686 lines
19 KiB
C
686 lines
19 KiB
C
// SoftEther VPN Source Code - Stable Edition Repository
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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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// AzureClient.c
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// VPN Azure Client
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#include "CedarPch.h"
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// Wait for connection request
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void AcWaitForRequest(AZURE_CLIENT *ac, SOCK *s, AZURE_PARAM *param)
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{
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// Validate arguments
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if (ac == NULL || s == NULL || param == NULL)
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{
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return;
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}
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while (ac->Halt == false)
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{
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UCHAR uc;
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// Receive 1 byte
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if (RecvAll(s, &uc, 1, false) == 0)
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{
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break;
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}
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if (uc != 0)
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{
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// Receive a Pack
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PACK *p = RecvPackWithHash(s);
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if (p == NULL)
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{
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break;
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}
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else
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{
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// Verify contents of Pack
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char opcode[MAX_SIZE];
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char cipher_name[MAX_SIZE];
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char hostname[MAX_SIZE];
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PackGetStr(p, "opcode", opcode, sizeof(opcode));
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PackGetStr(p, "cipher_name", cipher_name, sizeof(cipher_name));
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PackGetStr(p, "hostname", hostname, sizeof(hostname));
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if (StrCmpi(opcode, "relay") == 0)
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{
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IP client_ip, server_ip;
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UINT client_port;
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UINT server_port;
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UCHAR session_id[SHA1_SIZE];
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if (PackGetIp(p, "client_ip", &client_ip) &&
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PackGetIp(p, "server_ip", &server_ip) &&
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PackGetData2(p, "session_id", session_id, sizeof(session_id)))
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{
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client_port = PackGetInt(p, "client_port");
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server_port = PackGetInt(p, "server_port");
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if (client_port != 0 && server_port != 0)
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{
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SOCK *ns;
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Debug("Connect Request from %r:%u\n", &client_ip, client_port);
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// Create new socket and connect VPN Azure Server
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if (ac->DDnsStatusCopy.InternetSetting.ProxyType == PROXY_DIRECT)
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{
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ns = ConnectEx2(ac->DDnsStatusCopy.CurrentAzureIp, AZURE_SERVER_PORT,
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0, (bool *)&ac->Halt);
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}
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else
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{
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ns = WpcSockConnect2(ac->DDnsStatusCopy.CurrentAzureIp, AZURE_SERVER_PORT,
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&ac->DDnsStatusCopy.InternetSetting, NULL, AZURE_VIA_PROXY_TIMEOUT);
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}
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if (ns == NULL)
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{
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Debug("Connect Error.\n");
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}
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else
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{
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Debug("Connected to the relay server.\n");
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SetTimeout(ns, param->DataTimeout);
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if (StartSSLEx(ns, NULL, NULL, true, 0, NULL))
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{
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// Check certification
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char server_cert_hash_str[MAX_SIZE];
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UCHAR server_cert_hash[SHA1_SIZE];
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Zero(server_cert_hash, sizeof(server_cert_hash));
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GetXDigest(ns->RemoteX, server_cert_hash, true);
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BinToStr(server_cert_hash_str, sizeof(server_cert_hash_str),
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server_cert_hash, SHA1_SIZE);
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if (IsEmptyStr(ac->DDnsStatusCopy.AzureCertHash) || StrCmpi(server_cert_hash_str, ac->DDnsStatusCopy.AzureCertHash) == 0
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|| StrCmpi(server_cert_hash_str, ac->DDnsStatus.AzureCertHash) == 0)
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{
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if (SendAll(ns, AZURE_PROTOCOL_DATA_SIANGTURE, 24, true))
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{
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PACK *p2 = NewPack();
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PackAddStr(p2, "hostname", hostname);
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PackAddData(p2, "session_id", session_id, sizeof(session_id));
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if (SendPackWithHash(ns, p2))
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{
