I am trying to implement Transparent Proxy using NETransparentProxy on macOS 10.15 to see the flows but not able to do that
Extension code:
class AppProxyProvider: NEAppProxyProvider {
override func startProxy(options: [String : Any]? = nil, completionHandler: @escaping (Error?) -> Void) {
os_log("startProxy function called.")
let includeRule = NENetworkRule(destinationHost: NWHostEndpoint(hostname: "google.com", port: "443"), protocol: .TCP)
let proxySettings = NETransparentProxyNetworkSettings(tunnelRemoteAddress: "127.0.0.1")
proxySettings.includedNetworkRules = [includeRule]
setTunnelNetworkSettings(proxySettings) { error in
if let applyError = error {
os_log("Failed to apply proxy settings: %@", applyError.localizedDescription)
}
completionHandler(error)
}
}
override func stopProxy(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
completionHandler()
}
override func handleNewFlow(_ flow: NEAppProxyFlow) -> Bool {
if let tcpflow = flow as? NEAppProxyTCPFlow {
os_log("Got TCP flow for site. %@", tcpflow.metaData.debugDescription)
} else {
os_log("Got something else. %@", flow.metaData.debugDescription)
}
return false
}
}
App code:
func enableProxyConfiguration() {
let manager = NETunnelProviderManager.shared()
guard !manager.isEnabled else {
registerWithProvider()
return
}
loadProxyConfiguration { success in
guard success else {
self.status = .stopped
return
}
if manager.protocolConfiguration == nil {
manager.protocolConfiguration = NETunnelProviderProtocol()
manager.protocolConfiguration?.serverAddress = "127.0.0.1"
if let appName = Bundle.main.infoDictionary?["CFBundleName"] as? String {
manager.localizedDescription = appName
}
}
manager.isEnabled = true
manager.saveToPreferences { saveError in
DispatchQueue.main.async {
if let error = saveError {
os_log("Failed to save the configuration: %@", error.localizedDescription)
self.status = .stopped
return
}
self.registerWithProvider()
}
}
}
}
I am getting following message when starting the app:
default 13:04:21.099931+0530 TransparentProxy Failed to save the configuration: Missing protocol or protocol has invalid type
Also not getting any flows and no logs even for startProxy.
In app I have tried both
let manager = NETunnelProviderManager.shared()
and
let manager = NETransparentProxyManager.shared()
but nothing is working.
I have trying searching the issue in forum but couldn't find anything to resolve it.
Please help on how to resolve this issue.
