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https://github.com/SoftEtherVPN/SoftEtherVPN.git
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156 lines
5.9 KiB
C
156 lines
5.9 KiB
C
// SoftEther VPN Source Code - Developer Edition Master Branch
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// Cedar Communication Module
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// Proto_SSTP.h
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// Header of Proto_SSTP.c
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#ifndef PROTO_SSTP_H
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#define PROTO_SSTP_H
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//// Constants
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#define SSTP_URI "/sra_{BA195980-CD49-458b-9E23-C84EE0ADCD75}/" // SSTP HTTPS URI
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#define SSTP_VERSION_1 0x10 // SSTP Version 1.0
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#define MAX_SSTP_PACKET_SIZE 4096 // Maximum packet size
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#define SSTP_IPC_CLIENT_NAME "Microsoft SSTP VPN Client"
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#define SSTP_IPC_POSTFIX "SSTP"
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#define SSTP_ECHO_SEND_INTERVAL_MIN 2500 // Transmission interval of Echo Request (minimum)
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#define SSTP_ECHO_SEND_INTERVAL_MAX 4792 // Transmission interval of Echo Request (maximum)
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#define SSTP_TIMEOUT 10000 // Communication time-out of SSTP
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// SSTP Message Type
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#define SSTP_MSG_CALL_CONNECT_REQUEST 0x0001
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#define SSTP_MSG_CALL_CONNECT_ACK 0x0002
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#define SSTP_MSG_CALL_CONNECT_NAK 0x0003
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#define SSTP_MSG_CALL_CONNECTED 0x0004
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#define SSTP_MSG_CALL_ABORT 0x0005
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#define SSTP_MSG_CALL_DISCONNECT 0x0006
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#define SSTP_MSG_CALL_DISCONNECT_ACK 0x0007
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#define SSTP_MSG_ECHO_REQUEST 0x0008
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#define SSTP_MSG_ECHO_RESPONSE 0x0009
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// SSTP Attribute ID
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#define SSTP_ATTRIB_NO_ERROR 0x00
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#define SSTP_ATTRIB_ENCAPSULATED_PROTOCOL_ID 0x01
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#define SSTP_ATTRIB_STATUS_INFO 0x02
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#define SSTP_ATTRIB_CRYPTO_BINDING 0x03
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#define SSTP_ATTRIB_CRYPTO_BINDING_REQ 0x04
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// Protocol ID
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#define SSTP_ENCAPSULATED_PROTOCOL_PPP 0x0001
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// Hash Protocol Bitmask
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#define CERT_HASH_PROTOCOL_SHA1 0x01
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#define CERT_HASH_PROTOCOL_SHA256 0x02
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// Status
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#define ATTRIB_STATUS_NO_ERROR 0x00000000
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#define ATTRIB_STATUS_DUPLICATE_ATTRIBUTE 0x00000001
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#define ATTRIB_STATUS_UNRECOGNIZED_ATTRIBUTE 0x00000002
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#define ATTRIB_STATUS_INVALID_ATTRIB_VALUE_LENGTH 0x00000003
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#define ATTRIB_STATUS_VALUE_NOT_SUPPORTED 0x00000004
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#define ATTRIB_STATUS_UNACCEPTED_FRAME_RECEIVED 0x00000005
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#define ATTRIB_STATUS_RETRY_COUNT_EXCEEDED 0x00000006
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#define ATTRIB_STATUS_INVALID_FRAME_RECEIVED 0x00000007
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#define ATTRIB_STATUS_NEGOTIATION_TIMEOUT 0x00000008
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#define ATTRIB_STATUS_ATTRIB_NOT_SUPPORTED_IN_MSG 0x00000009
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#define ATTRIB_STATUS_REQUIRED_ATTRIBUTE_MISSING 0x0000000A
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#define ATTRIB_STATUS_STATUS_INFO_NOT_SUPPORTED_IN_MSG 0x0000000B
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// State of SSTP Server
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#define SSTP_SERVER_STATUS_REQUEST_PENGING 0 // Connection incomplete
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#define SSTP_SERVER_STATUS_CONNECTED_PENDING 1 // Connection completed. Authentication incomplete
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#define SSTP_SERVER_STATUS_ESTABLISHED 2 // Connection completed. Communication available
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// Length of Nonce
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#define SSTP_NONCE_SIZE 32 // 256 bits
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//// Type
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// SSTP Attribute
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struct SSTP_ATTRIBUTE
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{
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UCHAR AttributeId;
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UCHAR *Data;
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UINT DataSize;
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UINT TotalLength;
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};
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// SSTP Packet
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struct SSTP_PACKET
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{
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UCHAR Version;
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bool IsControl;
