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OpenVPN: Add packet scrambling/obfuscation feature

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This allows an OpenVPN client to bypass a firewall which is aware of the protocol and is able to block it.
The XOR mask set on the server has to be the same on the client, otherwise it will not be able to connect with certain obfuscation modes.
A special OpenVPN client built with the "XOR patch" is required in order to use this function, because it has never been merged in the official OpenVPN repository.

Two parameters are added to the server configuration: "OpenVPNObfuscationMethod" and "OpenVPNObfuscationMask".
Their value can be retrieved with "OpenVpnObfuscationGet" and set with "OpenVpnObfuscationEnable" in the VPN Command Line Management Utility.
This commit is contained in:
Davide Beatrici
2018-11-12 22:32:37 +01:00
parent 25c99a7e04
commit 6a45921f41
14 changed files with 566 additions and 123 deletions
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18
src/bin/hamcore/strtable_cn.stb
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@ -6280,6 +6280,24 @@ CMD_OpenVpnMakeConfig_OK 样本设置文件被保存为 "%s"。您可以解
CMD_OpenVpnMakeConfig_ERROR 本样本设置文件不能保存为 "%s"。该文件名无效。\n
# OpenVpnObfuscationEnable
CMD_OpenVpnObfuscationEnable Enable / Disable the OpenVPN clone server function's obfuscation mode
CMD_OpenVpnObfuscationEnable_Help This allows an OpenVPN client to bypass a firewall which is aware of the protocol and is able to block it.\nThe same XOR mask have to be applied to the client, otherwise it will not be able to connect with certain obfuscation methods!\nBeware that you need a special OpenVPN client with the "XOR patch" applied in order to use this function, because it has never been merged in the official OpenVPN repository.\n\nTo execute this command, you must have VPN Server administrator privileges. \nThis command cannot be run on VPN Bridge.\nYou cannot execute this command for Virtual Hubs of VPN Servers operating as a cluster.
CMD_OpenVpnObfuscationEnable_Args OpenVpnObfuscationEnable [yes|no] [/MASK:mask]
CMD_OpenVpnObfuscationEnable_[yes|no] Specify "yes" to enable the OpenVPN obfuscation function. Specify "no" to disable it.
CMD_OpenVpnObfuscationEnable_MASK Mask used to XOR the bytes in the packet (used for certain obfuscation modes).
CMD_OpenVpnObfuscationEnable_Prompt_[yes|no] Enable OpenVPN packet obfuscation (yes / no):
CMD_OpenVpnObfuscationEnable_Prompt_MASK XOR mask:
# OpenVpnObfuscationGet
CMD_OpenVpnObfuscationGet Get the current settings of the OpenVPN clone server function's obfuscation mode
CMD_OpenVpnObfuscationGet_Help Get and show the current settings of the OpenVPN clone server function's obfuscation mode
CMD_OpenVpnObfuscationGet_Args OpenVpnObfuscationGet
CMD_OpenVpnObfuscationGet_PRINT_Enabled OpenVPN obfuscation enabled
CMD_OpenVpnObfuscationGet_PRINT_Mask XOR mask
# SstpEnable 命令
CMD_SstpEnable 启用/禁用 Microsoft SSTP VPN 克隆服务器功能
CMD_SstpEnable_Help 本 VPN Server 拥有植入在微软 Windows Server 2008 / 2012 中的 MS-SSTP VPN Server 的克隆功能。Windows Vista / 7 / 8 / RT / 10 中的标准 MS-SSTP 用户端可以连接本 VPN Server。\n\n[注意]\n在 VPN Server 上的 SSL 证书 CN 值必须要和指定给客户端的主机名吻合。并且，该证书必须在 SSTP VPN Client 的信任列表中。详情请参见微软相关文件。\n您可以用用 ServerCertRegenerate 命令来取代当前 VPN Server 的证书，形成一个新的，有 CN 值字段的自我认证证书。这样的话，您需要在 SSTP VPN Client 注册这样一个新的自我认证证书作为一个可信任根证书。如果您的确想做这件复杂的事，请考虑购买一个商业权威机构的 SSL 证书，如 VeriSign 或者 GlobalSign。\n\n指定用户名连接到虚拟 HUB 的的方式，使用本克隆服务器功能来为默认虚拟 HUB 的选择规则都与 IPsec 服务器功能相同。详情，请参见 IPsecEnable 命令的帮助。\n\n要执行此命令，您必须具有 VPN Server 管理员权限。\n该命令在 VPN Bridge 上不能运行。\n以集群成员运行的 VPN Server 的虚拟 HUB 不能执行此命令。