files with 457 additions and 46 deletions
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1
src/Cedar/CedarType.h
View File

@ -501,6 +501,7 @@ typedef struct PPP_IPV6OPTION PPP_IPV6OPTION;
typedef struct PPP_REQUEST_RESEND PPP_REQUEST_RESEND;
typedef struct PPP_DELAYED_PACKET PPP_DELAYED_PACKET;
typedef struct PPP_EAP PPP_EAP;
typedef struct PPP_EAP_TLS_CONTEXT PPP_EAP_TLS_CONTEXT;
// ==============================================================

467
src/Cedar/Proto_PPP.c
View File

@ -35,6 +35,8 @@ void PPPThread(THREAD *thread, void *param)
p->IPv4_State = PPP_PROTO_STATUS_CLOSED;
p->IPv6_State = PPP_PROTO_STATUS_CLOSED;
p->Eap_Protocol = PPP_UNSPECIFIED;
p->Mru1 = p->Mru2 = PPP_MRU_DEFAULT;
p->RecvPacketList = NewList(NULL);
p->SentReqPacketList = NewList(NULL);
@ -229,6 +231,45 @@ void PPPThread(THREAD *thread, void *param)
Debug("Unprocessed and unrejected packet, protocol = 0x%x\n", p->CurrentPacket->Protocol);
}
}
else if (p->PPPStatus == PPP_STATUS_BEFORE_AUTH && p->AuthProtocol == PPP_PROTOCOL_EAP)
{
PPP_LCP* lcpEap;
PPP_EAP* eapPacket;
UCHAR* welcomeMessage = "Welcome to the SoftEther VPN server!";
UCHAR flags = 0;
// We got to start EAP when we got no LCP packets from the client on previous iteration
// which means we parsed all the client requests and responses
switch (p->Eap_Protocol)
{
case PPP_EAP_TYPE_TLS:
// Sending TLS Start...
flags |= 1 << 2;
lcpEap = BuildEAPTlsRequest(p->Eap_PacketId++, 0, flags);
PPPSetStatus(p, PPP_STATUS_AUTHENTICATING);
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcpEap))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
break;
case PPP_EAP_TYPE_IDENTITY:
default: // We treat the unspecified protocol as the IDENTITY protocol
p->Eap_Protocol = PPP_EAP_TYPE_IDENTITY;
lcpEap = BuildEAPPacketEx(PPP_EAP_CODE_REQUEST, p->Eap_PacketId++, PPP_EAP_TYPE_IDENTITY, sizeof(welcomeMessage));
eapPacket = lcpEap->Data;
Copy(eapPacket->Data, welcomeMessage, sizeof(welcomeMessage));
PPPSetStatus(p, PPP_STATUS_AUTHENTICATING);
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcpEap))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
break;
}
}
else if (p->PPPStatus == PPP_STATUS_BEFORE_AUTH && p->AuthProtocol == PPP_PROTOCOL_CHAP)
{
// We got to start CHAP when we got no LCP packets from the client on previous iteration
@ -247,14 +288,12 @@ void PPPThread(THREAD *thread, void *param)
if (p->PPPStatus == PPP_STATUS_CONNECTED && !authReqSent)
{
// MSCHAPv2 code
// EAP code
PPP_LCP *c = NewPPPLCP(PPP_LCP_CODE_REQ, 0);
UCHAR ms_chap_v2_code[3];
WRITE_USHORT(ms_chap_v2_code, PPP_LCP_AUTH_CHAP);
ms_chap_v2_code[2] = PPP_CHAP_ALG_MS_CHAP_V2;
USHORT eap_code = PPP_LCP_AUTH_EAP;
Debug("Request MSCHAPv2\n");
Add(c->OptionList, NewPPPOption(PPP_LCP_OPTION_AUTH, ms_chap_v2_code, sizeof(ms_chap_v2_code)));
Debug("Request EAP\n");
Add(c->OptionList, NewPPPOption(PPP_LCP_OPTION_AUTH, &eap_code, sizeof(eap_code)));
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_LCP, c))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
