569 lines
24 KiB
Swift
569 lines
24 KiB
Swift
//
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// TunnelKitProvider+Configuration.swift
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// TunnelKit
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//
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// Created by Davide De Rosa on 10/23/17.
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// Copyright (c) 2018 Davide De Rosa. All rights reserved.
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//
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// https://github.com/keeshux
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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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// This file incorporates work covered by the following copyright and
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// permission notice:
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//
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// Copyright (c) 2018-Present Private Internet Access
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//
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import Foundation
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import NetworkExtension
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import SwiftyBeaver
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private let log = SwiftyBeaver.self
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extension TunnelKitProvider {
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// MARK: Configuration
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/// A socket type between UDP (recommended) and TCP.
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public enum SocketType: String {
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/// UDP socket type.
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case udp = "UDP"
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/// TCP socket type.
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case tcp = "TCP"
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}
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/// Defines the communication protocol of an endpoint.
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public struct EndpointProtocol: Equatable, CustomStringConvertible {
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/// The socket type.
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public let socketType: SocketType
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/// The remote port.
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public let port: UInt16
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/// :nodoc:
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public init(_ socketType: SocketType, _ port: UInt16) {
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self.socketType = socketType
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self.port = port
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}
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/// :nodoc:
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public static func deserialized(_ string: String) throws -> EndpointProtocol {
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let components = string.components(separatedBy: ":")
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guard components.count == 2 else {
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throw ProviderError.configuration(field: "endpointProtocol")
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}
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guard let socketType = SocketType(rawValue: components[0]) else {
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throw ProviderError.configuration(field: "endpointProtocol.socketType")
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}
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guard let port = UInt16(components[1]) else {
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throw ProviderError.configuration(field: "endpointProtocol.port")
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}
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return EndpointProtocol(socketType, port)
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}
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/// :nodoc:
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public func serialized() -> String {
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return "\(socketType.rawValue):\(port)"
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}
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// MARK: Equatable
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/// :nodoc:
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public static func ==(lhs: EndpointProtocol, rhs: EndpointProtocol) -> Bool {
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return (lhs.socketType == rhs.socketType) && (lhs.port == rhs.port)
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}
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// MARK: CustomStringConvertible
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/// :nodoc:
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public var description: String {
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return serialized()
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}
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}
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/// Encapsulates an endpoint along with the authentication credentials.
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public struct AuthenticatedEndpoint {
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/// The remote hostname or IP address.
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public let hostname: String
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/// The username.
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public let username: String
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/// The password.
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public let password: String
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/// :nodoc:
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public init(hostname: String, username: String, password: String) {
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self.hostname = hostname
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self.username = username
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self.password = password
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}
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init(protocolConfiguration: NEVPNProtocol) throws {
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guard let hostname = protocolConfiguration.serverAddress else {
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throw ProviderError.configuration(field: "protocolConfiguration.serverAddress")
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}
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guard let username = protocolConfiguration.username else {
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throw ProviderError.credentials(field: "protocolConfiguration.username")
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}
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guard let passwordReference = protocolConfiguration.passwordReference else {
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throw ProviderError.credentials(field: "protocolConfiguration.passwordReference")
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}
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guard let password = try? Keychain.password(for: username, reference: passwordReference) else {
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throw ProviderError.credentials(field: "protocolConfiguration.passwordReference (keychain)")
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}
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self.hostname = hostname
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self.username = username
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self.password = password
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}
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}
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/// The way to create a `TunnelKitProvider.Configuration` object for the tunnel profile.
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public struct ConfigurationBuilder {
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// MARK: App group
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/// The name of a shared app group.
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public let appGroup: String
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// MARK: Tunnel parameters
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/// Prefers resolved addresses over DNS resolution. `resolvedAddresses` must be set and non-empty. Default is `false`.
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///
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/// - Seealso: `fallbackServerAddresses`
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public var prefersResolvedAddresses: Bool
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/// Resolved addresses in case DNS fails or `prefersResolvedAddresses` is `true`.
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public var resolvedAddresses: [String]?
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/// The accepted communication protocols. Must be non-empty.
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public var endpointProtocols: [EndpointProtocol]
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/// The encryption algorithm.
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public var cipher: SessionProxy.Cipher
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/// The message digest algorithm.
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public var digest: SessionProxy.Digest
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/// The optional CA certificate to validate server against. Set to `nil` to disable CA validation (default).
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public var ca: CryptoContainer?
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/// The optional client certificate to authenticate with. Set to `nil` to disable client authentication (default).
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public var clientCertificate: CryptoContainer?
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/// The optional key for `clientCertificate`. Set to `nil` if client authentication unused (default).
