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SoftEtherVPN/src/Cedar/Proto_PPP.h

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// SoftEther VPN Source Code - Developer Edition Master Branch
// Cedar Communication Module
// Proto_PPP.h
// Header of Proto_PPP.c
#ifndef PROTO_PPP_H
#define PROTO_PPP_H
//// Macro
#define PPP_LCP_CODE_IS_NEGATIVE(c) ((c) == PPP_LCP_CODE_NAK || (c) == PPP_LCP_CODE_REJECT || (c) == PPP_LCP_CODE_CODE_REJECT || (c) == PPP_LCP_CODE_PROTOCOL_REJECT)
#define PPP_LCP_CODE_IS_REQUEST(c) ((c) == PPP_LCP_CODE_REQ)
#define PPP_LCP_CODE_IS_RESPONSE(c) ((c) == PPP_LCP_CODE_ACK || (c) == PPP_LCP_CODE_NAK || (c) == PPP_LCP_CODE_REJECT || (c) == PPP_LCP_CODE_PROTOCOL_REJECT)
#define PPP_LCP_CODE_IS_WITH_OPTION_LIST(c) ((c) == PPP_LCP_CODE_REQ || (c) == PPP_LCP_CODE_ACK || (c) == PPP_LCP_CODE_NAK || (c) == PPP_LCP_CODE_REJECT)
#define PPP_PAP_CODE_IS_REQUEST(c) ((c) == PPP_PAP_CODE_REQ)
#define PPP_PAP_CODE_IS_RESPONSE(c) ((c) == PPP_PAP_CODE_ACK || (c) == PPP_PAP_CODE_NAK)
#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)
#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)))
#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 || (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)
//// Constants
// Time-out value
#define PPP_PACKET_RECV_TIMEOUT (15 * 1000) // Timeout until the next packet is received (3/4 of default policy)
#define PPP_PACKET_RESEND_INTERVAL (3 * 1000) // Retransmission interval of the last packet
#define PPP_TERMINATE_TIMEOUT 2000 // Timeout value to complete disconnection after requesting to disconnect in the PPP
#define PPP_ECHO_SEND_INTERVAL 4792 // Transmission interval of PPP Echo Request
#define PPP_DATA_TIMEOUT (20 * 1000) // Communication time-out (from default policy)
// MRU
#define PPP_MRU_DEFAULT 1500 // Default value
#define PPP_MRU_MIN 100 // Minimum value
#define PPP_MRU_MAX 1500 // Maximum value
// PPP protocol (for control)
#define PPP_PROTOCOL_LCP 0xc021
#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)
#define PPP_PROTOCOL_IP 0x0021
#define PPP_PROTOCOL_IPV6 0x0057
// LCP code
#define PPP_LCP_CODE_REQ 1
#define PPP_LCP_CODE_ACK 2
#define PPP_LCP_CODE_NAK 3
#define PPP_LCP_CODE_REJECT 4
#define PPP_LCP_CODE_TERMINATE_REQ 5
#define PPP_LCP_CODE_TERMINATE_ACK 6
#define PPP_LCP_CODE_CODE_REJECT 7
#define PPP_LCP_CODE_PROTOCOL_REJECT 8
#define PPP_LCP_CODE_ECHO_REQUEST 9
#define PPP_LCP_CODE_ECHO_RESPONSE 10
#define PPP_LCP_CODE_DROP 11
#define PPP_LCP_CODE_IDENTIFICATION 12
// PAP Code
#define PPP_PAP_CODE_REQ 1
#define PPP_PAP_CODE_ACK 2
#define PPP_PAP_CODE_NAK 3
// CHAP code
#define PPP_CHAP_CODE_CHALLENGE 1
#define PPP_CHAP_CODE_RESPONSE 2
#define PPP_CHAP_CODE_SUCCESS 3
#define PPP_CHAP_CODE_FAILURE 4
// LCP Option Type
#define PPP_LCP_OPTION_MRU 1
#define PPP_LCP_OPTION_AUTH 3
// IPCP option type
#define PPP_IPCP_OPTION_IP 3
#define PPP_IPCP_OPTION_DNS1 129
#define PPP_IPCP_OPTION_DNS2 131
#define PPP_IPCP_OPTION_WINS1 130
#define PPP_IPCP_OPTION_WINS2 132
// IPV6CP option type
#define PPP_IPV6CP_OPTION_EUI 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
// EAP-TLS Flags
#define PPP_EAP_TLS_FLAG_NONE 0
#define PPP_EAP_TLS_FLAG_TLS_LENGTH 1 << 7
#define PPP_EAP_TLS_FLAG_FRAGMENTED 1 << 6
#define PPP_EAP_TLS_FLAG_SSLSTARTED 1 << 5
// 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
// Link status
#define PPP_STATUS_CONNECTED 0x1
#define PPP_STATUS_BEFORE_AUTH 0x10
#define PPP_STATUS_AUTHENTICATING 0x11
#define PPP_STATUS_AUTH_SUCCESS 0x19
#define PPP_STATUS_NETWORK_LAYER 0x20
#define PPP_STATUS_CLOSING 0x100
#define PPP_STATUS_CLOSING_WAIT 0x101
#define PPP_STATUS_CLOSED 0x110
#define PPP_STATUS_FAIL 0x1000
#define PPP_STATUS_AUTH_FAIL 0x1010
#define PPP_UNSPECIFIED 0xFFFF
//// Type
// IP options used in the PPP
struct PPP_IPOPTION
{
IP IpAddress; // IP address
IP DnsServer1, DnsServer2; // DNS server address