@ -368,7 +407,7 @@ void PPPThread(THREAD *thread, void *param)
}
else
{
WaitForTubes(tubes, 1, 100);
WaitForTubes(tubes, 1, 1000); // Increasing timeout to make the ticks a bit slower
}
if (IsTubeConnected(p->TubeRecv) == false || IsTubeConnected(p->TubeSend) == false)
@ -479,7 +518,7 @@ PPP_SESSION *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *se
p = ZeroMalloc(sizeof(PPP_SESSION));
p->EnableMSCHAPv2 = true;
p->AuthProtocol = NULL;
p->AuthProtocol = PPP_UNSPECIFIED;
p->MsChapV2_ErrorCode = 691;
p->EapClient = NULL;
@ -825,7 +864,37 @@ bool PPPProcessLCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req
WHERE;
return false;
}
if (opt->DataSize == sizeof(ms_chap_v2_code) && Cmp(opt->Data, ms_chap_v2_code, opt->DataSize) == 0)
if (opt->DataSize == sizeof(USHORT) && *((USHORT*)(opt->Data)) == Endian16(PPP_LCP_AUTH_EAP))
{
// Try to request MS-CHAPv2 then
if (!isAccepted)
{
UINT64 offer = 0;
PPP_LCP* c = NewPPPLCP(PPP_LCP_CODE_REQ, 0);
UCHAR ms_chap_v2_code[3];
WRITE_USHORT(ms_chap_v2_code, PPP_LCP_AUTH_CHAP);
ms_chap_v2_code[2] = PPP_CHAP_ALG_MS_CHAP_V2;
Copy(&offer, ms_chap_v2_code, sizeof(ms_chap_v2_code));
Debug("NACK proto with code = 0x%x, cypher = 0x%x, offered cypher = 0x%x\n", pp->Lcp->Code, *((USHORT*)(opt->Data)), offer);
Debug("Request MSCHAPv2\n");
Add(c->OptionList, NewPPPOption(PPP_LCP_OPTION_AUTH, &ms_chap_v2_code, sizeof(ms_chap_v2_code)));
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_LCP, c))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
}
else
{
p->AuthProtocol = PPP_PROTOCOL_EAP;
Debug("Setting BEFORE_AUTH from ACK on LCP response parse on EAP accept\n");
PPPSetStatus(p, PPP_STATUS_BEFORE_AUTH);
}
}
else if (opt->DataSize == sizeof(ms_chap_v2_code) && Cmp(opt->Data, ms_chap_v2_code, opt->DataSize) == 0)
{
// Try to request PAP then
if (!isAccepted || !p->EnableMSCHAPv2)
@ -844,7 +913,7 @@ bool PPPProcessLCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req
return false;
}
}
else if (p->AuthProtocol == NULL)
else if (p->AuthProtocol == PPP_UNSPECIFIED)
{
p->AuthProtocol = PPP_PROTOCOL_CHAP;
Debug("Setting BEFORE_AUTH from ACK on LCP response parse on CHAP accept\n");
@ -866,7 +935,7 @@ bool PPPProcessLCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req
WHERE;
return false;
}
else if (p->AuthProtocol == NULL)
else if (p->AuthProtocol == PPP_UNSPECIFIED)
{
p->AuthProtocol = PPP_PROTOCOL_PAP;
Debug("Setting BEFORE_AUTH from ACK on LCP response parse on PAP accept\n");
@ -1067,24 +1136,58 @@ bool PPPProcessIPCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *re
// Process EAP responses
bool PPPProcessEAPResponsePacket(PPP_SESSION* p, PPP_PACKET* pp, PPP_PACKET* req)
{
PPP_EAP* eap_packet = pp->Lcp->Data;
switch (eap_packet->Type)
if (pp->Lcp->DataSize >= 1)
{
case PPP_EAP_TYPE_IDENTITY:
/// TODO: implement identity response processing
break;
case PPP_EAP_TYPE_NOTIFICATION:
// Basically this is just an acknoweldgment that the notification was accepted by the client. Nothing to do here...