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public var clientKey: CryptoContainer?
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/// The MTU of the link.
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public var mtu: Int
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/// Sets compression framing, disabled by default.
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public var compressionFraming: SessionProxy.CompressionFraming
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/// The number of seconds after which a renegotiation is started. Set to `nil` to disable renegotiation (default).
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public var renegotiatesAfterSeconds: Int?
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// MARK: Debugging
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/// Enables debugging. If `true`, then `debugLogKey` is a mandatory field.
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public var shouldDebug: Bool
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/// The key in `defaults` where the latest debug log snapshot is stored. Ignored if `shouldDebug` is `false`.
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public var debugLogKey: String?
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/// Optional debug log format (SwiftyBeaver format).
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public var debugLogFormat: String?
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// MARK: Building
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/**
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Default initializer.
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- Parameter appGroup: The name of the app group in which the tunnel extension lives in.
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*/
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public init(appGroup: String) {
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self.appGroup = appGroup
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prefersResolvedAddresses = false
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resolvedAddresses = nil
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endpointProtocols = [EndpointProtocol(.udp, 1194)]
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cipher = .aes128cbc
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digest = .sha1
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ca = nil
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mtu = 1500
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compressionFraming = .disabled
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renegotiatesAfterSeconds = nil
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shouldDebug = false
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debugLogKey = nil
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debugLogFormat = nil
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}
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fileprivate init(providerConfiguration: [String: Any]) throws {
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let S = Configuration.Keys.self
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guard let appGroup = providerConfiguration[S.appGroup] as? String else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.appGroup)]")
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}
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guard let cipherAlgorithm = providerConfiguration[S.cipherAlgorithm] as? String, let cipher = SessionProxy.Cipher(rawValue: cipherAlgorithm) else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.cipherAlgorithm)]")
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}
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guard let digestAlgorithm = providerConfiguration[S.digestAlgorithm] as? String, let digest = SessionProxy.Digest(rawValue: digestAlgorithm) else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.digestAlgorithm)]")
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}
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let ca: CryptoContainer?
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let clientCertificate: CryptoContainer?
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let clientKey: CryptoContainer?
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if let pem = providerConfiguration[S.ca] as? String {
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ca = CryptoContainer(pem: pem)
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} else {
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ca = nil
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}
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if let pem = providerConfiguration[S.clientCertificate] as? String {
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guard let keyPEM = providerConfiguration[S.clientKey] as? String else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.clientKey)]")
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}
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clientCertificate = CryptoContainer(pem: pem)
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clientKey = CryptoContainer(pem: keyPEM)
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} else {
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clientCertificate = nil
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clientKey = nil
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}
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prefersResolvedAddresses = providerConfiguration[S.prefersResolvedAddresses] as? Bool ?? false
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resolvedAddresses = providerConfiguration[S.resolvedAddresses] as? [String]
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guard let endpointProtocolsStrings = providerConfiguration[S.endpointProtocols] as? [String], !endpointProtocolsStrings.isEmpty else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.endpointProtocols)] is nil or empty")
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}
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endpointProtocols = try endpointProtocolsStrings.map { try EndpointProtocol.deserialized($0) }
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self.appGroup = appGroup
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self.cipher = cipher
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self.digest = digest
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self.ca = ca
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self.clientCertificate = clientCertificate
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self.clientKey = clientKey
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mtu = providerConfiguration[S.mtu] as? Int ?? 1250
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if let compressionFramingValue = providerConfiguration[S.compressionFraming] as? Int, let compressionFraming = SessionProxy.CompressionFraming(rawValue: compressionFramingValue) {
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self.compressionFraming = compressionFraming
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} else {
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compressionFraming = .disabled
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}
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renegotiatesAfterSeconds = providerConfiguration[S.renegotiatesAfter] as? Int
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shouldDebug = providerConfiguration[S.debug] as? Bool ?? false
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if shouldDebug {
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guard let debugLogKey = providerConfiguration[S.debugLogKey] as? String else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.debugLogKey)]")
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}
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self.debugLogKey = debugLogKey
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debugLogFormat = providerConfiguration[S.debugLogFormat] as? String
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} else {
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debugLogKey = nil
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}
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guard !prefersResolvedAddresses || !(resolvedAddresses?.isEmpty ?? true) else {
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throw ProviderError.configuration(field: "protocolConfiguration.providerConfiguration[\(S.prefersResolvedAddresses)] is true but no [\(S.resolvedAddresses)]")
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}
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}
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/**
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Builds a `TunnelKitProvider.Configuration` object that will connect to the provided endpoint.
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- Returns: A `TunnelKitProvider.Configuration` object with this builder and the additional method parameters.
