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import XCTest
//
// EphemeralPeerExchangingPipelineTests.swift
// MullvadPostQuantumTests
//
// Created by Mojgan on 2024-07-19.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
@testable import MullvadMockData
@testable import MullvadREST
@testable import MullvadRustRuntime
@testable import MullvadTypes
@testable import PacketTunnelCore
@testable import WireGuardKitTypes
final class EphemeralPeerExchangingPipelineTests: XCTestCase {
var entryRelay: SelectedRelay!
var exitRelay: SelectedRelay!
var relayConstraints: RelayConstraints!
override func setUpWithError() throws {
relayConstraints = RelayConstraints(
entryLocations: .only(UserSelectedRelays(locations: [.country("se")])),
exitLocations: .only(UserSelectedRelays(locations: [.country("us")]))
)
let exitMatch = try RelaySelector.WireGuard.pickCandidate(
from: try RelaySelector.WireGuard.findCandidates(
by: relayConstraints.exitLocations,
in: ServerRelaysResponseStubs.sampleRelays,
filterConstraint: relayConstraints.filter,
daitaEnabled: false
),
wireguard: ServerRelaysResponseStubs.sampleRelays.wireguard,
portConstraint: relayConstraints.port,
numberOfFailedAttempts: 0
)
let entryMatch = try RelaySelector.WireGuard.pickCandidate(
from: try RelaySelector.WireGuard.findCandidates(
by: relayConstraints.entryLocations,
in: ServerRelaysResponseStubs.sampleRelays,
filterConstraint: relayConstraints.filter,
daitaEnabled: false
),
wireguard: ServerRelaysResponseStubs.sampleRelays.wireguard,
portConstraint: relayConstraints.port,
numberOfFailedAttempts: 0
)
entryRelay = SelectedRelay(
endpoint: entryMatch.endpoint,
hostname: entryMatch.relay.hostname,
location: entryMatch.location,
features: nil
)
exitRelay = SelectedRelay(
endpoint: exitMatch.endpoint,
hostname: exitMatch.relay.hostname,
location: exitMatch.location,
features: nil
)
}
func testSingleHopPostQuantumKeyExchange() async throws {
let reconfigurationExpectation = expectation(description: "Tunnel reconfiguration took place")
reconfigurationExpectation.expectedFulfillmentCount = 2
let negotiationSuccessful = expectation(description: "Negotiation succeeded.")
negotiationSuccessful.expectedFulfillmentCount = 1
let keyExchangeActor = EphemeralPeerExchangeActorStub()
let preSharedKey = try XCTUnwrap(PreSharedKey(hexKey: PrivateKey().hexKey))
keyExchangeActor.result = .success((preSharedKey, PrivateKey()))
let postQuantumKeyExchangingPipeline = EphemeralPeerExchangingPipeline(keyExchangeActor) { _ in
reconfigurationExpectation.fulfill()
} onFinish: {
negotiationSuccessful.fulfill()
}
keyExchangeActor
.delegate = KeyExchangingResultStub(onReceivePostQuantumKey: { preSharedKey, privateKey, daita in
await postQuantumKeyExchangingPipeline.receivePostQuantumKey(
preSharedKey,
ephemeralKey: privateKey,
daitaParameters: daita
)
})
let connectionState = stubConnectionState(enableMultiHop: false, enablePostQuantum: true, enableDaita: false)
await postQuantumKeyExchangingPipeline.startNegotiation(connectionState, privateKey: PrivateKey())
await fulfillment(of: [reconfigurationExpectation, negotiationSuccessful], timeout: .UnitTest.invertedTimeout)
}
func testSingleHopDaitaPeerExchange() async throws {
let reconfigurationExpectation = expectation(description: "Tunnel reconfiguration took place")
reconfigurationExpectation.expectedFulfillmentCount = 2
let negotiationSuccessful = expectation(description: "Negotiation succeeded.")
