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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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2
src/Cedar/Server.h
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@ -253,6 +253,8 @@ struct OPENVPN_SSTP_CONFIG
{
bool EnableOpenVPN; // OpenVPN is enabled
char OpenVPNPortList[MAX_SIZE]; // OpenVPN UDP port number list
bool OpenVPNObfuscation; // OpenVPN: Obfuscation mode
char OpenVPNObfuscationMask[MAX_SIZE]; // OpenVPN: String (mask) for XOR obfuscation
bool EnableSSTP; // SSTP is enabled
};