// SoftEther VPN Source Code // Cedar Communication Module // // SoftEther VPN Server, Client and Bridge are free software under GPLv2. // // Copyright (c) 2012-2015 Daiyuu Nobori. // Copyright (c) 2012-2015 SoftEther VPN Project, University of Tsukuba, Japan. // Copyright (c) 2012-2015 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 THIS SOFTWARE IN ANOTHER COUNTRY UNLESS // YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY // CRIMINAL LAWS OR CIVIL RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS // SOFTWARE IN OTHER COUNTRIES IS COMPLETELY AT YOUR OWN RISK. THE // SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO // COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING // PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER COUNTRIES' LAWS OR // CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES. WE HAVE // NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR // INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+ // COUNTRIES AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE // WORLD, WITH DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY // COUNTRIES' LAWS, REGULATIONS AND CIVIL RIGHTS TO MAKE THE SOFTWARE // COMPLY WITH ALL COUNTRIES' LAWS BY THE PROJECT. EVEN IF YOU WILL BE // SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR // COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE LIABLE TO // RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL // RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT // JUST A STATEMENT FOR WARNING AND DISCLAIMER. // // // 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. // // // NO MEMORY OR RESOURCE LEAKS // --------------------------- // // The memory-leaks and resource-leaks verification under the stress // test has been passed before release this source code. // Connection.h // Header of Connection.c #ifndef CONNECTION_H #define CONNECTION_H // Magic number indicating that the packet is compressed #define CONNECTION_BULK_COMPRESS_SIGNATURE 0xDEADBEEFCAFEFACEULL #define KEEP_ALIVE_STRING "Internet Connection Keep Alive Packet" #define UPDATE_LAST_COMM_TIME(v, n) {if ((v) <= (n)) { v = (n); } } // KEEP CONNECT structure struct KEEP { LOCK *lock; // Lock bool Server; // Server mode volatile bool Halt; // Stop flag bool Enable; // Enable flag char ServerName[MAX_HOST_NAME_LEN + 1]; // Server name UINT ServerPort; // Server port number bool UdpMode; // UDP mode UINT Interval; // Packet transmission interval THREAD *Thread; // Connection thread EVENT *HaltEvent; // Stop event CANCEL *Cancel; // Cancel }; // SECURE_SIGN Structure struct SECURE_SIGN { char SecurePublicCertName[MAX_SECURE_DEVICE_FILE_LEN + 1]; // Secure device certificate name char SecurePrivateKeyName[MAX_SECURE_DEVICE_FILE_LEN + 1]; // Secure device secret key name X *ClientCert; // Client certificate UCHAR Random[SHA1_SIZE]; // Random value for signature UCHAR Signature[128]; // Signed data UINT UseSecureDeviceId; UINT BitmapId; // Bitmap ID }; // Function type declaration typedef bool (CHECK_CERT_PROC)(SESSION *s, CONNECTION *c, X *server_x, bool *expired); typedef bool (SECURE_SIGN_PROC)(SESSION *s, CONNECTION *c, SECURE_SIGN *sign); // RC4 key pair struct RC4_KEY_PAIR { UCHAR ServerToClientKey[16]; UCHAR ClientToServerKey[16]; }; // Client Options struct CLIENT_OPTION { wchar_t AccountName[MAX_ACCOUNT_NAME_LEN + 1]; // Connection setting name char Hostname[MAX_HOST_NAME_LEN + 1]; // Host name UINT Port; // Port number UINT PortUDP; // UDP port number (0: Use only TCP) UINT ProxyType; // Type of proxy char ProxyName[MAX_HOST_NAME_LEN + 1]; // Proxy server name UINT ProxyPort; // Port number of the proxy server char ProxyUsername[MAX_PROXY_USERNAME_LEN + 1]; // Maximum user name length char ProxyPassword[MAX_PROXY_PASSWORD_LEN + 1]; // Maximum password length UINT NumRetry; // Automatic retries UINT RetryInterval; // Retry interval char