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wireshark/epan/dissectors/packet-sstp.c

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/* packet-sstp.c
* routines for sstp packet dissasembly
* - MS-SSTP:
*
* https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sstp
*
* Created as part of a semester project at the University of Applied Sciences Hagenberg
* (https://www.fh-ooe.at/en/hagenberg-campus/)
*
* Copyright (c) 2013:
* Hofer Manuel (manuel@mnlhfr.at)
* Nemeth Franz
* Scheipner Alexander
* Stiftinger Thomas
* Werner Sebastian
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-tcp.h"
void proto_register_sstp(void);
void proto_reg_handoff_sstp(void);
#define SSTP_BITMASK_MAJORVERSION 0xF0
#define SSTP_BITMASK_MINORVERSION 0x0F
#define SSTP_BITMASK_CONTROLFLAG 0x01
#define SSTP_BITMASK_LENGTH_RESERVED 0xF000
#define SSTP_BITMASK_LENGTH_LENGTH 0x0FFF
#define SSTP_CERT_HASH_PROTOCOL_SHA1 0x01
#define SSTP_CERT_HASH_PROTOCOL_SHA256 0x02
#define SSTP_ENCAPSULATED_PPP 0x0001
/* bytewise offsets inside the paket buffer */
#define SSTP_OFFSET_ATTRIBUTES 8
#define SSTP_OFFSET_DATA 4
#define SSTP_OFFSET_RESERVED 1
#define SSTP_OFFSET_ISCONTROL 1
#define SSTP_OFFSET_LENGTH 2
#define SSTP_OFFSET_MAJORVERSION 0
#define SSTP_OFFSET_MINORVERSION 0
#define SSTP_OFFSET_MSGTYPE 4
#define SSTP_OFFSET_NUMATTRIB 6
/* fieldsize in byte */
#define SSTP_FSIZE_ATTRIBUTE 4
#define SSTP_FSIZE_ATTRIB_ID 1
#define SSTP_FSIZE_ATTRIB_LENGTH 2
#define SSTP_FSIZE_ATTRIB_RESERVED 1
#define SSTP_FSIZE_CERT_HASH_SHA1 20
#define SSTP_FSIZE_CERT_HASH_SHA256 32
#define SSTP_FSIZE_COMPOUND_MAC_SHA1 20
#define SSTP_FSIZE_COMPOUND_MAC_SHA256 32
#define SSTP_FSIZE_ENCAPSULATED_PROTOCOL 2
#define SSTP_FSIZE_HASH_PROTOCOL 1
#define SSTP_FSIZE_HASH_PROTOCOL_BITMASK 1
#define SSTP_FSIZE_ISCONTROL 1
#define SSTP_FSIZE_LENGTH 2
#define SSTP_FSIZE_MAJORVERSION 1
#define SSTP_FSIZE_MINORVERSION 1
#define SSTP_FSIZE_MSGTYPE 2
#define SSTP_FSIZE_NONCE 32
#define SSTP_FSIZE_NUMATTRIB 2
#define SSTP_FSIZE_PADDING_SHA1 12
#define SSTP_FSIZE_RESERVED 1
#define SSTP_FSIZE_RESERVED2 3
#define SSTP_FSIZE_STATUS 4
/* Message types */
#define SSTP_MSG_CALL_ABORT 0x005
#define SSTP_MSG_CALL_CONNECTED 0x004
#define SSTP_MSG_CALL_CONNECT_ACK 0x002
#define SSTP_MSG_CALL_CONNECT_NAK 0x003
#define SSTP_MSG_CALL_CONNECT_REQUEST 0x001
#define SSTP_MSG_CALL_DISCONNECT 0x006
#define SSTP_MSG_CALL_DISCONNECT_ACK 0x007
#define SSTP_MSG_ECHO_REQUEST 0x008
#define SSTP_MSG_ECHO_RESPONSE 0x009
/* Attribute Types */
#define SSTP_ATTRIB_CRYPTO_BINDING 3
#define SSTP_ATTRIB_CRYPTO_BINDING_REQ 4
#define SSTP_ATTRIB_ENCAPSULATED_PROTOCOL_ID 1
#define SSTP_ATTRIB_NO_ERROR 0
#define SSTP_ATTRIB_STATUS_INFO 2
/* Status Types */
#define SSTP_ATTRIB_STATUS_ATTRIB_NOT_SUPPORTED_IN_MSG 0x000009
#define SSTP_ATTRIB_STATUS_DUPLICATE_ATTRIBUTE 0x000001
#define SSTP_ATTRIB_STATUS_INVALID_ATTRIB_VALUE_LENGTH 0x000003
#define SSTP_ATTRIB_STATUS_INVALID_FRAME_RECEIVED 0x000007
#define SSTP_ATTRIB_STATUS_NEGOTIATION_TIMEOUT 0x000008
