diff options
Diffstat (limited to 'Sources/Shared/Model/TunnelConfiguration+WgQuickConfig.swift')
| -rw-r--r-- | Sources/Shared/Model/TunnelConfiguration+WgQuickConfig.swift | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/Sources/Shared/Model/TunnelConfiguration+WgQuickConfig.swift b/Sources/Shared/Model/TunnelConfiguration+WgQuickConfig.swift new file mode 100644 index 0000000..7fd65d6 --- /dev/null +++ b/Sources/Shared/Model/TunnelConfiguration+WgQuickConfig.swift @@ -0,0 +1,248 @@ +// SPDX-License-Identifier: MIT +// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved. + +import Foundation +import WireGuardKit + +extension TunnelConfiguration { + + enum ParserState { + case inInterfaceSection + case inPeerSection + case notInASection + } + + enum ParseError: Error { + case invalidLine(String.SubSequence) + case noInterface + case multipleInterfaces + case interfaceHasNoPrivateKey + case interfaceHasInvalidPrivateKey(String) + case interfaceHasInvalidListenPort(String) + case interfaceHasInvalidAddress(String) + case interfaceHasInvalidDNS(String) + case interfaceHasInvalidMTU(String) + case interfaceHasUnrecognizedKey(String) + case peerHasNoPublicKey + case peerHasInvalidPublicKey(String) + case peerHasInvalidPreSharedKey(String) + case peerHasInvalidAllowedIP(String) + case peerHasInvalidEndpoint(String) + case peerHasInvalidPersistentKeepAlive(String) + case peerHasInvalidTransferBytes(String) + case peerHasInvalidLastHandshakeTime(String) + case peerHasUnrecognizedKey(String) + case multiplePeersWithSamePublicKey + case multipleEntriesForKey(String) + } + + convenience init(fromWgQuickConfig wgQuickConfig: String, called name: String? = nil) throws { + var interfaceConfiguration: InterfaceConfiguration? + var peerConfigurations = [PeerConfiguration]() + + let lines = wgQuickConfig.split { $0.isNewline } + + var parserState = ParserState.notInASection + var attributes = [String: String]() + + for (lineIndex, line) in lines.enumerated() { + var trimmedLine: String + if let commentRange = line.range(of: "#") { + trimmedLine = String(line[..<commentRange.lowerBound]) + } else { + trimmedLine = String(line) + } + + trimmedLine = trimmedLine.trimmingCharacters(in: .whitespacesAndNewlines) + let lowercasedLine = trimmedLine.lowercased() + + if !trimmedLine.isEmpty { + if let equalsIndex = trimmedLine.firstIndex(of: "=") { + // Line contains an attribute + let keyWithCase = trimmedLine[..<equalsIndex].trimmingCharacters(in: .whitespacesAndNewlines) + let key = keyWithCase.lowercased() + let value = trimmedLine[trimmedLine.index(equalsIndex, offsetBy: 1)...].trimmingCharacters(in: .whitespacesAndNewlines) + let keysWithMultipleEntriesAllowed: Set<String> = ["address", "allowedips", "dns"] + if let presentValue = attributes[key] { + if keysWithMultipleEntriesAllowed.contains(key) { + attributes[key] = presentValue + "," + value + } else { + throw ParseError.multipleEntriesForKey(keyWithCase) + } + } else { + attributes[key] = value + } + let interfaceSectionKeys: Set<String> = ["privatekey", "listenport", "address", "dns", "mtu"] + let peerSectionKeys: Set<String> = ["publickey", "presharedkey", "allowedips", "endpoint", "persistentkeepalive"] + if parserState == .inInterfaceSection { + guard interfaceSectionKeys.contains(key) else { + throw ParseError.interfaceHasUnrecognizedKey(keyWithCase) + } + } else if parserState == .inPeerSection { + guard peerSectionKeys.contains(key) else { + throw ParseError.peerHasUnrecognizedKey(keyWithCase) + } + } + } else if lowercasedLine != "[interface]" && lowercasedLine != "[peer]" { + throw ParseError.invalidLine(line) + } + } + + let isLastLine = lineIndex == lines.count - 1 + + if isLastLine || lowercasedLine == "[interface]" || lowercasedLine == "[peer]" { + // Previous section has ended; process the attributes collected so far + if parserState == .inInterfaceSection { + let interface = try TunnelConfiguration.collate(interfaceAttributes: attributes) + guard interfaceConfiguration == nil else { throw ParseError.multipleInterfaces } + interfaceConfiguration = interface + } else if parserState == .inPeerSection { + let peer = try TunnelConfiguration.collate(peerAttributes: attributes) + peerConfigurations.append(peer) + } + } + + if lowercasedLine == "[interface]" { + parserState = .inInterfaceSection + attributes.removeAll() + } else if lowercasedLine == "[peer]" { + parserState = .inPeerSection + attributes.removeAll() + } + } + + let peerPublicKeysArray = peerConfigurations.map { $0.publicKey } + let peerPublicKeysSet = Set<PublicKey>(peerPublicKeysArray) + if peerPublicKeysArray.count != peerPublicKeysSet.count { + throw ParseError.multiplePeersWithSamePublicKey + } + + if let interfaceConfiguration = interfaceConfiguration { + self.init(name: name, interface: interfaceConfiguration, peers: peerConfigurations) + } else { + throw ParseError.noInterface + } + } + + func asWgQuickConfig() -> String { + var output = "[Interface]\n" + output.append("PrivateKey = \(interface.privateKey.base64Key)\n") + if let listenPort = interface.listenPort { + output.append("ListenPort = \(listenPort)\n") + } + if !interface.addresses.isEmpty { + let addressString = interface.addresses.map { $0.stringRepresentation }.joined(separator: ", ") + output.append("Address = \(addressString)\n") + } + if !interface.dns.isEmpty { + let dnsString = interface.dns.map { $0.stringRepresentation }.joined(separator: ", ") + output.append("DNS = \(dnsString)\n") + } + if let mtu = interface.mtu { + output.append("MTU = \(mtu)\n") + } + + for peer in peers { + output.append("\n[Peer]\n") + output.append("PublicKey = \(peer.publicKey.base64Key)\n") + if let preSharedKey = peer.preSharedKey?.base64Key { + output.append("PresharedKey = \(preSharedKey)\n") + } + if !peer.allowedIPs.isEmpty { + let allowedIPsString = peer.allowedIPs.map { $0.stringRepresentation }.joined(separator: ", ") + output.append("AllowedIPs = \(allowedIPsString)\n") + } + if let endpoint = peer.endpoint { + output.append("Endpoint = \(endpoint.stringRepresentation)\n") + } + if let persistentKeepAlive = peer.persistentKeepAlive { + output.append("PersistentKeepalive = \(persistentKeepAlive)\n") + } + } + + return output + } + + private static func collate(interfaceAttributes attributes: [String: String]) throws -> InterfaceConfiguration { + guard let privateKeyString = attributes["privatekey"] else { + throw ParseError.interfaceHasNoPrivateKey + } + guard let privateKey = PrivateKey(base64Key: privateKeyString) else { + throw ParseError.interfaceHasInvalidPrivateKey(privateKeyString) + } + var interface = InterfaceConfiguration(privateKey: privateKey) + if let listenPortString = attributes["listenport"] { + guard let listenPort = UInt16(listenPortString) else { + throw ParseError.interfaceHasInvalidListenPort(listenPortString) + } + interface.listenPort = listenPort + } + if let addressesString = attributes["address"] { + var addresses = [IPAddressRange]() + for addressString in addressesString.splitToArray(trimmingCharacters: .whitespacesAndNewlines) { + guard let address = IPAddressRange(from: addressString) else { + throw ParseError.interfaceHasInvalidAddress(addressString) + } + addresses.append(address) + } + interface.addresses = addresses + } + if let dnsString = attributes["dns"] { + var dnsServers = [DNSServer]() + for dnsServerString in dnsString.splitToArray(trimmingCharacters: .whitespacesAndNewlines) { + guard let dnsServer = DNSServer(from: dnsServerString) else { + throw ParseError.interfaceHasInvalidDNS(dnsServerString) + } + dnsServers.append(dnsServer) + } + interface.dns = dnsServers + } + if let mtuString = attributes["mtu"] { + guard let mtu = UInt16(mtuString) else { + throw ParseError.interfaceHasInvalidMTU(mtuString) + } + interface.mtu = mtu + } + return interface + } + + private static func collate(peerAttributes attributes: [String: String]) throws -> PeerConfiguration { + guard let publicKeyString = attributes["publickey"] else { + throw ParseError.peerHasNoPublicKey + } + guard let publicKey = PublicKey(base64Key: publicKeyString) else { + throw ParseError.peerHasInvalidPublicKey(publicKeyString) + } + var peer = PeerConfiguration(publicKey: publicKey) + if let preSharedKeyString = attributes["presharedkey"] { + guard let preSharedKey = PreSharedKey(base64Key: preSharedKeyString) else { + throw ParseError.peerHasInvalidPreSharedKey(preSharedKeyString) + } + peer.preSharedKey = preSharedKey + } + if let allowedIPsString = attributes["allowedips"] { + var allowedIPs = [IPAddressRange]() + for allowedIPString in allowedIPsString.splitToArray(trimmingCharacters: .whitespacesAndNewlines) { + guard let allowedIP = IPAddressRange(from: allowedIPString) else { + throw ParseError.peerHasInvalidAllowedIP(allowedIPString) + } + allowedIPs.append(allowedIP) + } + peer.allowedIPs = allowedIPs + } + if let endpointString = attributes["endpoint"] { + guard let endpoint = Endpoint(from: endpointString) else { + throw ParseError.peerHasInvalidEndpoint(endpointString) + } + peer.endpoint = endpoint + } + if let persistentKeepAliveString = attributes["persistentkeepalive"] { + guard let persistentKeepAlive = UInt16(persistentKeepAliveString) else { + throw ParseError.peerHasInvalidPersistentKeepAlive(persistentKeepAliveString) + } + peer.persistentKeepAlive = persistentKeepAlive + } + return peer + } + +} |