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237 lines
10 KiB
Swift
237 lines
10 KiB
Swift
//
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// InfrastructurePreset.swift
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// Passepartout
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//
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// Created by Davide De Rosa on 8/30/18.
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// Copyright (c) 2021 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 Passepartout.
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//
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// Passepartout 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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// Passepartout 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 Passepartout. If not, see <http://www.gnu.org/licenses/>.
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//
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import Foundation
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import TunnelKit
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// supports a subset of OpenVPNTunnelProvider.Configuration
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// ignores new JSON keys
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public class InfrastructurePreset: Codable {
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public enum ExternalKey: String, Codable {
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case ca
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case client
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case key
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case wrapKeyData = "wrap.key.data"
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case hostname
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}
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public enum PresetKeys: String, CodingKey {
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case id
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case name
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case comment
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case configuration = "cfg"
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case external
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}
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public enum ConfigurationKeys: String, CodingKey {
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case endpointProtocols = "ep"
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case cipher
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case digest = "auth"
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case ca
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case clientCertificate = "client"
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case clientKey = "key"
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case compressionFraming = "frame"
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case compressionAlgorithm = "compression"
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case keepAliveSeconds = "ping"
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case keepAliveTimeoutSeconds = "pingTimeout"
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case renegotiatesAfterSeconds = "reneg"
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case tlsWrap = "wrap"
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case checksEKU = "eku"
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case randomizeEndpoint = "random"
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case usesPIAPatches = "pia"
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}
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public let id: String
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public let name: String
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public let comment: String
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public let configuration: OpenVPNTunnelProvider.Configuration
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public let external: [ExternalKey: String]?
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public func hasProtocol(_ proto: EndpointProtocol) -> Bool {
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return configuration.sessionConfiguration.endpointProtocols?.firstIndex(of: proto) != nil
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}
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public func externalConfiguration(forKey key: ExternalKey, infrastructureName: Infrastructure.Name, pool: Pool) throws -> Any? {
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guard let pattern = external?[key] else {
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return nil
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}
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let baseURL = infrastructureName.externalURL
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switch key {
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case .ca:
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let filename = pattern.replacingOccurrences(of: "${id}", with: pool.id)
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let caURL = baseURL.appendingPathComponent(filename)
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return OpenVPN.CryptoContainer(pem: try String(contentsOf: caURL))
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case .wrapKeyData:
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let filename = pattern.replacingOccurrences(of: "${id}", with: pool.id)
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let tlsKeyURL = baseURL.appendingPathComponent(filename)
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let file = try String(contentsOf: tlsKeyURL)
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return OpenVPN.StaticKey(file: file, direction: .client)
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case .hostname:
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return pattern.replacingOccurrences(of: "${id}", with: pool.id)
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default:
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break
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}
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return nil
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}
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public func injectExternalConfiguration(_ configuration: inout OpenVPNTunnelProvider.ConfigurationBuilder, with infrastructureName: Infrastructure.Name, pool: Pool) throws {
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guard let external = external, !external.isEmpty else {
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return
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}
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var sessionBuilder = configuration.sessionConfiguration.builder()
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if let _ = external[.ca] {
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sessionBuilder.ca = try externalConfiguration(forKey: .ca, infrastructureName: infrastructureName, pool: pool) as? OpenVPN.CryptoContainer
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}
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if let _ = external[.wrapKeyData] {
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if let dummyWrap = sessionBuilder.tlsWrap {
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if let staticKey = try externalConfiguration(forKey: .wrapKeyData, infrastructureName: infrastructureName, pool: pool) as? OpenVPN.StaticKey {
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sessionBuilder.tlsWrap = OpenVPN.TLSWrap(strategy: dummyWrap.strategy, key: staticKey)
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}
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}
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}
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if let _ = external[.hostname] {
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sessionBuilder.hostname = try externalConfiguration(forKey: .hostname, infrastructureName: infrastructureName, pool: pool) as? String
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}
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configuration.sessionConfiguration = sessionBuilder.build()
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}