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UCHAR *Data;
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UINT DataSize;
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USHORT MessageType;
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LIST *AttributeList;
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};
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// SSTP Server
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struct SSTP_SERVER
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{
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CEDAR *Cedar;
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UINT64 Now;
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IP ClientIp, ServerIp;
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UINT ClientPort, ServerPort;
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char ClientHostName[MAX_HOST_NAME_LEN + 1];
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char ClientCipherName[MAX_SIZE];
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SOCK_EVENT *SockEvent;
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QUEUE *RecvQueue; // Receive queue
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QUEUE *SendQueue; // Transmission queue
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INTERRUPT_MANAGER *Interrupt; // Interrupt manager
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bool Aborting; // Forced disconnection flag
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bool AbortSent; // Flag of whether to send the Abort
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bool AbortReceived; // Flag of whether the Abort has been received
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bool Disconnecting; // Disconnecting flag
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bool DisconnectSent; // Flag of whether to send a Disconnect
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bool DisconnectRecved; // Flag of whether a Disconnect has been received
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bool Disconnected; // Flag as to disconnect
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UINT Status; // State
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UCHAR SentNonce[SSTP_NONCE_SIZE]; // Random data sent
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TUBE *TubeRecv, *TubeSend; // Delivery tube of packets to PPP module
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THREAD *PPPThread; // PPP module thread
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UINT64 NextSendEchoRequestTick; // Time to send the next Echo Request
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UINT64 LastRecvTick; // Tick when some data has received at the end
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bool FlushRecvTube; // Flag whether to flush the reception tube
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UINT EstablishedCount; // Number of session establishment
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};
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//// Function prototype
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bool AcceptSstp(CONNECTION *c);
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bool ProcessSstpHttps(CEDAR *cedar, SOCK *s, SOCK_EVENT *se);
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SSTP_SERVER *NewSstpServer(CEDAR *cedar, IP *client_ip, UINT client_port, IP *server_ip,
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UINT server_port, SOCK_EVENT *se,
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char *client_host_name, char *crypt_name);
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void FreeSstpServer(SSTP_SERVER *s);
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void SstpProcessInterrupt(SSTP_SERVER *s);
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SSTP_PACKET *SstpParsePacket(UCHAR *data, UINT size);
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LIST *SstpParseAttributeList(UCHAR *data, UINT size, SSTP_PACKET *p);
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SSTP_ATTRIBUTE *SstpParseAttribute(UCHAR *data, UINT size);
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void SstpFreeAttribute(SSTP_ATTRIBUTE *a);
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void SstpFreeAttributeList(LIST *o);
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void SstpFreePacket(SSTP_PACKET *p);
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BUF *SstpBuildPacket(SSTP_PACKET *p);
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BUF *SstpBuildAttributeList(LIST *o, USHORT message_type);
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BUF *SstpBuildAttribute(SSTP_ATTRIBUTE *a);
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void SstpAbort(SSTP_SERVER *s);
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void SstpDisconnect(SSTP_SERVER *s);
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void SstpProcessPacket(SSTP_SERVER *s, SSTP_PACKET *p);
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void SstpProcessControlPacket(SSTP_SERVER *s, SSTP_PACKET *p);
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void SstpProcessDataPacket(SSTP_SERVER *s, SSTP_PACKET *p);
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SSTP_ATTRIBUTE *SstpFindAttribute(SSTP_PACKET *p, UCHAR attribute_id);
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SSTP_ATTRIBUTE *SstpNewAttribute(UCHAR attribute_id, UCHAR *data, UINT data_size);
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SSTP_ATTRIBUTE *SstpNewStatusInfoAttribute(UCHAR attrib_id, UINT status);
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SSTP_ATTRIBUTE *SstpNewCryptoBindingRequestAttribute(UCHAR hash_protocol_bitmask, UCHAR *nonce_32bytes);
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SSTP_PACKET *SstpNewDataPacket(UCHAR *data, UINT size);
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SSTP_PACKET *SstpNewControlPacket(USHORT message_type);
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SSTP_PACKET *SstpNewControlPacketWithAnAttribute(USHORT message_type, SSTP_ATTRIBUTE *a);
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void SstpSendPacket(SSTP_SERVER *s, SSTP_PACKET *p);
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bool GetNoSstp();
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#endif // PROTO_SSTP_H
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