IP WinsServer1, WinsServer2; // WINS server address
};
// PPP packet
struct PPP_PACKET
{
USHORT Protocol; // Protocol
bool IsControl; // Whether or not the control packet
PPP_LCP *Lcp; // LCP packet data
UINT DataSize; // Data size
void *Data; // Data body
};
// PPP LCP packet
struct PPP_LCP
{
UCHAR Code; // Code
UCHAR Id; // ID
UCHAR MagicNumber[4]; // Magic number
LIST *OptionList; // PPP options list
void *Data; // Data
UINT DataSize; // Data size
};
// PPP Options
struct PPP_OPTION
{
UCHAR Type; // Type of option
UINT DataSize; // Data size
UCHAR Data[254]; // Data
bool IsSupported; // Flag of whether it is supported
bool IsAccepted; // Flag for whether accepted
UCHAR AltData[254]; // Alternate data when it isn't accepted
UINT AltDataSize; // Alternate data size
};
#ifdef OS_WIN32
#pragma pack(push, 1)
#else // OS_WIN32
#pragma pack(1)
#endif
// 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[0];
struct PPP_EAP_TLS
{
UCHAR Flags;
union {
UCHAR TlsDataWithoutLength[0];
struct
{
UINT32 TlsLength;
UCHAR Data[0];
} TlsDataWithLength;
};
} Tls;
};
} GCC_PACKED;
#ifdef OS_WIN32
#pragma pack(pop)
#else // OS_WIN32
#pragma pack()
#endif
struct PPP_EAP_TLS_CONTEXT
{
SSL_PIPE *SslPipe;
DH_CTX *Dh;
struct SslClientCertInfo ClientCert;
UCHAR *CachedBufferRecv;
UCHAR *CachedBufferRecvPntr;
UCHAR *CachedBufferSend;
UCHAR *CachedBufferSendPntr;
};
// PPP request resend
struct PPP_REQUEST_RESEND
{
PPP_PACKET *Packet;
UCHAR Id;
UINT64 ResendTime;
UINT64 TimeoutTime;
};
// PPP next packet struct
struct PPP_DELAYED_PACKET
{
PPP_PACKET *Packet;
UINT DelayTicks;
};
// PPP session
struct PPP_SESSION
{
CEDAR *Cedar; // Cedar
IP ClientIP; // Client IP address
UINT ClientPort; // Client port
IP ServerIP; // Server IP address
UINT ServerPort; // Server port
TUBE *TubeSend; // Sending tube
TUBE *TubeRecv; // Receiving tube
UCHAR NextId; // ID to be used next
UINT Mru1; // MRU (server -> client)
UINT Mru2; // MRU (client -> server)
LIST *RecvPacketList; // Received packet list
bool IsTerminateReceived; // Whether a Terminate has been received
UINT DisconnectCauseCode; // L2TP disconnect cause code
UINT DisconnectCauseDirection; // L2TP disconnect cause direction code
IPC *Ipc; // IPC
bool ClientLCPOptionDetermined; // LCP option from the client has been determined
char Postfix[MAX_SIZE]; // Postfix of the session name
char ClientHostname[MAX_SIZE]; // Client host name
char ClientSoftwareName[MAX_SIZE]; // Client software name
UINT64 NextEchoSendTime; // Time to send Echo Request next
UINT64 LastRecvTime; // Time which the data has been received last
DHCP_OPTION_LIST ClientAddressOption; // Client address option
bool DhcpIpAllocTried; // Whether the request for an IP address is already attempted by DHCP
bool DhcpIpInformTried; // Whether the acquirement for an IP information is already attempted by DHCP
bool DhcpAllocated; // IP address is assigned by DHCP
bool UseStaticIPAddress; // Use a static IP address that is specified by the client
UINT64 DhcpRenewInterval; // DHCP update interval
UINT64 DhcpNextRenewTime; // DHCP renewal time of the next
char CryptName[MAX_SIZE]; // Cipher algorithm name
UINT AdjustMss; // MSS value
TUBE_FLUSH_LIST *FlushList; // Tube Flush List
bool EnableMSCHAPv2; // Enable the MS-CHAP v2
USHORT AuthProtocol; // Authentication protocol
bool AuthOk; // Flag for whether the authentication was successful
UCHAR MsChapV2_ServerChallenge[16]; // MS-CHAPv2 Server Challenge
UCHAR MsChapV2_ClientChallenge[16]; // MS-CHAPv2 Client Challenge
UCHAR MsChapV2_ClientResponse[24]; // MS-CHAPv2 Client Response
UCHAR MsChapV2_ServerResponse[20]; // MS-CHAPv2 Server Response
UINT MsChapV2_ErrorCode; // Authentication failure error code of MS-CHAPv2
UINT MsChapV2_PacketId; // MS-CHAPv2 Packet ID
bool MsChapV2_UseDoubleMsChapV2; // Use the double-MSCHAPv2 technique