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UCHAR uc;
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if (RecvAll(ns, &uc, 1, true) != false)
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{
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if (uc != 0)
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{
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SOCK *accept_sock = GetReverseListeningSock(ac->Cedar);
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if (accept_sock != NULL)
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{
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AddRef(ns->ref);
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SetTimeout(ns, INFINITE);
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Copy(&ns->Reverse_MyServerGlobalIp, &server_ip, sizeof(IP));
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ns->Reverse_MyServerPort = server_port;
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InjectNewReverseSocketToAccept(accept_sock, ns,
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&client_ip, client_port);
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ReleaseSock(accept_sock);
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}
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}
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}
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}
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FreePack(p2);
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}
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}
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}
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ReleaseSock(ns);
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}
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}
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}
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}
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FreePack(p);
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}
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}
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// Send 1 byte
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uc = 0;
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if (SendAll(s, &uc, 1, false) == 0)
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{
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break;
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}
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}
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}
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// VPN Azure client main thread
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void AcMainThread(THREAD *thread, void *param)
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{
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AZURE_CLIENT *ac = (AZURE_CLIENT *)param;
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UINT last_ip_revision = INFINITE;
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UINT64 last_reconnect_tick = 0;
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UINT64 next_reconnect_interval = AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
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UINT num_reconnect_retry = 0;
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UINT64 next_ddns_retry_tick = 0;
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bool last_connect_ok = false;
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// Validate arguments
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if (ac == NULL || thread == NULL)
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{
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return;
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}
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while (ac->Halt == false)
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{
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UINT64 now = Tick64();
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bool connect_was_ok = false;
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// Wait for enabling VPN Azure function
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if (ac->IsEnabled)
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{
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// VPN Azure is enabled
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DDNS_CLIENT_STATUS st;
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bool connect_now = false;
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bool azure_ip_changed = false;
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Lock(ac->Lock);
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{
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Copy(&st, &ac->DDnsStatus, sizeof(DDNS_CLIENT_STATUS));
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if (StrCmpi(st.CurrentAzureIp, ac->DDnsStatusCopy.CurrentAzureIp) != 0)
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{
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if (IsEmptyStr(st.CurrentAzureIp) == false)
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{
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// Destination IP address is changed
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connect_now = true;
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num_reconnect_retry = 0;
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}
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}
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if (StrCmpi(st.CurrentHostName, ac->DDnsStatusCopy.CurrentHostName) != 0)
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{
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// DDNS host name is changed
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connect_now = true;
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num_reconnect_retry = 0;
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}
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Copy(&ac->DDnsStatusCopy, &st, sizeof(DDNS_CLIENT_STATUS));
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}
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Unlock(ac->Lock);
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if (last_ip_revision != ac->IpStatusRevision)
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{
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last_ip_revision = ac->IpStatusRevision;
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connect_now = true;
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num_reconnect_retry = 0;
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}
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if (last_reconnect_tick == 0 || (now >= (last_reconnect_tick + next_reconnect_interval)))
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{
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UINT r;
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last_reconnect_tick = now;
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num_reconnect_retry++;
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next_reconnect_interval = (UINT64)num_reconnect_retry * AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