negotiationSuccessful.expectedFulfillmentCount = 1
let keyExchangeActor = EphemeralPeerExchangeActorStub()
let preSharedKey = try XCTUnwrap(PreSharedKey(hexKey: PrivateKey().hexKey))
keyExchangeActor.result = .success((preSharedKey, PrivateKey()))
let postQuantumKeyExchangingPipeline = EphemeralPeerExchangingPipeline(keyExchangeActor) { _ in
reconfigurationExpectation.fulfill()
} onFinish: {
negotiationSuccessful.fulfill()
}
keyExchangeActor
.delegate = KeyExchangingResultStub(onReceiveEphemeralPeerPrivateKey: { privateKey, daitaParameters in
await postQuantumKeyExchangingPipeline.receiveEphemeralPeerPrivateKey(
privateKey,
daitaParameters: daitaParameters
)
})
let connectionState = stubConnectionState(enableMultiHop: false, enablePostQuantum: false, enableDaita: true)
await postQuantumKeyExchangingPipeline.startNegotiation(connectionState, privateKey: PrivateKey())
await fulfillment(of: [reconfigurationExpectation, negotiationSuccessful], timeout: .UnitTest.invertedTimeout)
}
func testMultiHopPostQuantumKeyExchange() async throws {
let reconfigurationExpectation = expectation(description: "Tunnel reconfiguration took place")
reconfigurationExpectation.expectedFulfillmentCount = 3
let negotiationSuccessful = expectation(description: "Negotiation succeeded.")
negotiationSuccessful.expectedFulfillmentCount = 1
let keyExchangeActor = EphemeralPeerExchangeActorStub()
let preSharedKey = try XCTUnwrap(PreSharedKey(hexKey: PrivateKey().hexKey))
keyExchangeActor.result = .success((preSharedKey, PrivateKey()))
let postQuantumKeyExchangingPipeline = EphemeralPeerExchangingPipeline(keyExchangeActor) { _ in
reconfigurationExpectation.fulfill()
} onFinish: {
negotiationSuccessful.fulfill()
}
keyExchangeActor
.delegate = KeyExchangingResultStub(onReceivePostQuantumKey: { preSharedKey, privateKey, daita in
await postQuantumKeyExchangingPipeline.receivePostQuantumKey(
preSharedKey,
ephemeralKey: privateKey,
daitaParameters: daita
)
})
let connectionState = stubConnectionState(enableMultiHop: true, enablePostQuantum: true, enableDaita: false)
await postQuantumKeyExchangingPipeline.startNegotiation(connectionState, privateKey: PrivateKey())
await fulfillment(of: [reconfigurationExpectation, negotiationSuccessful], timeout: .UnitTest.invertedTimeout)
}
func testMultiHopDaitaExchange() async throws {
let reconfigurationExpectation = expectation(description: "Tunnel reconfiguration took place")
reconfigurationExpectation.expectedFulfillmentCount = 3
let negotiationSuccessful = expectation(description: "Negotiation succeeded.")
negotiationSuccessful.expectedFulfillmentCount = 1
let keyExchangeActor = EphemeralPeerExchangeActorStub()
let preSharedKey = try XCTUnwrap(PreSharedKey(hexKey: PrivateKey().hexKey))
keyExchangeActor.result = .success((preSharedKey, PrivateKey()))
let postQuantumKeyExchangingPipeline = EphemeralPeerExchangingPipeline(keyExchangeActor) { _ in
reconfigurationExpectation.fulfill()
} onFinish: {
negotiationSuccessful.fulfill()
}
keyExchangeActor.delegate = KeyExchangingResultStub(onReceiveEphemeralPeerPrivateKey: { privateKey, daita in
await postQuantumKeyExchangingPipeline.receiveEphemeralPeerPrivateKey(privateKey, daitaParameters: daita)
})
let connectionState = stubConnectionState(enableMultiHop: true, enablePostQuantum: false, enableDaita: true)
await postQuantumKeyExchangingPipeline.startNegotiation(connectionState, privateKey: PrivateKey())
await fulfillment(of: [reconfigurationExpectation, negotiationSuccessful], timeout: .UnitTest.invertedTimeout)
}
func stubConnectionState(
enableMultiHop: Bool,
enablePostQuantum: Bool,
enableDaita: Bool
) -> ObservedConnectionState {
ObservedConnectionState(
selectedRelays: SelectedRelays(
entry: enableMultiHop ? entryRelay : nil,
exit: exitRelay,
retryAttempt: 0,
obfuscation: .off
),
relayConstraints: relayConstraints,
networkReachability: NetworkReachability.reachable,
connectionAttemptCount: 0,
transportLayer: .udp,
remotePort: 1234,
isPostQuantum: enablePostQuantum,
isDaitaEnabled: enableDaita
)
}
}
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