299 lines
11 KiB
Swift
299 lines
11 KiB
Swift
//
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// NetworkSettingsBuilder.swift
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// TunnelKit
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//
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// Created by Davide De Rosa on 10/21/22.
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// Copyright (c) 2022 Davide De Rosa. All rights reserved.
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//
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// https://github.com/passepartoutvpn
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//
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// This file is part of TunnelKit.
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//
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// TunnelKit is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// TunnelKit 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
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// along with TunnelKit. If not, see <http://www.gnu.org/licenses/>.
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//
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import Foundation
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import NetworkExtension
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import TunnelKitCore
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import TunnelKitOpenVPNCore
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import SwiftyBeaver
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private let log = SwiftyBeaver.self
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struct NetworkSettingsBuilder {
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let remoteAddress: String
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let localOptions: OpenVPN.Configuration
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let remoteOptions: OpenVPN.Configuration
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init(remoteAddress: String, localOptions: OpenVPN.Configuration, remoteOptions: OpenVPN.Configuration) {
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self.remoteAddress = remoteAddress
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self.localOptions = localOptions
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self.remoteOptions = remoteOptions
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}
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func build() -> NEPacketTunnelNetworkSettings {
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let ipv4Settings = computedIPv4Settings
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let ipv6Settings = computedIPv6Settings
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let dnsSettings = computedDNSSettings
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let proxySettings = computedProxySettings
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// add direct routes to DNS servers
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if !isGateway {
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for server in dnsSettings?.servers ?? [] {
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if server.contains(":") {
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ipv6Settings?.includedRoutes?.insert(NEIPv6Route(destinationAddress: server, networkPrefixLength: 128), at: 0)
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} else {
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ipv4Settings?.includedRoutes?.insert(NEIPv4Route(destinationAddress: server, subnetMask: "255.255.255.255"), at: 0)
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}
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}
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}
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let settings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: remoteAddress)
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settings.ipv4Settings = ipv4Settings
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settings.ipv6Settings = ipv6Settings
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settings.dnsSettings = dnsSettings
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settings.proxySettings = proxySettings
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if let mtu = localOptions.mtu, mtu > 0 {
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settings.mtu = NSNumber(value: mtu)
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}
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return settings
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}
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}
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extension NetworkSettingsBuilder {
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private var pullRoutes: Bool {
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!(localOptions.noPullMask?.contains(.routes) ?? false)
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}
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private var pullDNS: Bool {
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!(localOptions.noPullMask?.contains(.dns) ?? false)
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}
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private var pullProxy: Bool {
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!(localOptions.noPullMask?.contains(.proxy) ?? false)
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}
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}
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extension NetworkSettingsBuilder {
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var isGateway: Bool {
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isIPv4Gateway || isIPv6Gateway
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}
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private var routingPolicies: [OpenVPN.RoutingPolicy]? {
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pullRoutes ? (remoteOptions.routingPolicies ?? localOptions.routingPolicies) : localOptions.routingPolicies
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}
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private var isIPv4Gateway: Bool {
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routingPolicies?.contains(.IPv4) ?? false
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}
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private var isIPv6Gateway: Bool {
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routingPolicies?.contains(.IPv6) ?? false
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}
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}
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extension NetworkSettingsBuilder {
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// IPv4/6 address/mask MUST come from server options
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// routes, instead, can both come from server and local options
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//
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// FIXME: routes from local options are ignored (#278)
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private var computedIPv4Settings: NEIPv4Settings? {
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guard let ipv4 = remoteOptions.ipv4 else {
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return nil
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}
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let ipv4Settings = NEIPv4Settings(addresses: [ipv4.address], subnetMasks: [ipv4.addressMask])
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var routes: [NEIPv4Route] = []
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// route all traffic to VPN?
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if isIPv4Gateway {
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let defaultRoute = NEIPv4Route.default()
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defaultRoute.gatewayAddress = ipv4.defaultGateway
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routes.append(defaultRoute)
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log.info("Routing.IPv4: Setting default gateway to \(ipv4.defaultGateway)")
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}
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// FIXME: this is ineffective until #278 is fixed (localOptions.ipv4 is always nil)
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let computedRoutes = (pullRoutes ? (remoteOptions.ipv4?.routes ?? localOptions.ipv4?.routes) : localOptions.ipv4?.routes) ?? []
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for r in computedRoutes {
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let ipv4Route = NEIPv4Route(destinationAddress: r.destination, subnetMask: r.mask)
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ipv4Route.gatewayAddress = r.gateway
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routes.append(ipv4Route)
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log.info("Routing.IPv4: Adding route \(r.destination)/\(r.mask) -> \(r.gateway)")
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}
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ipv4Settings.includedRoutes = routes
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ipv4Settings.excludedRoutes = []
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return ipv4Settings
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}
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private var computedIPv6Settings: NEIPv6Settings? {
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guard let ipv6 = remoteOptions.ipv6 else {
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return nil
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}
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let ipv6Settings = NEIPv6Settings(addresses: [ipv6.address], networkPrefixLengths: [ipv6.addressPrefixLength as NSNumber])
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var routes: [NEIPv6Route] = []
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// route all traffic to VPN?