break;
case PPP_EAP_TYPE_NAK:
/// TODO: implement alternative EAP protocol selection based on received NAK
break;
case PPP_EAP_TYPE_TLS:
/// TODO: implement EAP-TLS protocol here
break;
default:
Debug("We got an unexpected EAP response packet! Ignoring...\n");
break;
PPP_EAP* eap_packet = pp->Lcp->Data;
UINT eap_datasize = pp->Lcp->DataSize - 1;
UINT64 offer = 0;
PPP_LCP* c;
UCHAR ms_chap_v2_code[3];
WRITE_USHORT(ms_chap_v2_code, PPP_LCP_AUTH_CHAP);
ms_chap_v2_code[2] = PPP_CHAP_ALG_MS_CHAP_V2;
switch (eap_packet->Type)
{
case PPP_EAP_TYPE_IDENTITY:
Copy(p->Eap_Identity, eap_packet->Data, MIN(MAX_SIZE, eap_datasize));
// As we received the identity packet, we switch back to BEFORE_AUTH and switch to the EAP_TLS proto to send the TlsStart packet on the next tick
p->Eap_Protocol = PPP_EAP_TYPE_TLS;
PPPSetStatus(p, PPP_STATUS_BEFORE_AUTH);
break;
case PPP_EAP_TYPE_NOTIFICATION:
// Basically this is just an acknoweldgment that the notification was accepted by the client. Nothing to do here...
break;
case PPP_EAP_TYPE_NAK:
/// TODO: implement alternative EAP protocol selection based on received NAK
// For now just fallback to auth protocol selection to try to select MSCHAP or PAP
Debug("Got a EAP_NAK, abandoning EAP protocol\n");
PPPRejectUnsupportedPacketEx(p, pp, true);
PPPSetStatus(p, PPP_STATUS_CONNECTED);
c = NewPPPLCP(PPP_LCP_CODE_REQ, 0);
Copy(&offer, ms_chap_v2_code, sizeof(ms_chap_v2_code));
Debug("Request MSCHAPv2 from EAP NAK\n");
Add(c->OptionList, NewPPPOption(PPP_LCP_OPTION_AUTH, &ms_chap_v2_code, sizeof(ms_chap_v2_code)));
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_LCP, c))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
break;
case PPP_EAP_TYPE_TLS:
PPPProcessEAPTlsResponse(p, eap_packet, eap_datasize);
break;
default:
Debug("We got an unexpected EAP response packet! Ignoring...\n");
break;
}
}
else
{
// Means we got a Success or Failure packet...
Debug("We got a CODE %i from client with zero size EAP structure, that shouldn't be happening!\n", pp->Lcp->Code);
}
return false;
}
@ -1134,6 +1237,7 @@ bool PPPProcessLCPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp)
USHORT NegotiatedMRU = PPP_UNSPECIFIED;
// MSCHAPv2 code
UCHAR ms_chap_v2_code[3];
USHORT eap_code = PPP_LCP_AUTH_EAP;
WRITE_USHORT(ms_chap_v2_code, PPP_LCP_AUTH_CHAP);
ms_chap_v2_code[2] = PPP_CHAP_ALG_MS_CHAP_V2;
@ -1148,22 +1252,27 @@ bool PPPProcessLCPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp)
{
case PPP_LCP_OPTION_AUTH:
t->IsSupported = true;
if (t->DataSize == sizeof(USHORT) && *((USHORT*)t->Data) == Endian16(PPP_LCP_AUTH_PAP) && p->AuthProtocol != PPP_PROTOCOL_CHAP)
if (t->DataSize == sizeof(USHORT) && *((USHORT*)t->Data) == Endian16(PPP_LCP_AUTH_EAP) && p->AuthProtocol == PPP_UNSPECIFIED)
{
t->IsAccepted = true;