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// MARK: Codable
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public required init(from decoder: Decoder) throws {
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let container = try decoder.container(keyedBy: PresetKeys.self)
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id = try container.decode(String.self, forKey: .id)
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name = try container.decode(String.self, forKey: .name)
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comment = try container.decode(String.self, forKey: .comment)
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if let rawExternal = try container.decodeIfPresent([String: String].self, forKey: .external) {
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var remapped: [ExternalKey: String] = [:]
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for entry in rawExternal {
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guard let key = ExternalKey(rawValue: entry.key) else {
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continue
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}
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remapped[key] = entry.value
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}
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external = remapped
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} else {
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external = nil
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}
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let cfgContainer = try container.nestedContainer(keyedBy: ConfigurationKeys.self, forKey: .configuration)
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var sessionBuilder = OpenVPN.ConfigurationBuilder()
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sessionBuilder.cipher = try cfgContainer.decode(OpenVPN.Cipher.self, forKey: .cipher)
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if let digest = try cfgContainer.decodeIfPresent(OpenVPN.Digest.self, forKey: .digest) {
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sessionBuilder.digest = digest
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}
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sessionBuilder.compressionFraming = try cfgContainer.decode(OpenVPN.CompressionFraming.self, forKey: .compressionFraming)
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sessionBuilder.compressionAlgorithm = try cfgContainer.decodeIfPresent(OpenVPN.CompressionAlgorithm.self, forKey: .compressionAlgorithm) ?? .disabled
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sessionBuilder.ca = try cfgContainer.decodeIfPresent(OpenVPN.CryptoContainer.self, forKey: .ca)
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sessionBuilder.clientCertificate = try cfgContainer.decodeIfPresent(OpenVPN.CryptoContainer.self, forKey: .clientCertificate)
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sessionBuilder.clientKey = try cfgContainer.decodeIfPresent(OpenVPN.CryptoContainer.self, forKey: .clientKey)
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sessionBuilder.tlsWrap = try cfgContainer.decodeIfPresent(OpenVPN.TLSWrap.self, forKey: .tlsWrap)
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sessionBuilder.keepAliveInterval = try cfgContainer.decodeIfPresent(TimeInterval.self, forKey: .keepAliveSeconds)
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sessionBuilder.keepAliveTimeout = try cfgContainer.decodeIfPresent(TimeInterval.self, forKey: .keepAliveTimeoutSeconds)
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sessionBuilder.renegotiatesAfter = try cfgContainer.decodeIfPresent(TimeInterval.self, forKey: .renegotiatesAfterSeconds)
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sessionBuilder.endpointProtocols = try cfgContainer.decode([EndpointProtocol].self, forKey: .endpointProtocols)
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sessionBuilder.checksEKU = try cfgContainer.decodeIfPresent(Bool.self, forKey: .checksEKU) ?? false
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sessionBuilder.randomizeEndpoint = try cfgContainer.decodeIfPresent(Bool.self, forKey: .randomizeEndpoint) ?? false
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sessionBuilder.usesPIAPatches = try cfgContainer.decodeIfPresent(Bool.self, forKey: .usesPIAPatches) ?? false
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// default to server settings
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sessionBuilder.routingPolicies = nil
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let builder = OpenVPNTunnelProvider.ConfigurationBuilder(sessionConfiguration: sessionBuilder.build())
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configuration = builder.build()
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}
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public func encode(to encoder: Encoder) throws {
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guard let ca = configuration.sessionConfiguration.ca else {
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fatalError("Could not encode nil ca")
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}
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guard let endpointProtocols = configuration.sessionConfiguration.endpointProtocols else {
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fatalError("Could not encode nil endpointProtocols")
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}
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var container = encoder.container(keyedBy: PresetKeys.self)
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try container.encode(id, forKey: .id)
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try container.encode(name, forKey: .name)
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try container.encode(comment, forKey: .comment)
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if let external = external {
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var rawExternal: [String: String] = [:]
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for entry in external {
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rawExternal[entry.key.rawValue] = entry.value
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}
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try container.encode(rawExternal, forKey: .external)
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}
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var cfgContainer = container.nestedContainer(keyedBy: ConfigurationKeys.self, forKey: .configuration)
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try cfgContainer.encode(configuration.sessionConfiguration.cipher, forKey: .cipher)
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try cfgContainer.encode(configuration.sessionConfiguration.digest, forKey: .digest)
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try cfgContainer.encode(configuration.sessionConfiguration.compressionFraming, forKey: .compressionFraming)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.compressionAlgorithm, forKey: .compressionAlgorithm)
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try cfgContainer.encodeIfPresent(ca, forKey: .ca)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.clientCertificate, forKey: .clientCertificate)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.clientKey, forKey: .clientKey)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.tlsWrap, forKey: .tlsWrap)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.keepAliveInterval, forKey: .keepAliveSeconds)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.keepAliveTimeout, forKey: .keepAliveTimeoutSeconds)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.renegotiatesAfter, forKey: .renegotiatesAfterSeconds)
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try cfgContainer.encode(endpointProtocols, forKey: .endpointProtocols)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.checksEKU, forKey: .checksEKU)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.randomizeEndpoint, forKey: .randomizeEndpoint)
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try cfgContainer.encodeIfPresent(configuration.sessionConfiguration.usesPIAPatches, forKey: .usesPIAPatches)
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}
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}
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