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https://github.com/SoftEtherVPN/SoftEtherVPN.git
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263 lines
11 KiB
C
263 lines
11 KiB
C
// SoftEther VPN Source Code - Developer Edition Master Branch
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// Cedar Communication Module
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//
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// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
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//
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// Copyright (c) Daiyuu Nobori.
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// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
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// Copyright (c) SoftEther Corporation.
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//
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// All Rights Reserved.
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//
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// http://www.softether.org/
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//
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// Author: Daiyuu Nobori, Ph.D.
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// Comments: Tetsuo Sugiyama, Ph.D.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// version 2 as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License version 2
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
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// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
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//
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//
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// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
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// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
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// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
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// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
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// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
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// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
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// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
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// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
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// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
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// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
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// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
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// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
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// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
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// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
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//
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// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS
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// YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY
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// CRIMINAL LAWS OR CIVIL RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS
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// SOFTWARE IN OTHER COUNTRIES IS COMPLETELY AT YOUR OWN RISK. THE
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// SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO
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// COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING
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// PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER COUNTRIES' LAWS OR
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// CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES. WE HAVE
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// NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
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// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+
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// COUNTRIES AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE
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// WORLD, WITH DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY
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// COUNTRIES' LAWS, REGULATIONS AND CIVIL RIGHTS TO MAKE THE SOFTWARE
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// COMPLY WITH ALL COUNTRIES' LAWS BY THE PROJECT. EVEN IF YOU WILL BE
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// SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR
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// COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE LIABLE TO
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// RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
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// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT
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// JUST A STATEMENT FOR WARNING AND DISCLAIMER.
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//
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//
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// SOURCE CODE CONTRIBUTION
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// ------------------------
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//
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// Your contribution to SoftEther VPN Project is much appreciated.
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// Please send patches to us through GitHub.
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// Read the SoftEther VPN Patch Acceptance Policy in advance:
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// http://www.softether.org/5-download/src/9.patch
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//
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//
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// DEAR SECURITY EXPERTS
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// ---------------------
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//
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// If you find a bug or a security vulnerability please kindly inform us
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// about the problem immediately so that we can fix the security problem
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// to protect a lot of users around the world as soon as possible.
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//
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// Our e-mail address for security reports is:
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// softether-vpn-security [at] softether.org
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//
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// Please note that the above e-mail address is not a technical support
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// inquiry address. If you need technical assistance, please visit
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// http://www.softether.org/ and ask your question on the users forum.
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//
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// Thank you for your cooperation.
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//
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//
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// NO MEMORY OR RESOURCE LEAKS
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// ---------------------------
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//
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// The memory-leaks and resource-leaks verification under the stress
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// test has been passed before release this source code.
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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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void SetNoSstp(bool b);
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#endif // PROTO_SSTP_H
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