NegotiatedAuthProto = PPP_PROTOCOL_EAP;
}
else if (t->DataSize == sizeof(USHORT) && *((USHORT*)t->Data) == Endian16(PPP_LCP_AUTH_PAP) && p->AuthProtocol == PPP_UNSPECIFIED)
{
t->IsAccepted = true;
NegotiatedAuthProto = PPP_PROTOCOL_PAP;
}
else if (t->DataSize == sizeof(ms_chap_v2_code) && Cmp(t->Data, ms_chap_v2_code, t->DataSize) == 0)
else if (t->DataSize == sizeof(ms_chap_v2_code) && Cmp(t->Data, ms_chap_v2_code, t->DataSize) == 0 && p->AuthProtocol == PPP_UNSPECIFIED)
{
t->IsAccepted = true;
NegotiatedAuthProto = PPP_PROTOCOL_CHAP;
}
else
{
// We're recommending MSCHAPv2 by default as a more secure algo
// We're recommending EAP by default as a more secure algo
t->IsAccepted = false;
t->AltDataSize = sizeof(ms_chap_v2_code);
Copy(t->AltData, ms_chap_v2_code, sizeof(ms_chap_v2_code));
t->AltDataSize = sizeof(eap_code);
Copy(t->AltData, &eap_code, sizeof(eap_code));
}
break;
case PPP_LCP_OPTION_MRU:
@ -1219,7 +1328,7 @@ bool PPPProcessLCPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp)
if (NegotiatedAuthProto != PPP_UNSPECIFIED)
{
if (p->AuthProtocol == NULL)
if (p->AuthProtocol == PPP_UNSPECIFIED)
{
p->AuthProtocol = NegotiatedAuthProto;
PPPSetStatus(p, PPP_STATUS_BEFORE_AUTH);
@ -1407,7 +1516,7 @@ bool PPPProcessPAPRequestPacket(PPP_SESSION *p, PPP_PACKET* pp)
return false;
}
return p->AuthOk;
}
@ -1701,7 +1810,7 @@ bool PPPProcessIPCPRequestPacket(PPP_SESSION *p, PPP_PACKET* pp)
// We will delay this packet ACK and send the server IP first, then wait for a reparse
// it is kind of dirty but fixes issues on some clients (namely VPN Client Pro on Android)
if (p->IPv4_State == PPP_PROTO_STATUS_CLOSED && p->ClientAddressOption.ServerAddress != NULL && ok)
if (p->IPv4_State == PPP_PROTO_STATUS_CLOSED && p->ClientAddressOption.ServerAddress != 0 && ok)
{
PPP_LCP* c = NewPPPLCP(PPP_LCP_CODE_REQ, 0);
UINT ui = p->ClientAddressOption.ServerAddress;
@ -1745,7 +1854,7 @@ bool PPPProcessIPCPRequestPacket(PPP_SESSION *p, PPP_PACKET* pp)
// Process EAP request packets
bool PPPProcessEAPRequestPacket(PPP_SESSION* p, PPP_PACKET* pp)
{
/// TODO: to implement
Debug("We got an EAP request, which is weird...\n");
return false;
}
@ -2882,12 +2991,273 @@ bool PPPGetIPAddressValueFromLCP(PPP_LCP *c, UINT type, IP *ip)
}
// EAP packet utilities
bool PPPProcessEAPTlsResponse(PPP_SESSION* p, PPP_EAP* eap_packet, UINT32 datasize)
bool PPPProcessEAPTlsResponse(PPP_SESSION* p, PPP_EAP* eap_packet, UINT eapTlsSize)
{
/// TODO: to implement
UCHAR* dataBuffer;
UINT dataSize;
UINT tlsLength = 0;
bool isFragmented = false;
PPP_LCP* lcp;
PPP_EAP* eap;
UCHAR flags;
UINT64 sizeLeft = 0;
if (eapTlsSize == 0)
{
// This is an EAP-TLS message ACK
if (p->Eap_TlsCtx.cachedBuffer != NULL && p->Eap_TlsCtx.cachedBufferSend == true)
{
// We got an ACK to transmit the next fragmented message