HubName[MAX_HUBNAME_LEN + 1]; // HUB name UINT MaxConnection; // Maximum number of concurrent TCP connections bool UseEncrypt; // Use encrypted communication bool UseCompress; // Use data compression bool HalfConnection; // Use half connection in TCP bool NoRoutingTracking; // Disable the routing tracking char DeviceName[MAX_DEVICE_NAME_LEN + 1]; // VLAN device name UINT AdditionalConnectionInterval; // Connection attempt interval when additional connection establish UINT ConnectionDisconnectSpan; // Disconnection interval bool HideStatusWindow; // Hide the status window bool HideNicInfoWindow; // Hide the NIC status window bool RequireMonitorMode; // Monitor port mode bool RequireBridgeRoutingMode; // Bridge or routing mode bool DisableQoS; // Disable the VoIP / QoS function bool FromAdminPack; // For Administration Pack bool NoTls1; // Do not use TLS 1.0 bool NoUdpAcceleration; // Do not use UDP acceleration mode UCHAR HostUniqueKey[SHA1_SIZE]; // Host unique key }; // Client authentication data struct CLIENT_AUTH { UINT AuthType; // Authentication type char Username[MAX_USERNAME_LEN + 1]; // User name UCHAR HashedPassword[SHA1_SIZE]; // Hashed passwords char PlainPassword[MAX_PASSWORD_LEN + 1]; // Password X *ClientX; // Client certificate K *ClientK; // Client private key char SecurePublicCertName[MAX_SECURE_DEVICE_FILE_LEN + 1]; // Secure device certificate name char SecurePrivateKeyName[MAX_SECURE_DEVICE_FILE_LEN + 1]; // Secure device secret key name CHECK_CERT_PROC *CheckCertProc; // Server certificate confirmation procedure SECURE_SIGN_PROC *SecureSignProc; // Security signing procedure }; // TCP socket data structure struct TCPSOCK { SOCK *Sock; // Socket FIFO *RecvFifo; // Reception buffer FIFO *SendFifo; // Transmission buffer UINT Mode; // Read mode UINT WantSize; // Requested data size UINT NextBlockNum; // Total number of blocks that can be read next UINT NextBlockSize; // Block size that is planned to read next UINT CurrentPacketNum; // Current packet number UINT64 LastCommTime; // Last communicated time UINT64 LastRecvTime; // Time the last data received UINT LateCount; // The number of delay occurences UINT Direction; // Direction UINT64 NextKeepAliveTime; // Next time to send a KeepAlive packet RC4_KEY_PAIR Rc4KeyPair; // RC4 key pair CRYPT *SendKey; // Transmission key CRYPT *RecvKey; // Reception key UINT64 DisconnectTick; // Time to disconnect this connection UINT64 EstablishedTick; // Establishment time }; // TCP communication data structure struct TCP { LIST *TcpSockList; // TCP socket list }; // UDP communication data structure struct UDP { SOCK *s; // UDP socket (for transmission) IP ip; // Destination IP address UINT port; // Destination port number UINT64 NextKeepAliveTime; // Next time to send a KeepAlive packet UINT64 Seq; // Packet sequence number UINT64 RecvSeq; QUEUE *BufferQueue; // Queue of buffer to be sent }; // Data block struct BLOCK { BOOL Compressed; // Compression flag UINT Size; // Block size UINT SizeofData; // Data size UCHAR *Buf; // Buffer bool PriorityQoS; // Priority packet for VoIP / QoS function UINT Ttl; // TTL value (Used only in ICMP NAT of Virtual.c) UINT Param1; // Parameter 1 bool IsFlooding; // Is flooding packet }; // Connection structure struct CONNECTION { LOCK *lock; // Lock REF *ref; // Reference counter CEDAR *Cedar; // Cedar struct SESSION *Session; // Session UINT Protocol; // Protocol SOCK *FirstSock; // Socket for negotiation SOCK *TubeSock; // Socket for in-process communication TCP *Tcp; // TCP communication data structure UDP *Udp; // UDP communication data structure bool ServerMode; // Server mode UINT Status; // Status char *Name; // Connection name THREAD *Thread; // Thread volatile bool Halt; // Stop flag UCHAR Random[SHA1_SIZE]; // Random number for Authentication UINT ServerVer; // Server version UINT ServerBuild; // Server build number UINT ClientVer; // Client