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Writing skeleton for EAP-TLS implementation

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This commit is contained in:
Evengard 2020-05-02 01:54:03 +03:00
parent aa0ec4343c
commit a65c436e8f
3 changed files with 94 additions and 5 deletions
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1
src/Cedar/CedarType.h
View File

@ -500,6 +500,7 @@ typedef struct PPP_IPOPTION PPP_IPOPTION;
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;
// ==============================================================

49
src/Cedar/Proto_PPP.c
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@ -706,6 +706,9 @@ bool PPPProcessResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req)
case PPP_PROTOCOL_IPV6CP:
Debug("IPv6CP to be implemented\n");
break;
case PPP_PROTOCOL_EAP:
return PPPProcessEAPResponsePacket(p, pp, req);
break;
default:
Debug("We received a response for an unsupported protocol??? Should be filtered out already! protocol = 0x%x, code = 0x%x\n", pp->Protocol, pp->Lcp->Code);
PPPSetStatus(p, PPP_STATUS_FAIL);
@ -1061,6 +1064,31 @@ bool PPPProcessIPCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *re
return false;
}
// 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)
{
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;
}
return false;
}
// Processes request packets
bool PPPProcessRequestPacket(PPP_SESSION *p, PPP_PACKET *pp)
@ -1086,6 +1114,9 @@ bool PPPProcessRequestPacket(PPP_SESSION *p, PPP_PACKET *pp)
PPPRejectUnsupportedPacketEx(p, pp, true);
Debug("IPv6CP to be implemented\n");
break;
case PPP_PROTOCOL_EAP:
return PPPProcessEAPRequestPacket(p, pp);
break;
default:
Debug("Unsupported protocols should be already filtered out! protocol = 0x%x, code = 0x%x\n", pp->Protocol, pp->Lcp->Code);
return false;
@ -1711,6 +1742,13 @@ bool PPPProcessIPCPRequestPacket(PPP_SESSION *p, PPP_PACKET* pp)
return ok;
}
// Process EAP request packets
bool PPPProcessEAPRequestPacket(PPP_SESSION* p, PPP_PACKET* pp)
{
/// TODO: to implement
return false;
}
// LCP option based packets utility
bool PPPRejectLCPOptions(PPP_SESSION *p, PPP_PACKET* pp)
{
@ -2270,7 +2308,7 @@ PPP_PACKET *ParsePPPPacket(void *data, UINT size)
size -= 2;
buf += 2;
if (pp->Protocol == PPP_PROTOCOL_LCP || pp->Protocol == PPP_PROTOCOL_PAP || pp->Protocol == PPP_PROTOCOL_CHAP || pp->Protocol == PPP_PROTOCOL_IPCP || pp->Protocol == PPP_PROTOCOL_IPV6CP)
if (pp->Protocol == PPP_PROTOCOL_LCP || pp->Protocol == PPP_PROTOCOL_PAP || pp->Protocol == PPP_PROTOCOL_CHAP || pp->Protocol == PPP_PROTOCOL_IPCP || pp->Protocol == PPP_PROTOCOL_IPV6CP || pp->Protocol == PPP_PROTOCOL_EAP)
{
pp->IsControl = true;
}
@ -2843,6 +2881,13 @@ bool PPPGetIPAddressValueFromLCP(PPP_LCP *c, UINT type, IP *ip)
return true;
}
// EAP packet utilities
bool PPPProcessEAPTlsResponse(PPP_SESSION* p, PPP_EAP* eap_packet, UINT32 datasize)
{
/// TODO: to implement
return false;
}
// Other packet utilities
// Get the option value
@ -3367,3 +3412,5 @@ char *MsChapV2DoBruteForce(IPC_MSCHAP_V2_AUTHINFO *d, LIST *password_list)
return NULL;
}