dataSize = p->Mru1 - 8 - 1 - 1; // Calculating the maximum payload size (without TlsLength)
sizeLeft = GetMemSize(p->Eap_TlsCtx.cachedBuffer);
sizeLeft -= p->Eap_TlsCtx.cachedBufferPntr - p->Eap_TlsCtx.cachedBuffer;
flags = 1 << 1; // M flag
if (dataSize > sizeLeft)
{
dataSize = sizeLeft;
flags = 0; // Clearing the M flag because it is the last packet
}
lcp = BuildEAPTlsRequest(p->Eap_PacketId++, dataSize, flags);
eap = lcp->Data;
Copy(eap->Tls.TlsDataWithoutLength, p->Eap_TlsCtx.cachedBufferPntr, dataSize);
p->Eap_TlsCtx.cachedBufferPntr += dataSize;
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcp))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
if (flags == 0)
{
// As it is the latest message, we need to cleanup
Free(p->Eap_TlsCtx.cachedBuffer);
p->Eap_TlsCtx.cachedBuffer = NULL;
p->Eap_TlsCtx.cachedBufferPntr = NULL;
p->Eap_TlsCtx.cachedBufferSend = false;
}
}
else
{
// It probably should be the final ACK on closed SSL pipe
SyncSslPipe(p->Eap_TlsCtx.SslPipe);
if (p->Eap_TlsCtx.clientCert.X != NULL)
{
IPC* ipc;
ETHERIP_ID d;
UINT error_code;
PPPParseUsername(p->Cedar, p->Eap_Identity, &d);
ipc = NewIPC(p->Cedar, p->ClientSoftwareName, p->Postfix, d.HubName, d.UserName, "",
&error_code, &p->ClientIP, p->ClientPort, &p->ServerIP, p->ServerPort,
p->ClientHostname, p->CryptName, false, p->AdjustMss, NULL, NULL,
IPC_LAYER_3);
if (ipc != NULL)
{
p->Ipc = ipc;
PPPSetStatus(p, PPP_STATUS_AUTH_SUCCESS);
// Just send an EAP-Success
lcp = NewPPPLCP(PPP_EAP_CODE_SUCCESS, p->Eap_PacketId++);
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcp))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
return true;
}
else
{
PPPSetStatus(p, PPP_STATUS_AUTH_FAIL);
lcp = NewPPPLCP(PPP_EAP_CODE_FAILURE, p->Eap_PacketId++);
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcp))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
return false;
}
}
else
{
Debug("Weird ACK for no reason at all...\n");
return false;
}
}
return true;
}
dataBuffer = eap_packet->Tls.TlsDataWithoutLength;
dataSize = eapTlsSize - 1;
if (eap_packet->Tls.Flags & 1)
{
dataBuffer = eap_packet->Tls.TlsDataWithLength.Data;
dataSize -= 4;
tlsLength = eap_packet->Tls.TlsDataWithLength.TlsLength;
}
if (eap_packet->Tls.Flags & 1 << 1)
{
isFragmented = true;
}
if (p->PPPStatus == PPP_STATUS_AUTHENTICATING)
{
// First we initialize the SslPipe if it is not already inited
if (p->Eap_TlsCtx.SslPipe == NULL)
{
p->Eap_TlsCtx.Dh = DhNewFromBits(DH_PARAM_BITS_DEFAULT);
p->Eap_TlsCtx.SslPipe = NewSslPipeEx(true, p->Cedar->ServerX, p->Cedar->ServerK, p->Eap_TlsCtx.Dh, true, &(p->Eap_TlsCtx.clientCert));
}
// If the current frame is fragmented, or it is a possible last of a fragmented series, bufferize it
if (isFragmented || p->Eap_TlsCtx.cachedBuffer != NULL)
{