version UINT ClientBuild; // Client build number char ServerStr[MAX_SERVER_STR_LEN + 1]; // Server string char ClientStr[MAX_CLIENT_STR_LEN + 1]; // Client string UINT Err; // Error value bool ClientConnectError_NoSavePassword; // Don't save the password for the specified user name QUEUE *ReceivedBlocks; // Block queue that is received QUEUE *SendBlocks; // Block queue planned to be sent QUEUE *SendBlocks2; // Send queue (high priority) COUNTER *CurrentNumConnection; // Counter of the number of current connections LIST *ConnectingThreads; // List of connected threads LIST *ConnectingSocks; // List of the connected sockets bool flag1; // Flag 1 UCHAR *RecvBuf; // Receive buffer char ServerName[MAX_HOST_NAME_LEN + 1]; // Server name UINT ServerPort; // Port number bool RestoreServerNameAndPort; // Flag to restore the server name and port number to original bool UseTicket; // Ticket using flag UCHAR Ticket[SHA1_SIZE]; // Ticket UINT CurrentSendQueueSize; // Total size of the transmission queue X *ServerX; // Server certificate X *ClientX; // Client certificate char *CipherName; // Encryption algorithm name UINT64 ConnectedTick; // Time it is connected IP ClientIp; // Client IP address char ClientHostname[MAX_HOST_NAME_LEN + 1]; // Client host name UINT Type; // Type bool DontUseTls1; // Do not use TLS 1.0 void *hWndForUI; // Parent window bool IsInProc; // In-process char InProcPrefix[64]; // Prefix UINT AdditionalConnectionFailedCounter; // Additional connection failure counter UINT64 LastCounterResetTick; // Time the counter was reset finally bool WasSstp; // Processed the SSTP bool WasDatProxy; // DAT proxy processed UCHAR CToken_Hash[SHA1_SIZE]; // CTOKEN_HASH UINT LastTcpQueueSize; // The last queue size of TCP sockets UINT LastPacketQueueSize; // The last queue size of packets UINT LastRecvFifoTotalSize; // The last RecvFifo total size UINT LastRecvBlocksNum; // The last ReceivedBlocks num }; // Function prototypes CONNECTION *NewClientConnection(SESSION *s); CONNECTION *NewClientConnectionEx(SESSION *s, char *client_str, UINT client_ver, UINT client_build); CONNECTION *NewServerConnection(CEDAR *cedar, SOCK *s, THREAD *t); void ReleaseConnection(CONNECTION *c); void CleanupConnection(CONNECTION *c); int CompareConnection(void *p1, void *p2); void StopConnection(CONNECTION *c, bool no_wait); void ConnectionAccept(CONNECTION *c); void StartTunnelingMode(CONNECTION *c); void EndTunnelingMode(CONNECTION *c); void DisconnectTcpSockets(CONNECTION *c); void ConnectionReceive(CONNECTION *c, CANCEL *c1, CANCEL *c2); void ConnectionSend(CONNECTION *c, UINT64 now); TCPSOCK *NewTcpSock(SOCK *s); void FreeTcpSock(TCPSOCK *ts); BLOCK *NewBlock(void *data, UINT size, int compress); void FreeBlock(BLOCK *b); void StopAllAdditionalConnectThread(CONNECTION *c); UINT GenNextKeepAliveSpan(CONNECTION *c); void SendKeepAlive(CONNECTION *c, TCPSOCK *ts); void DisconnectUDPSockets(CONNECTION *c); void PutUDPPacketData(CONNECTION *c, void *data, UINT size); void SendDataWithUDP(SOCK *s, CONNECTION *c); void InsertReveicedBlockToQueue(CONNECTION *c, BLOCK *block, bool no_lock); void InitTcpSockRc4Key(TCPSOCK *ts, bool server_mode); UINT TcpSockRecv(SESSION *s, TCPSOCK *ts, void *data, UINT size); UINT TcpSockSend(SESSION *s, TCPSOCK *ts, void *data, UINT size); void WriteSendFifo(SESSION *s, TCPSOCK *ts, void *data, UINT size); void WriteRecvFifo(SESSION *s, TCPSOCK *ts, void *data, UINT size); CLIENT_AUTH *CopyClientAuth(CLIENT_AUTH *a); BUF *NewKeepPacket(bool server_mode); void KeepThread(THREAD *thread, void *param); KEEP *StartKeep(); void StopKeep(KEEP *k); void InRpcSecureSign(SECURE_SIGN *t, PACK *p); void OutRpcSecureSign(PACK *p, SECURE_SIGN *t); void FreeRpcSecureSign(SECURE_SIGN *t); void NormalizeEthMtu(BRIDGE *b, CONNECTION *c, UINT packet_size); UINT GetMachineRand(); #endif // CONNECTION_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/