49
src/Cedar/Proto_PPP.h
View File

@ -21,11 +21,14 @@
#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_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)))
#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)))
#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_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)))
#define PPP_CODE_IS_WITH_OPTION_LIST(protocol, c) ((((protocol) == PPP_PROTOCOL_LCP || (protocol) == PPP_PROTOCOL_IPCP || (protocol) == PPP_PROTOCOL_IPV6CP) && PPP_LCP_CODE_IS_WITH_OPTION_LIST(c)) || false)
#define PPP_IS_SUPPORTED_PROTOCOL(p) ((p) == PPP_PROTOCOL_LCP || (p) == PPP_PROTOCOL_PAP || (p) == PPP_PROTOCOL_CHAP || (p) == PPP_PROTOCOL_IPCP || (p) == PPP_PROTOCOL_IPV6CP || (p) == PPP_PROTOCOL_IP || (p) == PPP_PROTOCOL_IPV6)
#define PPP_IS_SUPPORTED_PROTOCOL(p) ((p) == PPP_PROTOCOL_LCP || (p) == PPP_PROTOCOL_PAP || (p) == PPP_PROTOCOL_CHAP || (p) == PPP_PROTOCOL_IPCP || (p) == PPP_PROTOCOL_IPV6CP || (p) == PPP_PROTOCOL_IP || (p) == PPP_PROTOCOL_IPV6 || (p) == PPP_PROTOCOL_EAP )
#define PPP_STATUS_IS_UNAVAILABLE(c) ((c) == PPP_STATUS_FAIL || (c) == PPP_STATUS_AUTH_FAIL || (c) == PPP_STATUS_CLOSING || (c) == PPP_STATUS_CLOSING_WAIT || (c) == PPP_STATUS_CLOSED)
@ -48,6 +51,7 @@
#define PPP_PROTOCOL_PAP 0xc023
#define PPP_PROTOCOL_IPCP 0x8021
#define PPP_PROTOCOL_CHAP 0xc223
#define PPP_PROTOCOL_EAP 0xc227
#define PPP_PROTOCOL_IPV6CP 0x8057
// PPP protocol (for transfer)
@ -93,6 +97,18 @@
// IPV6CP option type
#define PPP_IPV6CP_OPTION_IID 1
// EAP codes
#define PPP_EAP_CODE_REQUEST 1
#define PPP_EAP_CODE_RESPONSE 2
#define PPP_EAP_CODE_SUCCESS 3
#define PPP_EAP_CODE_FAILURE 4
// EAP types
#define PPP_EAP_TYPE_IDENTITY 1
#define PPP_EAP_TYPE_NOTIFICATION 2
#define PPP_EAP_TYPE_NAK 3
#define PPP_EAP_TYPE_TLS 13
// Authentication protocol
#define PPP_LCP_AUTH_PAP PPP_PROTOCOL_PAP
#define PPP_LCP_AUTH_CHAP PPP_PROTOCOL_CHAP
@ -164,6 +180,28 @@ struct PPP_OPTION
UINT AltDataSize; // Alternate data size
};
// PPP EAP packet
// EAP is a subset of LCP, sharing Code and Id. The Data field is then mapped to this structure
struct PPP_EAP
{
UCHAR Type;
union {
UCHAR Data[253]; // LCP Data field = 254 minus 1 byte for Type field
struct PPP_EAP_TLS
{
UCHAR Flags;
union {
UCHAR TlsDataWithoutLength[252]; // EAP-TLS structure size 1 (Flags) + 252 = 253
struct
{
UINT32 Length;
UCHAR Data[248]; // EAP-TLS structure size 1 (Flags) + 4 (TlsSize) + 248 = 253
} TlsDataWithLength;
};
} Tls;
};
};
// PPP request resend
struct PPP_REQUEST_RESEND
{
@ -267,11 +305,13 @@ bool PPPProcessResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req);
bool PPPProcessLCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req);
bool PPPProcessCHAPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req);
bool PPPProcessIPCPResponsePacket(PPP_SESSION *p, PPP_PACKET *pp, PPP_PACKET *req);
bool PPPProcessEAPResponsePacket(PPP_SESSION* p, PPP_PACKET* pp, PPP_PACKET* req);
// Request packets
bool PPPProcessRequestPacket(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPProcessLCPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPProcessPAPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPProcessIPCPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPProcessEAPRequestPacket(PPP_SESSION* p, PPP_PACKET* pp);
// LCP option based packets utility
bool PPPRejectLCPOptions(PPP_SESSION *p, PPP_PACKET *pp);
@ -281,7 +321,6 @@ bool PPPNackLCPOptionsEx(PPP_SESSION *p, PPP_PACKET* pp, bool simulate);
bool PPPAckLCPOptions(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPAckLCPOptionsEx(PPP_SESSION *p, PPP_PACKET *pp, bool simulate);
// PPP networking functions
// Send packets
bool PPPSendAndRetransmitRequest(PPP_SESSION *p, USHORT protocol, PPP_LCP *c);
@ -312,6 +351,8 @@ bool PPPGetIPOptionFromLCP(PPP_IPOPTION *o, PPP_LCP *c);
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);
// Other packet utilities
PPP_OPTION *PPPGetOptionValue(PPP_LCP *c, UCHAR type);
bool IsHubExistsWithLock(CEDAR *cedar, char *hubname);