EAP_CLIENT *EapClient; // EAP client
UCHAR ServerInterfaceId[8]; // Server IPv6CP Interface Identifier
UCHAR ClientInterfaceId[8]; // Client IPv6CP Interface Identifier
UINT PPPStatus;
// 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;
LIST *DelayedPackets;
UINT64 PacketRecvTimeout;
UINT64 DataTimeout;
UINT64 UserConnectionTimeout;
UINT64 UserConnectionTick;
THREAD *SessionThread; // Thread of the PPP session
};
// Function prototype
// Main dataloop
void PPPThread(THREAD *thread, void *param);
// Entry point
PPP_SESSION *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *server_ip, UINT server_port, TUBE *send_tube, TUBE *recv_tube, char *postfix, char *client_software_name, char *client_hostname, char *crypt_name, UINT adjust_mss);
// PPP processing functions
bool PPPRejectUnsupportedPacket(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPRejectUnsupportedPacketEx(PPP_SESSION *p, PPP_PACKET *pp, bool force);
bool PPPProcessRetransmissions(PPP_SESSION *p);
bool PPPSendEchoRequest(PPP_SESSION *p);
// Response packets
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);
bool PPPProcessIPv6CPResponsePacket(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);
bool PPPProcessIPv6CPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp);
// LCP option based packets utility
bool PPPRejectLCPOptions(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPRejectLCPOptionsEx(PPP_SESSION *p, PPP_PACKET *pp, bool simulate);
bool PPPNackLCPOptions(PPP_SESSION *p, PPP_PACKET *pp);
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);
bool PPPSendPacketAndFree(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPSendPacketEx(PPP_SESSION *p, PPP_PACKET *pp, bool no_flush);
// Receive packets
PPP_PACKET *PPPRecvPacket(PPP_SESSION *p, bool async);
// Helpers for delaying packets
PPP_PACKET *PPPGetNextPacket(PPP_SESSION *p);
void PPPAddNextPacket(PPP_SESSION *p, PPP_PACKET *pp, UINT delay);
int PPPDelayedPacketsComparator(void *a, void *b);
char PPPRelatedPacketComparator(PPP_PACKET *a, PPP_PACKET *b);
// PPP utility functions
// Packet structures creation utilities
PPP_LCP *NewPPPLCP(UCHAR code, UCHAR id);
PPP_OPTION *NewPPPOption(UCHAR type, void *data, UINT size);
// Packet parse utilities
PPP_PACKET *ParsePPPPacket(void *data, UINT size);
PPP_LCP *PPPParseLCP(USHORT protocol, void *data, UINT size);
bool PPPParseMSCHAP2ResponsePacket(PPP_SESSION *p, PPP_PACKET *req);
// Packet building utilities
BUF *BuildPPPPacketData(PPP_PACKET *pp);
BUF *BuildLCPData(PPP_LCP *c);
PPP_LCP *BuildMSCHAP2ChallengePacket(PPP_SESSION *p);
// IPCP packet utilities
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, 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);
void PPPSetStatus(PPP_SESSION *p, UINT status);
// Memory freeing functions
void FreePPPSession(PPP_SESSION *p);
void FreePPPLCP(PPP_LCP *c);
void FreePPPOptionList(LIST *o);
void FreePPPPacket(PPP_PACKET *pp);
void FreePPPPacketEx(PPP_PACKET *pp, bool no_free_struct);
void PPPFreeEapClient(PPP_SESSION *p);
// Utility functions used not only in PPP stack
bool PPPParseUsername(CEDAR *cedar, char *src, ETHERIP_ID *dst);
void GenerateNtPasswordHash(UCHAR *dst, char *password);
void GenerateNtPasswordHashHash(UCHAR *dst_hash, UCHAR *src_hash);
void MsChapV2Server_GenerateChallenge(UCHAR *dst);
void MsChapV2_GenerateChallenge8(UCHAR *dst, UCHAR *client_challenge, UCHAR *server_challenge, char *username);
void MsChapV2Client_GenerateResponse(UCHAR *dst, UCHAR *challenge8, UCHAR *nt_password_hash);
void MsChapV2Server_GenerateResponse(UCHAR *dst, UCHAR *nt_password_hash_hash, UCHAR *client_response, UCHAR *challenge8);
bool MsChapV2VerityPassword(IPC_MSCHAP_V2_AUTHINFO *d, char *password);
char *MsChapV2DoBruteForce(IPC_MSCHAP_V2_AUTHINFO *d, LIST *password_list);
#endif // PROTO_PPP_H
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