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#ifndef SSTP_PROT_H
#define SSTP_PROT_H
#include <stdint.h>
/* Constants */
#define SSTP_PORT 443
#define SSTP_HTTP_METHOD "SSTP_DUPLEX_POST"
#define SSTP_HTTP_URI "/sra_{BA195980-CD49-458b-9E23-C84EE0ADCD75}/"
#define SSTP_VERSION 0x10
#define SSTP_MAX_PACKET_SIZE 4095
#define SSTP_NONCE_SIZE 32
#define SSTP_HLAK_SIZE 32
#define SSTP_CMK_SEED "SSTP inner method derived CMK"
#define SSTP_CMK_SEED_SIZE 29
#define SSTP_NEGOTIOATION_TIMEOUT 60
#define SSTP_HELLO_TIMEOUT 60
#define SSTP_ABORT_TIMEOUT_1 3
#define SSTP_ABORT_TIMEOUT_2 1
#define SSTP_DISCONNECT_TIMEOUT_1 5
#define SSTP_DISCONNECT_TIMEOUT_2 1
/* Packet Type */
enum {
SSTP_DATA_PACKET = 0x00,
SSTP_CTRL_PACKET = 0x01,
};
/* Message Type */
enum {
SSTP_MSG_CALL_CONNECT_REQUEST = 0x0001,
SSTP_MSG_CALL_CONNECT_ACK = 0x0002,
SSTP_MSG_CALL_CONNECT_NAK = 0x0003,
SSTP_MSG_CALL_CONNECTED = 0x0004,
SSTP_MSG_CALL_ABORT = 0x0005,
SSTP_MSG_CALL_DISCONNECT = 0x0006,
SSTP_MSG_CALL_DISCONNECT_ACK = 0x0007,
SSTP_MSG_ECHO_REQUEST = 0x0008,
SSTP_MSG_ECHO_RESPONSE = 0x0009,
};
/* Attribute ID */
enum {
SSTP_ATTRIB_NO_ERROR = 0x00,
SSTP_ATTRIB_ENCAPSULATED_PROTOCOL_ID = 0x01,
SSTP_ATTRIB_STATUS_INFO = 0x02,
SSTP_ATTRIB_CRYPTO_BINDING = 0x03,
SSTP_ATTRIB_CRYPTO_BINDING_REQ = 0x04,
};
/* Protocol ID */
enum {
SSTP_ENCAPSULATED_PROTOCOL_PPP = 0x0001,
};
/* Hash Protocol Bitmask */
enum {
CERT_HASH_PROTOCOL_SHA1 = 0x01,
CERT_HASH_PROTOCOL_SHA256 = 0x02,
};
/* Status */
enum {
ATTRIB_STATUS_NO_ERROR = 0x00000000,
ATTRIB_STATUS_DUPLICATE_ATTRIBUTE = 0x00000001,
ATTRIB_STATUS_UNRECOGNIZED_ATTRIBUTE = 0x00000002,
ATTRIB_STATUS_INVALID_ATTRIB_VALUE_LENGTH = 0x00000003,
ATTRIB_STATUS_VALUE_NOT_SUPPORTED = 0x00000004,
ATTRIB_STATUS_UNACCEPTED_FRAME_RECEIVED = 0x00000005,
ATTRIB_STATUS_RETRY_COUNT_EXCEEDED = 0x00000006,
ATTRIB_STATUS_INVALID_FRAME_RECEIVED = 0x00000007,
ATTRIB_STATUS_NEGOTIATION_TIMEOUT = 0x00000008,
ATTRIB_STATUS_ATTRIB_NOT_SUPPORTED_IN_MSG = 0x00000009,
ATTRIB_STATUS_REQUIRED_ATTRIBUTE_MISSING = 0x0000000a,
ATTRIB_STATUS_STATUS_INFO_NOT_SUPPORTED_IN_MSG = 0x0000000b,
};
/* State */
enum {
STATE_SERVER_CALL_DISCONNECTED = 0,
STATE_SERVER_CONNECT_REQUEST_PENDING,
STATE_SERVER_CALL_CONNECTED_PENDING,
STATE_SERVER_CALL_CONNECTED,
STATE_CALL_ABORT_IN_PROGRESS_1,
STATE_CALL_ABORT_IN_PROGRESS_2,
STATE_CALL_ABORT_TIMEOUT_PENDING,
STATE_CALL_ABORT_PENDING,
STATE_CALL_DISCONNECT_IN_PROGRESS_1,
STATE_CALL_DISCONNECT_IN_PROGRESS_2,
STATE_CALL_DISCONNECT_TIMEOUT_PENDING,
STATE_CALL_DISCONNECT_ACK_PENDING,
};
/* Packets */
struct sstp_hdr {
uint8_t version;
uint8_t reserved;
uint16_t length;
uint8_t data[0];
} __attribute__((packed));
struct sstp_ctrl_hdr {
uint8_t version;
uint8_t reserved;
uint16_t length;
uint16_t message_type;
uint16_t num_attributes;
uint8_t data[0];
} __attribute__((packed));
struct sstp_attr_hdr {
uint8_t reserved;
uint8_t attribute_id;
uint16_t length;
uint8_t data[0];
} __attribute__((packed));
struct sstp_attrib_encapsulated_protocol {
struct sstp_attr_hdr hdr;
uint16_t protocol_id;
} __attribute__((packed));
struct sstp_attrib_status_info {
struct sstp_attr_hdr hdr;
uint8_t reserved[3];
uint8_t attrib_id;
uint32_t status;
uint8_t attrib_value[0];
} __attribute__((packed));
struct sstp_attrib_crypto_binding {
struct sstp_attr_hdr hdr;
uint8_t reserved[3];
uint8_t hash_protocol_bitmask;
uint8_t nonce[SSTP_NONCE_SIZE];
uint8_t cert_hash[32];
uint8_t compound_mac[32];
} __attribute__((packed));
struct sstp_attrib_crypto_binding_request {
struct sstp_attr_hdr hdr;
uint8_t reserved[3];
uint8_t hash_protocol_bitmask;
uint8_t nonce[SSTP_NONCE_SIZE];
} __attribute__((packed));
#define SSTP_DATA_HDR(len) { \
.version = SSTP_VERSION, \
.reserved = SSTP_DATA_PACKET, \
.length = htons(len), \
}
#define SSTP_CTRL_HDR(type, len, num) { \
.version = SSTP_VERSION, \
.reserved = SSTP_CTRL_PACKET, \
.length = htons(len), \
.message_type = htons(type), \
.num_attributes = htons(num) \
}
#define SSTP_ATTR_HDR(id, len) { \
.attribute_id = id, \
.length = htons(len) \
}
#define INIT_SSTP_DATA_HDR(hdr, len) { \
(hdr)->version = SSTP_VERSION; \
(hdr)->reserved = SSTP_DATA_PACKET; \
(hdr)->length = htons(len); \
}
#define INIT_SSTP_CTRL_HDR(hdr, type, num, len) {\
(hdr)->version = SSTP_VERSION; \
(hdr)->reserved = SSTP_CTRL_PACKET; \
(hdr)->length = htons(len); \
(hdr)->message_type = htons(type); \
(hdr)->num_attributes = htons(num); \
}
#define INIT_SSTP_ATTR_HDR(hdr, id, len) { \
(hdr)->attribute_id = id; \
(hdr)->length = htons(len); \
}
#endif
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