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if isIPv6Gateway {
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let defaultRoute = NEIPv6Route.default()
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defaultRoute.gatewayAddress = ipv6.defaultGateway
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routes.append(defaultRoute)
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log.info("Routing.IPv6: Setting default gateway to \(ipv6.defaultGateway)")
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}
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// FIXME: this is ineffective until #278 is fixed (localOptions.ipv6 is always nil)
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let computedRoutes = (pullRoutes ? (remoteOptions.ipv6?.routes ?? localOptions.ipv6?.routes) : localOptions.ipv6?.routes) ?? []
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for r in computedRoutes {
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let ipv6Route = NEIPv6Route(destinationAddress: r.destination, networkPrefixLength: r.prefixLength as NSNumber)
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ipv6Route.gatewayAddress = r.gateway
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routes.append(ipv6Route)
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log.info("Routing.IPv6: Adding route \(r.destination)/\(r.prefixLength) -> \(r.gateway)")
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}
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ipv6Settings.includedRoutes = routes
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ipv6Settings.excludedRoutes = []
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return ipv6Settings
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}
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var hasGateway: Bool {
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var hasGateway = false
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if isIPv4Gateway && remoteOptions.ipv4 != nil {
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hasGateway = true
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}
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if isIPv6Gateway && remoteOptions.ipv6 != nil {
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hasGateway = true
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}
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return hasGateway
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}
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}
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extension NetworkSettingsBuilder {
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private var computedDNSSettings: NEDNSSettings? {
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guard localOptions.isDNSEnabled ?? true else {
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return nil
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}
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var dnsSettings: NEDNSSettings?
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var dnsServers: [String] = []
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if #available(iOS 14, macOS 11, *) {
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switch localOptions.dnsProtocol {
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case .https:
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dnsServers = localOptions.dnsServers ?? []
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guard let serverURL = localOptions.dnsHTTPSURL else {
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break
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}
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let specific = NEDNSOverHTTPSSettings(servers: dnsServers)
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specific.serverURL = serverURL
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dnsSettings = specific
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log.info("DNS over HTTPS: Using servers \(dnsServers)")
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log.info("\tHTTPS URL: \(serverURL)")
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case .tls:
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dnsServers = localOptions.dnsServers ?? []
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guard let serverName = localOptions.dnsTLSServerName else {
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break
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}
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let specific = NEDNSOverTLSSettings(servers: dnsServers)
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specific.serverName = serverName
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dnsSettings = specific
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log.info("DNS over TLS: Using servers \(dnsServers)")
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log.info("\tTLS server name: \(serverName)")
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default:
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break
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}
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}
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// fall back
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if dnsSettings == nil {
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dnsServers = (pullDNS ? (remoteOptions.dnsServers ?? localOptions.dnsServers) : localOptions.dnsServers) ?? []
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if !dnsServers.isEmpty {
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log.info("DNS: Using servers \(dnsServers)")
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dnsSettings = NEDNSSettings(servers: dnsServers)
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} else {
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// log.warning("DNS: No servers provided, using fall-back servers: \(fallbackDNSServers)")
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// dnsSettings = NEDNSSettings(servers: fallbackDNSServers)
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if isGateway {
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log.warning("DNS: No settings provided")
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} else {
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log.warning("DNS: No settings provided, using current network settings")
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}
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}
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}
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// "hack" for split DNS (i.e. use VPN only for DNS)
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if !isGateway {
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dnsSettings?.matchDomains = [""]
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}
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if let searchDomains = pullDNS ? (remoteOptions.searchDomains ?? localOptions.searchDomains) : localOptions.searchDomains {
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log.info("DNS: Using search domains \(searchDomains)")
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dnsSettings?.domainName = searchDomains.first
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dnsSettings?.searchDomains = searchDomains
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if !isGateway {
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dnsSettings?.matchDomains = dnsSettings?.searchDomains
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}
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}
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return dnsSettings
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}
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}
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extension NetworkSettingsBuilder {
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private var computedProxySettings: NEProxySettings? {
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guard localOptions.isProxyEnabled ?? true else {
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return nil
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}
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var proxySettings: NEProxySettings?
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if let httpsProxy = pullProxy ? (remoteOptions.httpsProxy ?? localOptions.httpsProxy) : localOptions.httpsProxy {
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proxySettings = NEProxySettings()
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proxySettings?.httpsServer = httpsProxy.neProxy()
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proxySettings?.httpsEnabled = true
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log.info("Routing: Setting HTTPS proxy \(httpsProxy.address):\(httpsProxy.port)")
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}
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if let httpProxy = pullProxy ? (remoteOptions.httpProxy ?? localOptions.httpProxy) : localOptions.httpProxy {
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if proxySettings == nil {
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proxySettings = NEProxySettings()
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}
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proxySettings?.httpServer = httpProxy.neProxy()
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proxySettings?.httpEnabled = true
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log.info("Routing: Setting HTTP proxy \(httpProxy.address):\(httpProxy.port)")
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}
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if let pacURL = pullProxy ? (remoteOptions.proxyAutoConfigurationURL ?? localOptions.proxyAutoConfigurationURL) : localOptions.proxyAutoConfigurationURL {
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if proxySettings == nil {
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proxySettings = NEProxySettings()
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}
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proxySettings?.proxyAutoConfigurationURL = pacURL
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proxySettings?.autoProxyConfigurationEnabled = true
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log.info("Routing: Setting PAC \(pacURL)")
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}
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// only set if there is a proxy (proxySettings set to non-nil above)
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if let bypass = pullProxy ? (remoteOptions.proxyBypassDomains ?? localOptions.proxyBypassDomains) : localOptions.proxyBypassDomains {
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proxySettings?.exceptionList = bypass
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log.info("Routing: Setting proxy by-pass list: \(bypass)")
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}
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return proxySettings
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}
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}
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private extension Proxy {
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func neProxy() -> NEProxyServer {
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return NEProxyServer(address: address, port: Int(port))
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}
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}
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