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*/
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public func build() -> Configuration {
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return Configuration(
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appGroup: appGroup,
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prefersResolvedAddresses: prefersResolvedAddresses,
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resolvedAddresses: resolvedAddresses,
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endpointProtocols: endpointProtocols,
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cipher: cipher,
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digest: digest,
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ca: ca,
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clientCertificate: clientCertificate,
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clientKey: clientKey,
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mtu: mtu,
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compressionFraming: compressionFraming,
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renegotiatesAfterSeconds: renegotiatesAfterSeconds,
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shouldDebug: shouldDebug,
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debugLogKey: shouldDebug ? debugLogKey : nil,
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debugLogFormat: shouldDebug ? debugLogFormat : nil
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)
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}
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}
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/// Offers a bridge between the abstract `TunnelKitProvider.ConfigurationBuilder` and a concrete `NETunnelProviderProtocol` profile.
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public struct Configuration {
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struct Keys {
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static let appGroup = "AppGroup"
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static let prefersResolvedAddresses = "PrefersResolvedAddresses"
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static let resolvedAddresses = "ResolvedAddresses"
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static let endpointProtocols = "EndpointProtocols"
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static let cipherAlgorithm = "CipherAlgorithm"
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static let digestAlgorithm = "DigestAlgorithm"
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static let ca = "CA"
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static let clientCertificate = "ClientCertificate"
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static let clientKey = "ClientKey"
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static let mtu = "MTU"
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static let compressionFraming = "CompressionFraming"
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static let renegotiatesAfter = "RenegotiatesAfter"
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static let debug = "Debug"
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static let debugLogKey = "DebugLogKey"
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static let debugLogFormat = "DebugLogFormat"
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}
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.appGroup`
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public let appGroup: String
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.prefersResolvedAddresses`
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public let prefersResolvedAddresses: Bool
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.resolvedAddresses`
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public let resolvedAddresses: [String]?
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.endpointProtocols`
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public let endpointProtocols: [EndpointProtocol]
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.cipher`
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public let cipher: SessionProxy.Cipher
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.digest`
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public let digest: SessionProxy.Digest
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.ca`
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public let ca: CryptoContainer?
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.clientCertificate`
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public let clientCertificate: CryptoContainer?
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.clientKey`
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public let clientKey: CryptoContainer?
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.mtu`
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public let mtu: Int
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.compressionFraming`
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public let compressionFraming: SessionProxy.CompressionFraming
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.renegotiatesAfterSeconds`
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public let renegotiatesAfterSeconds: Int?
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.shouldDebug`
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public let shouldDebug: Bool
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.debugLogKey`
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public let debugLogKey: String?
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/// - Seealso: `TunnelKitProvider.ConfigurationBuilder.debugLogFormat`
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public let debugLogFormat: String?
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// MARK: Shortcuts
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var defaults: UserDefaults? {
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return UserDefaults(suiteName: appGroup)
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}
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var existingLog: [String]? {
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guard shouldDebug, let key = debugLogKey else {
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return nil
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}
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return defaults?.array(forKey: key) as? [String]
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}
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// MARK: API
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/**
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Parses a new `TunnelKitProvider.Configuration` object from a provider configuration map.
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- Parameter from: The map to parse.
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- Returns: The parsed `TunnelKitProvider.Configuration` object.
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- Throws: `ProviderError.configuration` if `providerConfiguration` is incomplete.
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*/
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public static func parsed(from providerConfiguration: [String: Any]) throws -> Configuration {
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let builder = try ConfigurationBuilder(providerConfiguration: providerConfiguration)
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return builder.build()
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}
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/**
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Returns a dictionary representation of this configuration for use with `NETunnelProviderProtocol.providerConfiguration`.
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- Returns: The dictionary representation of `self`.
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*/
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public func generatedProviderConfiguration() -> [String: Any] {
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let S = Keys.self
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var dict: [String: Any] = [
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S.appGroup: appGroup,
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S.prefersResolvedAddresses: prefersResolvedAddresses,
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S.endpointProtocols: endpointProtocols.map { $0.serialized() },
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S.cipherAlgorithm: cipher.rawValue,
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S.digestAlgorithm: digest.rawValue,
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S.mtu: mtu,
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S.debug: shouldDebug
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]
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if let ca = ca {
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dict[S.ca] = ca.pem
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}
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if let clientCertificate = clientCertificate {
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dict[S.clientCertificate] = clientCertificate.pem
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}
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if let clientKey = clientKey {
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dict[S.clientKey] = clientKey.pem
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}
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if let resolvedAddresses = resolvedAddresses {
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dict[S.resolvedAddresses] = resolvedAddresses
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}
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dict[S.compressionFraming] = compressionFraming.rawValue
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if let renegotiatesAfterSeconds = renegotiatesAfterSeconds {
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dict[S.renegotiatesAfter] = renegotiatesAfterSeconds
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}
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if let debugLogKey = debugLogKey {
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dict[S.debugLogKey] = debugLogKey
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}
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if let debugLogFormat = debugLogFormat {
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dict[S.debugLogFormat] = debugLogFormat
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}
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return dict
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}
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/**
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Generates a `NETunnelProviderProtocol` from this configuration.