#define SSTP_ATTRIB_STATUS_NO_ERROR 0x000000
#define SSTP_ATTRIB_STATUS_REQUIRED_ATTRIBUTE_MISSING 0x00000a
#define SSTP_ATTRIB_STATUS_RETRY_COUNT_EXCEEDED 0x000006
#define SSTP_ATTRIB_STATUS_STATUS_INFO_NOT_SUPPORTED_IN_MSG 0x00000b
#define SSTP_ATTRIB_STATUS_UNACCEPTED_FRAME_RECEIVED 0x000005
#define SSTP_ATTRIB_STATUS_UNRECOGNIZED_ATTRIBUTE 0x000002
#define SSTP_ATTRIB_STATUS_VALUE_NOT_SUPPORTED 0x000004
static dissector_handle_t ppp_hdlc_handle = NULL;
static gint ett_sstp = -1;
static gint ett_sstp_attribute = -1;
static gint ett_sstp_version = -1;
static gint hf_sstp_attrib_id = -1;
static gint hf_sstp_attrib_length = -1;
static gint hf_sstp_attrib_length_reserved = -1;
static gint hf_sstp_attrib_reserved = -1;
static gint hf_sstp_attrib_value = -1;
static gint hf_sstp_cert_hash = -1;
static gint hf_sstp_compound_mac = -1;
static gint hf_sstp_control_flag = -1;
static gint hf_sstp_data_unknown = -1;
static gint hf_sstp_ecapsulated_protocol = -1;
static gint hf_sstp_hash_protocol = -1;
static gint hf_sstp_length = -1;
static gint hf_sstp_major = -1;
static gint hf_sstp_messagetype = -1;
static gint hf_sstp_minor = -1;
static gint hf_sstp_nonce = -1;
static gint hf_sstp_numattrib = -1;
static gint hf_sstp_padding = -1;
static gint hf_sstp_reserved = -1;
static gint hf_sstp_status = -1;
static gint proto_sstp = -1;
static const value_string sstp_messagetypes[] = {
{SSTP_MSG_CALL_CONNECT_REQUEST, "SSTP_MSG_CALL_CONNECT_REQUEST"},
{SSTP_MSG_CALL_CONNECT_ACK, "SSTP_MSG_CALL_CONNECT_ACK"},
{SSTP_MSG_CALL_CONNECT_NAK, "SSTP_MSG_CALL_CONNECT_NAK"},
{SSTP_MSG_CALL_CONNECTED, "SSTP_MSG_CALL_CONNECTED"},
{SSTP_MSG_CALL_ABORT, "SSTP_MSG_CALL_ABORT"},
{SSTP_MSG_CALL_DISCONNECT, "SSTP_MSG_CALL_DISCONNECT"},
{SSTP_MSG_CALL_DISCONNECT_ACK, "SSTP_MSG_CALL_DISCONNECT_ACK"},
{SSTP_MSG_ECHO_REQUEST, "SSTP_MSG_ECHO_REQUEST"},
{SSTP_MSG_ECHO_RESPONSE, "SSTP_MSG_ECHO_RESPONSE"},
{0, NULL}
};
static const value_string sstp_attributes[] = {
{SSTP_ATTRIB_NO_ERROR, "SSTP_ATTRIB_NO_ERROR"},
{SSTP_ATTRIB_ENCAPSULATED_PROTOCOL_ID, "SSTP_ATTRIB_ENCAPSULATED_PROTOCOL_ID"},
{SSTP_ATTRIB_STATUS_INFO, "SSTP_ATTRIB_STATUS_INFO"},
{SSTP_ATTRIB_CRYPTO_BINDING, "SSTP_ATTRIB_CRYPTO_BINDING"},
{SSTP_ATTRIB_CRYPTO_BINDING_REQ, "SSTP_ATTRIB_CRYPTO_BINDING_REQ"},
{0, NULL}
};
static const value_string encapsulated_protocols[] = {
{SSTP_ENCAPSULATED_PPP, "PPP"},
{0, NULL}
};
static const value_string hash_protocols[] = {
{SSTP_CERT_HASH_PROTOCOL_SHA1, "SHA1"},
{SSTP_CERT_HASH_PROTOCOL_SHA256, "SHA256"},
{0, NULL}
};
static const value_string attrib_status[] = {
{SSTP_ATTRIB_STATUS_NO_ERROR, "SSTP_ATTRIB_STATUS_NO_ERROR"},
{SSTP_ATTRIB_STATUS_DUPLICATE_ATTRIBUTE, "SSTP_ATTRIB_STATUS_DUPLICATE_ATTRIBUTE"},
{SSTP_ATTRIB_STATUS_UNRECOGNIZED_ATTRIBUTE, "SSTP_ATTRIB_STATUS_UNRECOGNIZED_ATTRIBUTE"},
{SSTP_ATTRIB_STATUS_INVALID_ATTRIB_VALUE_LENGTH , "SSTP_ATTRIB_STATUS_INVALID_ATTRIB_VALUE_LENGTH"},
{SSTP_ATTRIB_STATUS_VALUE_NOT_SUPPORTED, "SSTP_ATTRIB_STATUS_VALUE_NOT_SUPPORTED"},
