246 lines
10 KiB
Swift
246 lines
10 KiB
Swift
//
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// Copyright © 2018 WireGuard LLC. All rights reserved.
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//
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import NetworkExtension
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import os.log
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enum PacketTunnelProviderError: Error {
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case tunnelSetupFailed
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}
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/// A packet tunnel provider object.
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class PacketTunnelProvider: NEPacketTunnelProvider {
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// MARK: Properties
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private var wgHandle: Int32?
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private var wgContext: WireGuardContext?
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private var config: NETunnelProviderProtocol {
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return self.protocolConfiguration as! NETunnelProviderProtocol // swiftlint:disable:this force_cast
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}
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private var interfaceName: String {
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return config.providerConfiguration![PCKeys.title.rawValue]! as! String // swiftlint:disable:this force_cast
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}
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private var settings: String {
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return config.providerConfiguration![PCKeys.settings.rawValue]! as! String // swiftlint:disable:this force_cast
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}
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// MARK: NEPacketTunnelProvider
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/// Begin the process of establishing the tunnel.
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override func startTunnel(options: [String: NSObject]?, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
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os_log("Starting tunnel", log: Log.general, type: .info)
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let validatedEndpoints = (config.providerConfiguration?[PCKeys.endpoints.rawValue] as? String ?? "").commaSeparatedToArray().compactMap { try? Endpoint(endpointString: String($0)) }.compactMap {$0}
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let validatedAddresses = (config.providerConfiguration?[PCKeys.addresses.rawValue] as? String ?? "").commaSeparatedToArray().compactMap { try? CIDRAddress(stringRepresentation: String($0)) }.compactMap { $0 }
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guard let firstEndpoint = validatedEndpoints.first else {
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startTunnelCompletionHandler(PacketTunnelProviderError.tunnelSetupFailed)
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return
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}
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configureLogger()
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wgContext = WireGuardContext(packetFlow: self.packetFlow)
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let handle = connect(interfaceName: interfaceName, settings: settings)
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if handle < 0 {
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startTunnelCompletionHandler(PacketTunnelProviderError.tunnelSetupFailed)
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return
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}
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wgHandle = handle
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// We use the first endpoint for the ipAddress
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let newSettings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: firstEndpoint.ipAddress)
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newSettings.tunnelOverheadBytes = 80
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// IPv4 settings
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let validatedIPv4Addresses = validatedAddresses.filter { $0.addressType == .IPv4}
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if validatedIPv4Addresses.count > 0 {
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let ipv4Settings = NEIPv4Settings(addresses: validatedIPv4Addresses.map { $0.ipAddress }, subnetMasks: validatedIPv4Addresses.map { $0.subnetString })
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ipv4Settings.includedRoutes = [NEIPv4Route.default()]
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ipv4Settings.excludedRoutes = validatedEndpoints.filter { $0.addressType == .IPv4}.map {
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NEIPv4Route(destinationAddress: $0.ipAddress, subnetMask: "255.255.255.255")}
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newSettings.ipv4Settings = ipv4Settings
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}
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// IPv6 settings
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let validatedIPv6Addresses = validatedAddresses.filter { $0.addressType == .IPv6}
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if validatedIPv6Addresses.count > 0 {
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let ipv6Settings = NEIPv6Settings(addresses: validatedIPv6Addresses.map { $0.ipAddress }, networkPrefixLengths: validatedIPv6Addresses.map { NSNumber(value: $0.subnet) })
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ipv6Settings.includedRoutes = [NEIPv6Route.default()]
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ipv6Settings.excludedRoutes = validatedEndpoints.filter { $0.addressType == .IPv6}.map { NEIPv6Route(destinationAddress: $0.ipAddress, networkPrefixLength: 128)}
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newSettings.ipv6Settings = ipv6Settings
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}
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if let dns = config.providerConfiguration?[PCKeys.dns.rawValue] as? String {
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newSettings.dnsSettings = NEDNSSettings(servers: dns.commaSeparatedToArray())
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}
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if let mtu = config.providerConfiguration![PCKeys.mtu.rawValue] as? NSNumber, mtu.intValue > 0 {
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newSettings.mtu = mtu
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}
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setTunnelNetworkSettings(newSettings) { (error) in
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if let error = error {
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os_log("Error setting network settings: %s", log: Log.general, type: .error, error.localizedDescription)
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startTunnelCompletionHandler(PacketTunnelProviderError.tunnelSetupFailed)
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} else {
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startTunnelCompletionHandler(nil /* No errors */)
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}
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}
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}
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/// Begin the process of stopping the tunnel.
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override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
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os_log("Stopping tunnel", log: Log.general, type: .info)
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if let handle = wgHandle {
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wgTurnOff(handle)
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}
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wgContext?.closeTunnel()
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completionHandler()
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}
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/// Handle IPC messages from the app.
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override func handleAppMessage(_ messageData: Data, completionHandler: ((Data?) -> Void)?) {
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let responseData: Data?
