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// SoftEther VPN Source Code
// Cedar Communication Module
//
// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
//
// Copyright (c) 2012-2014 Daiyuu Nobori.
// Copyright (c) 2012-2014 SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) 2012-2014 SoftEther Corporation.
//
// All Rights Reserved.
//
// http://www.softether.org/
//
// Author: Daiyuu Nobori
// Comments: Tetsuo Sugiyama, Ph.D.
//
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// version 2 as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License version 2
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
//
//
// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
//
// USE ONLY IN JAPAN. DO NOT USE IT IN OTHER COUNTRIES. IMPORTING THIS
// SOFTWARE INTO OTHER COUNTRIES IS AT YOUR OWN RISK. SOME COUNTRIES
// PROHIBIT ENCRYPTED COMMUNICATIONS. USING THIS SOFTWARE IN OTHER
// COUNTRIES MIGHT BE RESTRICTED.
//
//
// SOURCE CODE CONTRIBUTION
// ------------------------
//
// Your contribution to SoftEther VPN Project is much appreciated.
// Please send patches to us through GitHub.
// Read the SoftEther VPN Patch Acceptance Policy in advance:
// http://www.softether.org/5-download/src/9.patch
//
//
// DEAR SECURITY EXPERTS
// ---------------------
//
// If you find a bug or a security vulnerability please kindly inform us
// about the problem immediately so that we can fix the security problem
// to protect a lot of users around the world as soon as possible.
//
// Our e-mail address for security reports is:
// softether-vpn-security [at] softether.org
//
// Please note that the above e-mail address is not a technical support
// inquiry address. If you need technical assistance, please visit
// http://www.softether.org/ and ask your question on the users forum.
//
// Thank you for your cooperation.
// IPsec_PPP.h
// Header of IPsec_PPP.c
#ifndef IPSEC_PPP_H
#define IPSEC_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)
#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_CODE_IS_RESPONSE(protocol, c) ((((protocol) == PPP_PROTOCOL_LCP || (protocol) == PPP_PROTOCOL_IPCP) && PPP_LCP_CODE_IS_RESPONSE(c)) || (((protocol) == PPP_PROTOCOL_PAP) && PPP_PAP_CODE_IS_RESPONSE(c)))
#define PPP_CODE_IS_REQUEST(protocol, c) ((((protocol) == PPP_PROTOCOL_LCP || (protocol) == PPP_PROTOCOL_IPCP) && PPP_LCP_CODE_IS_REQUEST(c)) || (((protocol) == PPP_PROTOCOL_PAP) && PPP_PAP_CODE_IS_REQUEST(c)) || ((protocol) == PPP_PROTOCOL_CHAP))
#define PPP_CODE_IS_WITH_OPTION_LIST(protocol, c) ((((protocol) == PPP_PROTOCOL_LCP || (protocol) == PPP_PROTOCOL_IPCP) && 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_IP)
//// Constants
// Time-out value
#define PPP_PACKET_RECV_TIMEOUT 10000 // Timeout until the next packet is received
#define PPP_PACKET_RESEND_INTERVAL 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
// 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
// PPP protocol (for transfer)
#define PPP_PROTOCOL_IP 0x0021
// 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
// Authentication protocol
#define PPP_LCP_AUTH_PAP PPP_PROTOCOL_PAP
#define PPP_LCP_AUTH_CHAP PPP_PROTOCOL_CHAP
// Algorithm of CHAP
#define PPP_CHAP_ALG_MS_CHAP_V2 0x81
//// 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
};
// 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
PPP_PACKET *LastStoredPacket; // Packet that is stored at the last
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
};
// Function prototype
THREAD *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);
void PPPThread(THREAD *thread, void *param);
void FreePPPSession(PPP_SESSION *p);
void FreePPPOptionList(LIST *o);
void FreePPPLCP(PPP_LCP *c);
PPP_LCP *NewPPPLCP(UCHAR code, UCHAR id);
PPP_LCP *ParseLCP(USHORT protocol, void *data, UINT size);
BUF *BuildLCPData(PPP_LCP *c);
PPP_OPTION *GetOptionValue(PPP_LCP *c, UCHAR type);
PPP_PACKET *ParsePPPPacket(void *data, UINT size);
void FreePPPPacket(PPP_PACKET *pp);
void FreePPPPacketEx(PPP_PACKET *pp, bool no_free_struct);
BUF *BuildPPPPacketData(PPP_PACKET *pp);
PPP_OPTION *NewPPPOption(UCHAR type, void *data, UINT size);
bool PPPSendPacket(PPP_SESSION *p, PPP_PACKET *pp);
bool PPPSendPacketEx(PPP_SESSION *p, PPP_PACKET *pp, bool no_flush);
PPP_PACKET *PPPRecvPacket(PPP_SESSION *p, bool async);
PPP_PACKET *PPPRecvPacketWithLowLayerProcessing(PPP_SESSION *p, bool async);
PPP_PACKET *PPPRecvPacketForCommunication(PPP_SESSION *p);
void PPPStoreLastPacket(PPP_SESSION *p, PPP_PACKET *pp);
void PPPCleanTerminate(PPP_SESSION *p);
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);
bool PPPSendRequest(PPP_SESSION *p, USHORT protocol, PPP_LCP *c);
USHORT PPPContinueCurrentProtocolRequestListening(PPP_SESSION *p, USHORT protocol);
bool PPPContinueUntilFinishAllLCPOptionRequestsDetermined(PPP_SESSION *p);
PPP_PACKET *PPPRecvResponsePacket(PPP_SESSION *p, PPP_PACKET *req, USHORT expected_protocol, USHORT *received_protocol, bool finish_when_all_lcp_acked);
PPP_PACKET *PPPProcessRequestPacket(PPP_SESSION *p, PPP_PACKET *req);
void PPPSendEchoRequest(PPP_SESSION *p);
bool PPPParseUsername(CEDAR *cedar, char *src, ETHERIP_ID *dst);
bool IsHubExistsWithLock(CEDAR *cedar, char *hubname);
void GenerateNtPasswordHash(UCHAR *dst, char *password);
void GenerateNtPasswordHashHash(UCHAR *dst_hash, UCHAR *src_hash);
void MsChapV2Server_GenerateChallenge(UCHAR *dst);
void MsChapV2Client_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 // IPSEC_PPP_H
// Developed by SoftEther VPN Project at University of Tsukuba in Japan.
// Department of Computer Science has dozens of overly-enthusiastic geeks.
// Join us: http://www.tsukuba.ac.jp/english/admission/
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