{SSTP_ATTRIB_STATUS_UNACCEPTED_FRAME_RECEIVED, "SSTP_ATTRIB_STATUS_UNACCEPTED_FRAME_RECEIVED"},
{SSTP_ATTRIB_STATUS_RETRY_COUNT_EXCEEDED, "SSTP_ATTRIB_STATUS_RETRY_COUNT_EXCEEDED"},
{SSTP_ATTRIB_STATUS_INVALID_FRAME_RECEIVED, "SSTP_ATTRIB_STATUS_INVALID_FRAME_RECEIVED"},
{SSTP_ATTRIB_STATUS_NEGOTIATION_TIMEOUT, "SSTP_ATTRIB_STATUS_NEGOTIATION_TIMEOUT"},
{SSTP_ATTRIB_STATUS_ATTRIB_NOT_SUPPORTED_IN_MSG, "SSTP_ATTRIB_STATUS_ATTRIB_NOT_SUPPORTED_IN_MSG"},
{SSTP_ATTRIB_STATUS_REQUIRED_ATTRIBUTE_MISSING, "SSTP_ATTRIB_STATUS_REQUIRED_ATTRIBUTE_MISSING"},
{SSTP_ATTRIB_STATUS_STATUS_INFO_NOT_SUPPORTED_IN_MSG, "SSTP_ATTRIB_STATUS_STATUS_INFO_NOT_SUPPORTED_IN_MSG"},
{0, NULL}
};
static int
dissect_sstp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
guint16 sstp_control_flag;
guint32 offset = 0;
guint8 sstp_major;
guint8 sstp_minor;
proto_item *ti;
proto_tree *sstp_tree;
proto_tree *sstp_tree_attribute;
proto_tree *sstp_tree_version;
guint16 sstp_numattrib;
tvbuff_t *tvb_next;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SSTP");
/* Clear out stuff in the info column */
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_sstp, tvb, 0, -1, ENC_NA);
sstp_tree = proto_item_add_subtree(ti, ett_sstp);
sstp_control_flag = tvb_get_guint8(tvb, SSTP_OFFSET_ISCONTROL) & SSTP_BITMASK_CONTROLFLAG;
sstp_minor = (tvb_get_guint8(tvb, SSTP_OFFSET_MINORVERSION) & SSTP_BITMASK_MINORVERSION); /* leftmost 4 bit */
sstp_major = (tvb_get_guint8(tvb, SSTP_OFFSET_MAJORVERSION) >> 4); /* rightmost 4 bit */
col_append_fstr(pinfo->cinfo, COL_INFO, "SSTP-%u.%u ", sstp_major, sstp_minor);
sstp_tree_version = proto_tree_add_subtree_format(sstp_tree, tvb, offset, SSTP_FSIZE_MAJORVERSION, ett_sstp_version,
NULL, "Version %d.%d", sstp_major, sstp_minor);
proto_tree_add_item(sstp_tree_version, hf_sstp_major, tvb, SSTP_OFFSET_MAJORVERSION, SSTP_FSIZE_MAJORVERSION, ENC_BIG_ENDIAN);
proto_tree_add_item(sstp_tree_version, hf_sstp_minor, tvb, SSTP_OFFSET_MINORVERSION, SSTP_FSIZE_MINORVERSION, ENC_BIG_ENDIAN);
proto_tree_add_item(sstp_tree, hf_sstp_reserved, tvb, SSTP_OFFSET_RESERVED, SSTP_FSIZE_RESERVED, ENC_NA);
proto_tree_add_item(sstp_tree, hf_sstp_control_flag, tvb, SSTP_OFFSET_ISCONTROL, SSTP_FSIZE_ISCONTROL, ENC_BIG_ENDIAN);
proto_tree_add_item(sstp_tree, hf_sstp_length, tvb, SSTP_OFFSET_LENGTH, SSTP_FSIZE_LENGTH, ENC_BIG_ENDIAN);
/* check wether we got a control or data packet */
if (sstp_control_flag) {
guint16 sstp_messagetype = tvb_get_guint16(tvb, SSTP_OFFSET_MSGTYPE, ENC_BIG_ENDIAN);
col_append_fstr(pinfo->cinfo, COL_INFO, "Type: CONTROL, %s; ", val_to_str(sstp_messagetype, sstp_messagetypes, "Unknown Messagetype"));
proto_tree_add_item(sstp_tree, hf_sstp_messagetype, tvb, SSTP_OFFSET_MSGTYPE, SSTP_FSIZE_MSGTYPE, ENC_BIG_ENDIAN);
proto_tree_add_item(sstp_tree, hf_sstp_numattrib, tvb, SSTP_OFFSET_NUMATTRIB, SSTP_FSIZE_NUMATTRIB, ENC_BIG_ENDIAN);
sstp_numattrib = tvb_get_ntohs(tvb, SSTP_OFFSET_NUMATTRIB);
/* display attributes */
if (sstp_numattrib > 0) {
guint16 attrib_length = 0;
guint8 attrib_id = 0;
guint8 hashproto = 0;