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switch ExtensionMessage(messageData) {
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case ExtensionMessage.requestVersion:
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responseData = (wgVersion().flatMap { String(cString: $0) } ?? "").data(using: .utf8)
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default:
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responseData = nil
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}
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completionHandler?(responseData)
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}
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private func configureLogger() {
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wgSetLogger { (level, tagCStr, msgCStr) in
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let logType: OSLogType
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switch level {
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case 0:
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logType = .debug
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case 1:
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logType = .info
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case 2:
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logType = .error
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default:
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logType = .default
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}
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let tag = (tagCStr != nil) ? String(cString: tagCStr!) : ""
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let msg = (msgCStr != nil) ? String(cString: msgCStr!) : ""
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os_log("wg log: %{public}s: %{public}s", log: Log.general, type: logType, tag, msg)
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}
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}
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private func connect(interfaceName: String, settings: String) -> Int32 { // swiftlint:disable:this cyclomatic_complexity
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return withStringsAsGoStrings(interfaceName, settings) { (nameGoStr, settingsGoStr) -> Int32 in
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return withUnsafeMutablePointer(to: &wgContext) { (wgCtxPtr) -> Int32 in
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return wgTurnOn(nameGoStr, settingsGoStr, { (wgCtxPtr, buf, len) -> Int in
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autoreleasepool {
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// read_fn: Read from the TUN interface and pass it on to WireGuard
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guard let wgCtxPtr = wgCtxPtr else { return 0 }
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guard let buf = buf else { return 0 }
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let wgContext = wgCtxPtr.bindMemory(to: WireGuardContext.self, capacity: 1).pointee
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var isTunnelClosed = false
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guard let packet = wgContext.readPacket(isTunnelClosed: &isTunnelClosed) else { return 0 }
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if isTunnelClosed { return -1 }
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let packetData = packet.data
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if packetData.count <= len {
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packetData.copyBytes(to: buf, count: packetData.count)
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return packetData.count
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}
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return 0
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}
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}, { (wgCtxPtr, buf, len) -> Int in
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autoreleasepool {
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// write_fn: Receive packets from WireGuard and write to the TUN interface
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guard let wgCtxPtr = wgCtxPtr else { return 0 }
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guard let buf = buf else { return 0 }
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guard len > 0 else { return 0 }
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let wgContext = wgCtxPtr.bindMemory(to: WireGuardContext.self, capacity: 1).pointee
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let ipVersionBits = (buf[0] & 0xf0) >> 4
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let ipVersion: sa_family_t? = {
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if ipVersionBits == 4 { return sa_family_t(AF_INET) } // IPv4
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if ipVersionBits == 6 { return sa_family_t(AF_INET6) } // IPv6
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return nil
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}()
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guard let protocolFamily = ipVersion else { fatalError("Unknown IP version") }
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let packet = NEPacket(data: Data(bytes: buf, count: len), protocolFamily: protocolFamily)
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var isTunnelClosed = false
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let isWritten = wgContext.writePacket(packet: packet, isTunnelClosed: &isTunnelClosed)
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if isTunnelClosed { return -1 }
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if isWritten {
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return len
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}
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return 0
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}
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},
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wgCtxPtr)
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}
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}
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}
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}
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class WireGuardContext {
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private var packetFlow: NEPacketTunnelFlow
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private var outboundPackets: [NEPacket] = []
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private var isTunnelClosed: Bool = false
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private var readPacketCondition = NSCondition()
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init(packetFlow: NEPacketTunnelFlow) {
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self.packetFlow = packetFlow
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}
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func closeTunnel() {
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isTunnelClosed = true
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readPacketCondition.signal()
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}
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func packetsRead(packets: [NEPacket]) {
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readPacketCondition.lock()
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outboundPackets.append(contentsOf: packets)
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readPacketCondition.unlock()
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readPacketCondition.signal()
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}
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func readPacket(isTunnelClosed: inout Bool) -> NEPacket? {
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if outboundPackets.isEmpty {
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readPacketCondition.lock()
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packetFlow.readPacketObjects(completionHandler: packetsRead)
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while outboundPackets.isEmpty && !self.isTunnelClosed {
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readPacketCondition.wait()
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}
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readPacketCondition.unlock()
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}
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isTunnelClosed = self.isTunnelClosed
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if !outboundPackets.isEmpty {
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return outboundPackets.removeFirst()
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}
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return nil
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}
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func writePacket(packet: NEPacket, isTunnelClosed: inout Bool) -> Bool {
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isTunnelClosed = self.isTunnelClosed
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return packetFlow.writePacketObjects([packet])
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}
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}
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private func withStringsAsGoStrings<R>(_ str1: String, _ str2: String, closure: (gostring_t, gostring_t) -> R) -> R {
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return str1.withCString { (s1cStr) -> R in
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let gstr1 = gostring_t(p: s1cStr, n: str1.utf8.count)
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return str2.withCString { (s2cStr) -> R in
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let gstr2 = gostring_t(p: s2cStr, n: str2.utf8.count)
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return closure(gstr1, gstr2)
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}
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}
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}
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