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- Parameter bundleIdentifier: The provider bundle identifier required to locate the tunnel extension.
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- Parameter endpoint: The `TunnelKitProvider.AuthenticatedEndpoint` the tunnel will connect to.
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- Returns: The generated `NETunnelProviderProtocol` object.
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- Throws: `ProviderError.configuration` if unable to store the `endpoint.password` to the `appGroup` keychain.
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*/
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public func generatedTunnelProtocol(withBundleIdentifier bundleIdentifier: String, endpoint: AuthenticatedEndpoint) throws -> NETunnelProviderProtocol {
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let protocolConfiguration = NETunnelProviderProtocol()
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let keychain = Keychain(group: appGroup)
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do {
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try keychain.set(password: endpoint.password, for: endpoint.username, label: Bundle.main.bundleIdentifier)
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} catch _ {
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throw ProviderError.credentials(field: "keychain.set()")
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}
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protocolConfiguration.providerBundleIdentifier = bundleIdentifier
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protocolConfiguration.serverAddress = endpoint.hostname
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protocolConfiguration.username = endpoint.username
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protocolConfiguration.passwordReference = try? keychain.passwordReference(for: endpoint.username)
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protocolConfiguration.providerConfiguration = generatedProviderConfiguration()
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return protocolConfiguration
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}
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func print(appVersion: String?) {
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if let appVersion = appVersion {
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log.info("App version: \(appVersion)")
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}
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// log.info("Address: \(endpoint.hostname):\(endpoint.port)")
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log.info("Protocols: \(endpointProtocols)")
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log.info("Cipher: \(cipher.rawValue)")
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log.info("Digest: \(digest.rawValue)")
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if let _ = ca {
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log.info("CA verification: enabled")
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} else {
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log.info("CA verification: disabled")
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}
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if let _ = clientCertificate {
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log.info("Client verification: enabled")
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} else {
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log.info("Client verification: disabled")
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}
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log.info("MTU: \(mtu)")
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log.info("Compression framing: \(compressionFraming)")
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if let renegotiatesAfterSeconds = renegotiatesAfterSeconds {
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log.info("Renegotiation: \(renegotiatesAfterSeconds) seconds")
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} else {
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log.info("Renegotiation: never")
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}
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log.info("Debug: \(shouldDebug)")
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}
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}
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}
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// MARK: Modification
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extension TunnelKitProvider.Configuration: Equatable {
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/**
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Returns a `TunnelKitProvider.ConfigurationBuilder` to use this configuration as a starting point for a new one.
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- Returns: An editable `TunnelKitProvider.ConfigurationBuilder` initialized with this configuration.
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*/
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public func builder() -> TunnelKitProvider.ConfigurationBuilder {
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var builder = TunnelKitProvider.ConfigurationBuilder(appGroup: appGroup)
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builder.endpointProtocols = endpointProtocols
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builder.cipher = cipher
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builder.digest = digest
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builder.ca = ca
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builder.clientCertificate = clientCertificate
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builder.clientKey = clientKey
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builder.mtu = mtu
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builder.compressionFraming = compressionFraming
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builder.renegotiatesAfterSeconds = renegotiatesAfterSeconds
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builder.shouldDebug = shouldDebug
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builder.debugLogKey = debugLogKey
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return builder
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}
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|
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/// :nodoc:
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public static func ==(lhs: TunnelKitProvider.Configuration, rhs: TunnelKitProvider.Configuration) -> Bool {
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return (
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(lhs.endpointProtocols == rhs.endpointProtocols) &&
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(lhs.cipher == rhs.cipher) &&
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|
(lhs.digest == rhs.digest) &&
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|
(lhs.ca == rhs.ca) &&
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(lhs.clientCertificate == rhs.clientCertificate) &&
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|
(lhs.clientKey == rhs.clientKey) &&
|
|
(lhs.mtu == rhs.mtu) &&
|
|
(lhs.compressionFraming == rhs.compressionFraming) &&
|
|
(lhs.renegotiatesAfterSeconds == rhs.renegotiatesAfterSeconds)
|
|
)
|
|
}
|
|
}
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