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//
// MultiHopPostQuantumKeyExchanging.swift
// PacketTunnel
//
// Created by Mojgan on 2024-07-15.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import MullvadREST
import MullvadRustRuntime
import MullvadSettings
import MullvadTypes
import PacketTunnelCore
import WireGuardKitTypes
final class MultiHopEphemeralPeerExchanger: EphemeralPeerExchangingProtocol {
let entry: SelectedRelay
let exit: SelectedRelay
let keyExchanger: EphemeralPeerExchangeActorProtocol
let devicePrivateKey: PrivateKey
let onFinish: () -> Void
let onUpdateConfiguration: (EphemeralPeerNegotiationState) async -> Void
let enablePostQuantum: Bool
let enableDaita: Bool
private var entryPeerKey: EphemeralPeerKey!
private var exitPeerKey: EphemeralPeerKey!
private var daitaParameters: DaitaV2Parameters?
private let defaultGatewayAddressRange = [IPAddressRange(from: "\(LocalNetworkIPs.gatewayAddress.rawValue)/32")!]
private let allTrafficRange = [
IPAddressRange(from: "\(LocalNetworkIPs.defaultRouteIpV4.rawValue)/0")!,
IPAddressRange(from: "\(LocalNetworkIPs.defaultRouteIpV6.rawValue)/0")!,
]
private var state: StateMachine = .initial
enum StateMachine {
case initial
case negotiatingWithEntry
case negotiatingBetweenEntryAndExit
case makeConnection
}
init(
entry: SelectedRelay,
exit: SelectedRelay,
devicePrivateKey: PrivateKey,
keyExchanger: EphemeralPeerExchangeActorProtocol,
enablePostQuantum: Bool,
enableDaita: Bool,
onUpdateConfiguration: @escaping (EphemeralPeerNegotiationState) async -> Void,
onFinish: @escaping () -> Void
) {
self.entry = entry
self.exit = exit
self.devicePrivateKey = devicePrivateKey
self.keyExchanger = keyExchanger
self.enablePostQuantum = enablePostQuantum
self.enableDaita = enableDaita
self.onUpdateConfiguration = onUpdateConfiguration
self.onFinish = onFinish
}
func start() async {
guard state == .initial else { return }
await negotiateWithEntry()
}
public func receiveEphemeralPeerPrivateKey(
_ ephemeralPeerPrivateKey: PrivateKey,
daitaParameters: DaitaV2Parameters?
) async {
if state == .negotiatingWithEntry {
self.daitaParameters = daitaParameters
entryPeerKey = EphemeralPeerKey(ephemeralKey: ephemeralPeerPrivateKey)
await negotiateBetweenEntryAndExit()
} else if state == .negotiatingBetweenEntryAndExit {
exitPeerKey = EphemeralPeerKey(ephemeralKey: ephemeralPeerPrivateKey)
await makeConnection()
}
}
func receivePostQuantumKey(
_ preSharedKey: PreSharedKey,
ephemeralKey: PrivateKey,
daitaParameters: DaitaV2Parameters?
) async {
if state == .negotiatingWithEntry {
self.daitaParameters = daitaParameters
entryPeerKey = EphemeralPeerKey(preSharedKey: preSharedKey, ephemeralKey: ephemeralKey)
await negotiateBetweenEntryAndExit()
} else if state == .negotiatingBetweenEntryAndExit {
exitPeerKey = EphemeralPeerKey(preSharedKey: preSharedKey, ephemeralKey: ephemeralKey)
await makeConnection()
}
}
private func negotiateWithEntry() async {
state = .negotiatingWithEntry
await onUpdateConfiguration(
.single(
EphemeralPeerRelayConfiguration(
relay: entry,
configuration: EphemeralPeerConfiguration(
privateKey: devicePrivateKey,
allowedIPs: defaultGatewayAddressRange,
daitaParameters: daitaParameters
)
)))
keyExchanger.startNegotiation(
with: devicePrivateKey,
enablePostQuantum: enablePostQuantum,
enableDaita: enableDaita
)
}
private func negotiateBetweenEntryAndExit() async {
state = .negotiatingBetweenEntryAndExit
await onUpdateConfiguration(
.multi(
entry: EphemeralPeerRelayConfiguration(
relay: entry,
configuration: EphemeralPeerConfiguration(
privateKey: entryPeerKey.ephemeralKey,
preSharedKey: entryPeerKey.preSharedKey,
allowedIPs: [IPAddressRange(from: "\(exit.endpoint.ipv4Relay.ip)/32")!],
daitaParameters: self.daitaParameters
)
),
exit: EphemeralPeerRelayConfiguration(
relay: exit,
configuration: EphemeralPeerConfiguration(
privateKey: devicePrivateKey,
allowedIPs: defaultGatewayAddressRange,
daitaParameters: nil
)
)
))
// Daita is always disabled when negotiating with the exit peer in the multihop scenarios
keyExchanger.startNegotiation(
with: devicePrivateKey,
enablePostQuantum: enablePostQuantum,
enableDaita: false
)
}
private func makeConnection() async {
state = .makeConnection
await onUpdateConfiguration(
.multi(
entry: EphemeralPeerRelayConfiguration(
relay: entry,
configuration: EphemeralPeerConfiguration(
privateKey: entryPeerKey.ephemeralKey,
preSharedKey: entryPeerKey.preSharedKey,
allowedIPs: [IPAddressRange(from: "\(exit.endpoint.ipv4Relay.ip)/32")!],
daitaParameters: self.daitaParameters
)
),
exit: EphemeralPeerRelayConfiguration(
relay: exit,
configuration: EphemeralPeerConfiguration(
privateKey: exitPeerKey.ephemeralKey,
preSharedKey: exitPeerKey.preSharedKey,
allowedIPs: allTrafficRange,
daitaParameters: nil
)
)
))
self.onFinish()
}
}
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