if (p->Eap_TlsCtx.cachedBufferSend)
{
Debug("We got a weird packet when we have a sending only caching buffer, ignoring...\n");
return false;
}
if (p->Eap_TlsCtx.cachedBuffer == NULL && tlsLength > 0)
{
p->Eap_TlsCtx.cachedBuffer = ZeroMalloc(MAX(dataSize, tlsLength));
p->Eap_TlsCtx.cachedBufferPntr = p->Eap_TlsCtx.cachedBuffer;
}
else
{
Debug("We didn't get the tlsLength size! We're probably corrupt.\n");
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
sizeLeft = GetMemSize(p->Eap_TlsCtx.cachedBuffer);
sizeLeft -= p->Eap_TlsCtx.cachedBufferPntr - p->Eap_TlsCtx.cachedBuffer;
Copy(p->Eap_TlsCtx.cachedBufferPntr, dataBuffer, MIN(dataSize, sizeLeft));
p->Eap_TlsCtx.cachedBufferPntr += MIN(dataSize, sizeLeft);
}
// If we got a cached buffer, we should feed the FIFOs via it
if (p->Eap_TlsCtx.cachedBuffer != NULL)
{
dataBuffer = p->Eap_TlsCtx.cachedBuffer;
dataSize = GetMemSize(p->Eap_TlsCtx.cachedBuffer);
}
// Just acknoweldge that we buffered the fragmented data
if (isFragmented)
{
PPP_LCP* lcp = BuildEAPPacketEx(PPP_EAP_CODE_REQUEST, p->Eap_PacketId++, PPP_EAP_TYPE_TLS, 0);
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcp))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
}
else
{
WriteFifo(p->Eap_TlsCtx.SslPipe->RawIn->SendFifo, dataBuffer, dataSize);
SyncSslPipe(p->Eap_TlsCtx.SslPipe);
// Delete the cached buffer after we fed it into the pipe
if (p->Eap_TlsCtx.cachedBuffer != NULL)
{
Free(p->Eap_TlsCtx.cachedBuffer);
p->Eap_TlsCtx.cachedBuffer = NULL;
p->Eap_TlsCtx.cachedBufferPntr = NULL;
}
if (p->Eap_TlsCtx.SslPipe->IsDisconnected == false)
{
dataSize = FifoSize(p->Eap_TlsCtx.SslPipe->RawOut->RecvFifo);
// Do we need to send a fragmented packet?
if (dataSize > p->Mru1 - 8 - 1 - 1)
{
if (p->Eap_TlsCtx.cachedBuffer == NULL)
{
p->Eap_TlsCtx.cachedBuffer = ZeroMalloc(dataSize);
p->Eap_TlsCtx.cachedBufferPntr = p->Eap_TlsCtx.cachedBuffer;
}
p->Eap_TlsCtx.cachedBufferSend = true;
ReadFifo(p->Eap_TlsCtx.SslPipe->RawOut->RecvFifo, p->Eap_TlsCtx.cachedBuffer, dataSize);
// Now send data from the cached buffer with set fragmentation flag and also total TLS Size
tlsLength = dataSize;
dataSize = p->Mru1 - 8 - 1 - 1 - 4; // Calculating the maximum payload size (adjusting for including TlsLength)
flags = 1; // L flag
flags |= 1 << 1; // M flag
lcp = BuildEAPTlsRequest(p->Eap_PacketId++, dataSize, flags);
eap = lcp->Data;
eap->Tls.TlsDataWithLength.TlsLength = tlsLength;
Copy(eap->Tls.TlsDataWithLength.Data, p->Eap_TlsCtx.cachedBuffer, dataSize);
p->Eap_TlsCtx.cachedBufferPntr = p->Eap_TlsCtx.cachedBuffer + dataSize;
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcp))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
}
else
{
lcp = BuildEAPTlsRequest(p->Eap_PacketId++, dataSize, 0);
eap = lcp->Data;