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next_reconnect_interval = MIN(next_reconnect_interval, AZURE_CONNECT_MAX_RETRY_INTERVAL);
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r = (UINT)next_reconnect_interval;
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r = GenRandInterval(r / 2, r);
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next_reconnect_interval = r;
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connect_now = true;
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}
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if (IsEmptyStr(st.CurrentAzureIp) == false && IsEmptyStr(st.CurrentHostName) == false)
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{
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if (connect_now)
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{
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SOCK *s;
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char *host = NULL;
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UINT port = AZURE_SERVER_PORT;
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Debug("VPN Azure: Connecting to %s...\n", st.CurrentAzureIp);
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if (ParseHostPort(st.CurrentAzureIp, &host, &port, AZURE_SERVER_PORT))
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{
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if (st.InternetSetting.ProxyType == PROXY_DIRECT)
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{
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s = ConnectEx2(host, port, 0, (bool *)&ac->Halt);
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}
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else
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{
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s = WpcSockConnect2(host, port, &st.InternetSetting, NULL, AZURE_VIA_PROXY_TIMEOUT);
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}
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if (s != NULL)
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{
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PACK *p;
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UINT64 established_tick = 0;
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Debug("VPN Azure: Connected.\n");
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SetTimeout(s, AZURE_PROTOCOL_CONTROL_TIMEOUT_DEFAULT);
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Lock(ac->Lock);
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{
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ac->CurrentSock = s;
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ac->IsConnected = true;
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StrCpy(ac->ConnectingAzureIp, sizeof(ac->ConnectingAzureIp), st.CurrentAzureIp);
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}
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Unlock(ac->Lock);
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SendAll(s, AZURE_PROTOCOL_CONTROL_SIGNATURE, StrLen(AZURE_PROTOCOL_CONTROL_SIGNATURE), false);
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// Receive parameter
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p = RecvPackWithHash(s);
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if (p != NULL)
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{
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UCHAR c;
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AZURE_PARAM param;
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bool hostname_changed = false;
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Zero(¶m, sizeof(param));
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param.ControlKeepAlive = PackGetInt(p, "ControlKeepAlive");
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param.ControlTimeout = PackGetInt(p, "ControlTimeout");
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param.DataTimeout = PackGetInt(p, "DataTimeout");
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param.SslTimeout = PackGetInt(p, "SslTimeout");
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FreePack(p);
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param.ControlKeepAlive = MAKESURE(param.ControlKeepAlive, 1000, AZURE_SERVER_MAX_KEEPALIVE);
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param.ControlTimeout = MAKESURE(param.ControlTimeout, 1000, AZURE_SERVER_MAX_TIMEOUT);
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param.DataTimeout = MAKESURE(param.DataTimeout, 1000, AZURE_SERVER_MAX_TIMEOUT);
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param.SslTimeout = MAKESURE(param.SslTimeout, 1000, AZURE_SERVER_MAX_TIMEOUT);
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Lock(ac->Lock);
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{
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Copy(&ac->AzureParam, ¶m, sizeof(AZURE_PARAM));
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}
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Unlock(ac->Lock);
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SetTimeout(s, param.ControlTimeout);
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// Send parameter
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p = NewPack();
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PackAddStr(p, "CurrentHostName", st.CurrentHostName);
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PackAddStr(p, "CurrentAzureIp", st.CurrentAzureIp);
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PackAddInt64(p, "CurrentAzureTimestamp", st.CurrentAzureTimestamp);
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PackAddStr(p, "CurrentAzureSignature", st.CurrentAzureSignature);
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Lock(ac->Lock);
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{
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if (StrCmpi(st.CurrentHostName, ac->DDnsStatus.CurrentHostName) != 0)
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{
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hostname_changed = true;
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}
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}
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Unlock(ac->Lock);
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if (hostname_changed == false)
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{
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if (SendPackWithHash(s, p))
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{
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// Receive result
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if (RecvAll(s, &c, 1, false))
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{
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if (c && ac->Halt == false)
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{
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connect_was_ok = true;
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established_tick = Tick64();
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AcWaitForRequest(ac, s, ¶m);
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}
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}
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}
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}