offset = SSTP_OFFSET_ATTRIBUTES;
for(;sstp_numattrib > 0; sstp_numattrib--) {
/* read attribute id and create subtree for attribute */
attrib_id = tvb_get_guint8(tvb, offset+1);
sstp_tree_attribute = proto_tree_add_subtree_format(sstp_tree, tvb, offset, SSTP_FSIZE_ATTRIB_RESERVED, ett_sstp_attribute,
NULL, "Attribute %s", val_to_str(attrib_id, sstp_attributes, "Unknown Attribute"));
proto_tree_add_item(sstp_tree_attribute, hf_sstp_attrib_reserved, tvb, offset, SSTP_FSIZE_ATTRIB_RESERVED, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_attrib_id, tvb, offset, SSTP_FSIZE_ATTRIB_ID, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_attrib_length_reserved, tvb, offset, SSTP_FSIZE_ATTRIB_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(sstp_tree_attribute, hf_sstp_attrib_length, tvb, offset, SSTP_FSIZE_ATTRIB_LENGTH, ENC_BIG_ENDIAN);
/* get length of attribute value */
attrib_length = (tvb_get_ntohs(tvb, offset) & SSTP_BITMASK_LENGTH_LENGTH);
/* if this attribute follows the specification, length should at least be 4 */
if (attrib_length >= 4) {
/* length field also contains the previously processed 4 bytes */
attrib_length -= 4;
}
offset += 2;
/* attributes that need special treatment... */
switch(attrib_id) {
case SSTP_ATTRIB_ENCAPSULATED_PROTOCOL_ID:
proto_tree_add_item(sstp_tree_attribute, hf_sstp_ecapsulated_protocol, tvb, offset, SSTP_FSIZE_ENCAPSULATED_PROTOCOL, ENC_BIG_ENDIAN);
offset += SSTP_FSIZE_ENCAPSULATED_PROTOCOL;
break;
case SSTP_ATTRIB_STATUS_INFO:
proto_tree_add_item(sstp_tree_attribute, hf_sstp_reserved, tvb, offset, SSTP_FSIZE_RESERVED2, ENC_NA);
offset += SSTP_FSIZE_RESERVED2;
attrib_length -= SSTP_FSIZE_RESERVED2;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_attrib_id, tvb, offset, SSTP_FSIZE_ATTRIB_ID, ENC_BIG_ENDIAN);
offset += SSTP_FSIZE_ATTRIB_ID;
attrib_length -= SSTP_FSIZE_ATTRIB_ID;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_status, tvb, offset, SSTP_FSIZE_STATUS, ENC_BIG_ENDIAN);
offset += SSTP_FSIZE_STATUS;
attrib_length -= SSTP_FSIZE_STATUS;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_attrib_value, tvb, offset, attrib_length, ENC_NA);
offset += attrib_length;
break;
case SSTP_ATTRIB_CRYPTO_BINDING:
proto_tree_add_item(sstp_tree_attribute, hf_sstp_reserved, tvb, offset, SSTP_FSIZE_RESERVED2, ENC_NA);
offset += SSTP_FSIZE_RESERVED2;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_hash_protocol, tvb, offset, SSTP_FSIZE_HASH_PROTOCOL, ENC_BIG_ENDIAN);
hashproto = tvb_get_guint8(tvb, offset);
offset += SSTP_FSIZE_HASH_PROTOCOL;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_nonce, tvb, offset, SSTP_FSIZE_NONCE, ENC_NA);
offset += SSTP_FSIZE_NONCE;
if (hashproto == SSTP_CERT_HASH_PROTOCOL_SHA1) {
proto_tree_add_item(sstp_tree_attribute, hf_sstp_cert_hash, tvb, offset, SSTP_FSIZE_CERT_HASH_SHA1, ENC_NA);
offset += SSTP_FSIZE_CERT_HASH_SHA1;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_padding, tvb, offset, SSTP_FSIZE_PADDING_SHA1, ENC_NA);