ReadFifo(p->Eap_TlsCtx.SslPipe->RawOut->RecvFifo, &(eap->Tls.TlsDataWithoutLength), dataSize);
if (!PPPSendAndRetransmitRequest(p, PPP_PROTOCOL_EAP, lcp))
{
PPPSetStatus(p, PPP_STATUS_FAIL);
WHERE;
return false;
}
}
}
}
}
else
{
Debug("Got an EAP_TLS packet when not authenticating, ignoring...\n");
}
return false;
}
PPP_LCP *BuildEAPPacketEx(UCHAR code, UCHAR id, UCHAR type, UINT datasize)
{
PPP_EAP* eap_packet;
PPP_LCP* lcp_packet;
UINT lcpDatasize;
lcpDatasize = datasize + sizeof(UCHAR);
eap_packet = ZeroMalloc(lcpDatasize);
eap_packet->Type = type;
lcp_packet = NewPPPLCP(code, id);
lcp_packet->Data = eap_packet;
lcp_packet->DataSize = lcpDatasize;
return lcp_packet;
}
PPP_LCP *BuildEAPTlsPacketEx(UCHAR code, UCHAR id, UCHAR type, UINT datasize, UCHAR flags)
{
PPP_LCP* lcp_packet;
PPP_EAP* eap_packet;
UINT tls_datasize = datasize + sizeof(UCHAR);
if (flags & 1)
{
tls_datasize += sizeof(UINT32);
}
lcp_packet = BuildEAPPacketEx(code, id, type, tls_datasize);
eap_packet = lcp_packet->Data;
eap_packet->Tls.Flags = flags;
return lcp_packet;
}
PPP_LCP* BuildEAPTlsRequest(UCHAR id, UINT datasize, UCHAR flags)
{
return BuildEAPTlsPacketEx(PPP_EAP_CODE_REQUEST, id, PPP_EAP_TYPE_TLS, datasize, flags);
}
// Other packet utilities
// Get the option value
@ -2999,6 +3369,25 @@ void FreePPPSession(PPP_SESSION *p)
p->TubeRecv->IntParam2 = p->DisconnectCauseDirection;
}
// Freeing EAP-TLS context
if (p->Eap_TlsCtx.cachedBuffer != NULL)
{
Free(p->Eap_TlsCtx.cachedBuffer);
}
if (p->Eap_TlsCtx.SslPipe != NULL)
{
FreeSslPipe(p->Eap_TlsCtx.SslPipe);
}
if (p->Eap_TlsCtx.clientCert.X != NULL)
{
FreeX(p->Eap_TlsCtx.clientCert.X);
}
if (p->Eap_TlsCtx.Dh != NULL)
{
DhFree(p->Eap_TlsCtx.Dh);
}
FreeTubeFlushList(p->FlushList);
TubeDisconnect(p->TubeRecv);

35
src/Cedar/Proto_PPP.h
View File

@ -21,8 +21,8 @@
#define PPP_CHAP_CODE_IS_REQUEST(c) ((c) == PPP_CHAP_CODE_CHALLENGE || (c) == PPP_CHAP_CODE_SUCCESS || (c) == PPP_CHAP_CODE_FAILURE)
#define PPP_CHAP_CODE_IS_RESPONSE(c) ((c) == PPP_CHAP_CODE_RESPONSE)
#define PPP_EAP_CODE_IS_REQUEST(c) ((c) == PPP_EAP_CODE_REQUEST || (c) == PPP_EAP_CODE_SUCCESS || (c) == PPP_EAP_CODE_FAILURE) // We treat SUCCESS and FAILURE as requests because they affect global state of the EAP protocol
#define PPP_EAP_CODE_IS_RESPONSE(c) ((c) == PPP_EAP_CODE_RESPONSE)
#define PPP_EAP_CODE_IS_REQUEST(c) ((c) == PPP_EAP_CODE_REQUEST)
#define PPP_EAP_CODE_IS_RESPONSE(c) ((c) == PPP_EAP_CODE_RESPONSE || (c) == PPP_EAP_CODE_SUCCESS || (c) == PPP_EAP_CODE_FAILURE)
#define PPP_CODE_IS_RESPONSE(protocol, c) ((((protocol) == PPP_PROTOCOL_LCP || (protocol) == PPP_PROTOCOL_IPCP || (protocol) == PPP_PROTOCOL_IPV6CP) && PPP_LCP_CODE_IS_RESPONSE(c)) || (((protocol) == PPP_PROTOCOL_PAP) && PPP_PAP_CODE_IS_RESPONSE(c)) || (((protocol) == PPP_PROTOCOL_CHAP) && PPP_CHAP_CODE_IS_RESPONSE(c)) || (((protocol) == PPP_PROTOCOL_EAP) && PPP_EAP_CODE_IS_RESPONSE(c)))