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FreePack(p);
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}
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else
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{
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WHERE;
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}
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Debug("VPN Azure: Disconnected.\n");
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Lock(ac->Lock);
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{
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ac->IsConnected = false;
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ac->CurrentSock = NULL;
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ClearStr(ac->ConnectingAzureIp, sizeof(ac->ConnectingAzureIp));
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}
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Unlock(ac->Lock);
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if (established_tick != 0)
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{
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if ((established_tick + (UINT64)AZURE_CONNECT_MAX_RETRY_INTERVAL) <= Tick64())
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{
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// If the connected time exceeds the AZURE_CONNECT_MAX_RETRY_INTERVAL, reset the retry counter.
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last_reconnect_tick = 0;
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num_reconnect_retry = 0;
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next_reconnect_interval = AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
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}
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}
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Disconnect(s);
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ReleaseSock(s);
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}
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else
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{
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Debug("VPN Azure: Error: Connect Failed.\n");
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}
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Free(host);
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}
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}
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}
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}
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else
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{
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last_reconnect_tick = 0;
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num_reconnect_retry = 0;
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next_reconnect_interval = AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
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}
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if (ac->Halt)
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{
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break;
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}
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if (connect_was_ok)
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{
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// If connection goes out after connected, increment connection success count to urge DDNS client query
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next_ddns_retry_tick = Tick64() + MIN((UINT64)DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF * (UINT64)(num_reconnect_retry + 1), (UINT64)DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF_MAX);
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}
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if ((next_ddns_retry_tick != 0) && (Tick64() >= next_ddns_retry_tick))
|
|
{
|
|
next_ddns_retry_tick = 0;
|
|
|
|
ac->DDnsTriggerInt++;
|
|
}
|
|
|
|
Wait(ac->Event, rand() % 1000);
|
|
}
|
|
}
|
|
|
|
// Get enabled or disabled VPN Azure client
|
|
bool AcGetEnable(AZURE_CLIENT *ac)
|
|
{
|
|
// Validate arguments
|
|
if (ac == NULL)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
return ac->IsEnabled;
|
|
}
|
|
|
|
// Enable or disable VPN Azure client
|
|
void AcSetEnable(AZURE_CLIENT *ac, bool enabled)
|
|
{
|
|
bool old_status;
|
|
// Validate arguments
|
|
if (ac == NULL)
|
|
{
|
|
return;
|
|
}
|
|
|
|
old_status = ac->IsEnabled;
|
|
|
|
ac->IsEnabled = enabled;
|
|
|
|
if (ac->IsEnabled && (ac->IsEnabled != old_status))
|
|
{
|
|
ac->DDnsTriggerInt++;
|
|
}
|
|
|
|
AcApplyCurrentConfig(ac, NULL);
|
|
}
|
|
|
|
// Set current configuration to VPN Azure client
|
|
void AcApplyCurrentConfig(AZURE_CLIENT *ac, DDNS_CLIENT_STATUS *ddns_status)
|
|
{
|
|
bool disconnect_now = false;
|
|
SOCK *disconnect_sock = NULL;
|
|
// Validate arguments
|
|
if (ac == NULL)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// Get current DDNS configuration
|
|
Lock(ac->Lock);
|
|
{
|
|
if (ddns_status != NULL)
|
|
{
|
|
if (StrCmpi(ac->DDnsStatus.CurrentHostName, ddns_status->CurrentHostName) != 0)
|
|
{
|
|
// If host name is changed, disconnect current data connection
|
|
disconnect_now = true;
|
|
}
|
|
|
|
if (Cmp(&ac->DDnsStatus.InternetSetting, &ddns_status->InternetSetting, sizeof(INTERNET_SETTING)) != 0)
|
|
{
|
|
// If proxy setting is changed, disconnect current data connection
|
|
disconnect_now = true;
|
|
}
|
|
|
|
Copy(&ac->DDnsStatus, ddns_status, sizeof(DDNS_CLIENT_STATUS));
|
|
}
|
|
|
|
if (ac->IsEnabled == false)
|
|
{
|
|
// If VPN Azure client is disabled, disconnect current data connection
|
|
disconnect_now = true;
|
|
}
|
|
|
|
if (disconnect_now)
|
|
{
|
|
if (ac->CurrentSock != NULL)
|
|
{
|
|
disconnect_sock = ac->CurrentSock;
|
|
AddRef(disconnect_sock->ref);
|
|
}
|
|
}
|
|
}
|
|
Unlock(ac->Lock);
|
|
|
|
if (disconnect_sock != NULL)
|
|
{
|
|
Disconnect(disconnect_sock);
|
|
ReleaseSock(disconnect_sock);
|
|
}
|
|
|
|
Set(ac->Event);
|
|
}
|
|
|
|
// Free VPN Azure client
|
|
void FreeAzureClient(AZURE_CLIENT *ac)
|
|
{
|
|
SOCK *disconnect_sock = NULL;
|
|
// Validate arguments
|
|
if (ac == NULL)
|
|
{
|
|
return;
|
|
}
|
|
|
|
ac->Halt = true;
|
|
|
|
Lock(ac->Lock);
|
|
{
|
|
if (ac->CurrentSock != NULL)
|
|
{
|
|
disconnect_sock = ac->CurrentSock;
|
|
|
|
AddRef(disconnect_sock->ref);
|
|
}
|
|
}
|
|
Unlock(ac->Lock);
|
|
|
|
if (disconnect_sock != NULL)
|
|
{
|
|
Disconnect(disconnect_sock);
|
|
ReleaseSock(disconnect_sock);
|
|
}
|
|
|
|
Set(ac->Event);
|
|
|
|
// Stop main thread
|
|
WaitThread(ac->MainThread, INFINITE);
|
|
ReleaseThread(ac->MainThread);
|
|
|
|
ReleaseEvent(ac->Event);
|
|
|
|
DeleteLock(ac->Lock);
|
|
|
|
Free(ac);
|
|
}
|
|
|
|
// Create new VPN Azure client
|
|
AZURE_CLIENT *NewAzureClient(CEDAR *cedar, SERVER *server)
|
|
{
|
|
AZURE_CLIENT *ac;
|
|
// Validate arguments
|
|
if (cedar == NULL || server == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
ac = ZeroMalloc(sizeof(AZURE_CLIENT));
|
|
|
|
ac->Cedar = cedar;
|
|
|
|
ac->Server = server;
|
|
|
|
ac->Lock = NewLock();
|
|
|
|
ac->IsEnabled = false;
|
|
|
|
ac->Event = NewEvent();
|
|
|
|
// Start main thread
|
|
ac->MainThread = NewThread(AcMainThread, ac);
|
|
|
|
return ac;
|
|
}
|
|
|