offset += SSTP_FSIZE_PADDING_SHA1;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_compound_mac, tvb, offset, SSTP_FSIZE_COMPOUND_MAC_SHA1, ENC_NA);
offset += SSTP_FSIZE_COMPOUND_MAC_SHA1;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_padding, tvb, offset, SSTP_FSIZE_PADDING_SHA1, ENC_NA);
offset += SSTP_FSIZE_PADDING_SHA1;
}
if (hashproto == SSTP_CERT_HASH_PROTOCOL_SHA256) {
proto_tree_add_item(sstp_tree_attribute, hf_sstp_cert_hash, tvb, offset, SSTP_FSIZE_CERT_HASH_SHA256, ENC_NA);
offset += SSTP_FSIZE_CERT_HASH_SHA256;
}
break;
case SSTP_ATTRIB_CRYPTO_BINDING_REQ:
proto_tree_add_item(sstp_tree_attribute, hf_sstp_reserved, tvb, offset, SSTP_FSIZE_RESERVED2, ENC_NA);
offset += SSTP_FSIZE_RESERVED2;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_hash_protocol, tvb, offset, SSTP_FSIZE_HASH_PROTOCOL, ENC_BIG_ENDIAN);
offset += SSTP_FSIZE_HASH_PROTOCOL;
proto_tree_add_item(sstp_tree_attribute, hf_sstp_nonce, tvb, offset, SSTP_FSIZE_NONCE, ENC_NA);
offset += SSTP_FSIZE_NONCE;
break;
}
}
}
/* While testing with different dumps, i noticed data in the buffer i couldnt find any documentation about */
if (tvb_reported_length_remaining(tvb, offset) > 0) {
proto_tree_add_item(sstp_tree, hf_sstp_data_unknown, tvb, offset, -1, ENC_NA);
}
} else {
col_append_fstr(pinfo->cinfo, COL_INFO, "Type: DATA; ");
/* our work here is done, since sstp encapsulates ppp, we hand the remaining buffer
over to the ppp dissector for further analysis */
tvb_next = tvb_new_subset_remaining(tvb, SSTP_OFFSET_DATA);
call_dissector(ppp_hdlc_handle, tvb_next, pinfo, tree);
}
return tvb_captured_length(tvb);
}
static guint
get_sstp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
{
return tvb_get_ntohs(tvb, offset+SSTP_OFFSET_LENGTH);
}
static int
dissect_sstp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
tcp_dissect_pdus(tvb, pinfo, tree, TRUE, SSTP_OFFSET_LENGTH+SSTP_FSIZE_LENGTH, get_sstp_pdu_len, dissect_sstp_pdu, data);
return tvb_captured_length(tvb);
}
void
proto_register_sstp(void)
{
/* Setting up header data structure */
static hf_register_info hf[] = {
/* sstp minor version (4 Bit) */
{ &hf_sstp_major,
{ "Major Version", "sstp.majorversion",
FT_UINT8, BASE_DEC,
NULL, SSTP_BITMASK_MAJORVERSION,
NULL, HFILL }
},
/* sstp major version (4 Bit) */
{ &hf_sstp_minor,
{ "Minor Version", "sstp.minorversion",
FT_UINT8, BASE_DEC,
NULL, SSTP_BITMASK_MINORVERSION,
NULL, HFILL }
},
/* Several Reserved Fields with different size */
{ &hf_sstp_reserved,
{ "Reserved", "sstp.reserved",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* C (1 Bit, set to 1 if control packet, 0 means data packet) */
{ &hf_sstp_control_flag,
{ "Control Packet", "sstp.iscontrol",
FT_BOOLEAN, 8,
NULL, SSTP_BITMASK_CONTROLFLAG,
NULL, HFILL }
},
/* Length Packet (16 Bit) */
{ &hf_sstp_length,
{ "Length-Packet", "sstp.length",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
/* Message Type (16 Bit) */
{ &hf_sstp_messagetype,
{ "Message Type", "sstp.messagetype",
FT_UINT16, BASE_HEX,
VALS(sstp_messagetypes), 0x0,
NULL, HFILL }
},