#define PPP_CODE_IS_REQUEST(protocol, c) ((((protocol) == PPP_PROTOCOL_LCP || (protocol) == PPP_PROTOCOL_IPCP || (protocol) == PPP_PROTOCOL_IPV6CP) && PPP_LCP_CODE_IS_REQUEST(c)) || (((protocol) == PPP_PROTOCOL_PAP) && PPP_PAP_CODE_IS_REQUEST(c)) || (((protocol) == PPP_PROTOCOL_CHAP) && PPP_CHAP_CODE_IS_REQUEST(c)) || (((protocol) == PPP_PROTOCOL_EAP) && PPP_EAP_CODE_IS_REQUEST(c)))
@ -112,6 +112,7 @@
// Authentication protocol
#define PPP_LCP_AUTH_PAP PPP_PROTOCOL_PAP
#define PPP_LCP_AUTH_CHAP PPP_PROTOCOL_CHAP
#define PPP_LCP_AUTH_EAP PPP_PROTOCOL_EAP
// Algorithm of CHAP
#define PPP_CHAP_ALG_MS_CHAP_V2 0x81
@ -182,26 +183,37 @@ struct PPP_OPTION
// PPP EAP packet
// EAP is a subset of LCP, sharing Code and Id. The Data field is then mapped to this structure
// We got 8 bytes of size before this structure
struct PPP_EAP
{
UCHAR Type;
union {
UCHAR Data[253]; // LCP Data field = 254 minus 1 byte for Type field
UCHAR Data[0];
struct PPP_EAP_TLS
{
UCHAR Flags;
union {
UCHAR TlsDataWithoutLength[252]; // EAP-TLS structure size 1 (Flags) + 252 = 253
UCHAR TlsDataWithoutLength[0];
struct
{
UINT32 Length;
UCHAR Data[248]; // EAP-TLS structure size 1 (Flags) + 4 (TlsSize) + 248 = 253
UINT32 TlsLength;
UCHAR Data[0];
} TlsDataWithLength;
};
} Tls;
};
};
struct PPP_EAP_TLS_CONTEXT
{
SSL_PIPE* SslPipe;
DH_CTX* Dh;
struct SslClientCertInfo clientCert;
UCHAR* cachedBuffer;
UCHAR* cachedBufferPntr;
bool cachedBufferSend;
};
// PPP request resend
struct PPP_REQUEST_RESEND
{
@ -272,6 +284,12 @@ struct PPP_SESSION
UINT IPv4_State;
UINT IPv6_State;
// EAP contexts
UINT Eap_Protocol; // Current EAP Protocol used
UINT Eap_PacketId; // EAP Packet ID;
UCHAR Eap_Identity[MAX_SIZE]; // Received from client identity
PPP_EAP_TLS_CONTEXT Eap_TlsCtx; // Context information for EAP TLS. May be possibly reused for EAP TTLS?
LIST *SentReqPacketList; // Sent requests list
PPP_PACKET *CurrentPacket;
@ -352,7 +370,10 @@ bool PPPSetIPOptionToLCP(PPP_IPOPTION *o, PPP_LCP *c, bool only_modify);
bool PPPGetIPAddressValueFromLCP(PPP_LCP *c, UINT type, IP *ip);
bool PPPSetIPAddressValueToLCP(PPP_LCP *c, UINT type, IP *ip, bool only_modify);
// EAP packet utilities
bool PPPProcessEAPTlsResponse(PPP_SESSION* p, PPP_EAP* eap_packet, UINT32 datasize);
bool PPPProcessEAPTlsResponse(PPP_SESSION* p, PPP_EAP* eap_packet, UINT eapTlsSize);
PPP_LCP *BuildEAPPacketEx(UCHAR code, UCHAR id, UCHAR type, UINT datasize);
PPP_LCP *BuildEAPTlsPacketEx(UCHAR code, UCHAR id, UCHAR type, UINT datasize, UCHAR flags);
PPP_LCP* BuildEAPTlsRequest(UCHAR id, UINT datasize, UCHAR flags);
// Other packet utilities
PPP_OPTION *PPPGetOptionValue(PPP_LCP *c, UCHAR type);
bool IsHubExistsWithLock(CEDAR *cedar, char *hubname);