/* Number of Attributes (16 Bit) */
{ &hf_sstp_numattrib,
{ "Number of Attributes", "sstp.numattrib",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
/* Fields for Attributes */
/* Attribute Reserved Field (8 Bit) */
{ &hf_sstp_attrib_reserved,
{ "Reserved", "sstp.attribreserved",
FT_UINT8, BASE_HEX,
NULL, 0x0,
NULL, HFILL }
},
/* Attribute ID (8 Bit) */
{ &hf_sstp_attrib_id,
{ "ID", "sstp.attribid",
FT_UINT8, BASE_DEC,
VALS(sstp_attributes), 0x0,
NULL, HFILL }
},
/* Attribute Length Reserved (4 Bit reserved for future use inside the 16 bit length field) */
{ &hf_sstp_attrib_length_reserved,
{ "Reserved", "sstp.attriblengthreserved",
FT_UINT16, BASE_HEX,
NULL, SSTP_BITMASK_LENGTH_RESERVED,
NULL, HFILL }
},
/* Attribute Length Actual Length (12 Bit) */
{ &hf_sstp_attrib_length,
{ "Length", "sstp.attriblength",
FT_UINT16, BASE_DEC,
NULL, SSTP_BITMASK_LENGTH_LENGTH,
NULL, HFILL }
},
/* Undocumented Data in SSTP_MSG_CALL_CONNECT_REQUEST
see also MS-SSTP section 2.2.9 "Call Connect Request Message
(SSTP_MSG_CALL_CONNECT_REQUEST)":
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sstp/e73ced14-7bef-407b-a85b-a6f624324dd1
*/
{ &hf_sstp_data_unknown,
{ "Unknown Data", "sstp.dataunknown",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* Hash Protocol (8 Bit) */
{ &hf_sstp_hash_protocol,
{ "Hash Protocol", "sstp.hash",
FT_UINT8, BASE_HEX,
VALS(hash_protocols), 0x0,
NULL, HFILL }
},
/* Nonce (256 Bit) */
{ &hf_sstp_nonce,
{ "Nonce", "sstp.nonce",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* Cert Hash (20 Bytes if SHA1 is used, 32 Bytes with SHA256) */
{ &hf_sstp_cert_hash,
{ "Cert Hash", "sstp.cert_hash",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* Cert Padding (0 Bytes if SHA256 is used, 12 Bytes with SHA1) */
{ &hf_sstp_padding,
{ "Padding", "sstp.padding",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* Compound MAC (20 Bytes if SHA1 is used, 32 Bytes with SHA1) */
{ &hf_sstp_compound_mac,
{ "Compound Mac", "sstp.compoundmac",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* Encapsulated Protocol (2 Bytes) */
{ &hf_sstp_ecapsulated_protocol,
{ "Encapsulated Protocol", "sstp.encapsulatedprotocol",
FT_UINT16, BASE_HEX,
VALS(encapsulated_protocols), 0x0,
NULL, HFILL }
},
/* Attribute Status (4 Bytes) */
{ &hf_sstp_status,
{ "Status", "sstp.status",
FT_UINT32, BASE_HEX,
VALS(attrib_status), 0x0,
NULL, HFILL }
},
/* Attribute Value (Variable Length) */
{ &hf_sstp_attrib_value,
{ "Attribute Value", "sstp.attribvalue",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_sstp,
&ett_sstp_attribute,
&ett_sstp_version
};
proto_sstp = proto_register_protocol("Secure Socket Tunneling Protocol", "SSTP", "sstp");
register_dissector("sstp", dissect_sstp, proto_sstp);
proto_register_field_array(proto_sstp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_sstp(void)
{
ppp_hdlc_handle = find_dissector_add_dependency("ppp_hdlc", proto_sstp);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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