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Have the PacketTunnel use UDP-over-TCP Obfuscation
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@buggmagnet
buggmagnet committed Nov 27, 2023
1 parent 851b134 commit 78e389e
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Showing 21 changed files with 325 additions and 30 deletions.
10 changes: 9 additions & 1 deletion ios/MullvadSettings/WireGuardObfuscationSettings.swift
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Expand Up @@ -8,19 +8,27 @@

import Foundation

/// Whether UDP-over-TCP obfuscation is enabled
///
/// `.automatic` means an algorithm will decide whether to use it or not.
public enum WireGuardObfuscationState: Codable {
case automatic
case on
case off
}

/// The port to select when using UDP-over-TCP obfuscation
///
/// `.automatic` means an algorith will decide between using `port80` or `port5001`
public enum WireGuardObfuscationPort: UInt16, Codable {
case automatic = 0
case port80 = 80
case port5001 = 5001

/// The `UInt16` representation of the port.
/// - Returns: `0` if `.automatic`, `80` or `5001` otherwise.
public var portValue: UInt16 {
rawValue
self == .automatic ? 0 : rawValue
}

public init?(rawValue: UInt16) {
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44 changes: 38 additions & 6 deletions ios/MullvadVPN.xcodeproj/project.pbxproj
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Expand Up @@ -95,7 +95,7 @@
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Expand Down Expand Up @@ -268,7 +268,7 @@
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Expand Down Expand Up @@ -506,11 +506,17 @@
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Expand Down Expand Up @@ -981,6 +987,13 @@
remoteGlobalIDString = 7A88DCCD2A8FABBE00D2FF0E;
remoteInfo = Routing;
};
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remoteInfo = TunnelObfuscation;
};
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Expand Down Expand Up @@ -1265,7 +1278,7 @@
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5840250322B11AB700E4CFEC /* MullvadEndpoint.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MullvadEndpoint.swift; sourceTree = "<group>"; };
Expand Down Expand Up @@ -1617,6 +1630,10 @@
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A97F1F432A1F4E1A00ECEFDE /* MullvadTransport.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MullvadTransport.h; sourceTree = "<group>"; };
Expand Down Expand Up @@ -1761,6 +1778,8 @@
isa = PBXFrameworksBuildPhase;
buildActionMask = 2147483647;
files = (
A91D78E42B03C01600FCD5D3 /* MullvadSettings.framework in Frameworks */,
A91D78E32B03BDF200FCD5D3 /* TunnelObfuscation.framework in Frameworks */,
58238CB92AD57EC700768310 /* MullvadREST.framework in Frameworks */,
A94D691A2ABAD66700413DD4 /* WireGuardKitTypes in Frameworks */,
58FE65952AB1D90600E53CB5 /* MullvadTypes.framework in Frameworks */,
Expand Down Expand Up @@ -2324,7 +2343,7 @@
589C6A7A2A45ACCA00DAD3EF /* Info.plist */,
584023272A407679007B27AC /* tunnel_obfuscator_proxy.h */,
589C6A7B2A45AE0100DAD3EF /* TunnelObfuscation.h */,
584023212A406BF5007B27AC /* TunnelObfuscator.swift */,
584023212A406BF5007B27AC /* UDPOverTCPObfuscator.swift */,
);
path = TunnelObfuscation;
sourceTree = "<group>";
Expand Down Expand Up @@ -2402,6 +2421,7 @@
586C14592AC4735F00245C01 /* PacketTunnelActor+Public.swift */,
583832262AC3193600EA2071 /* PacketTunnelActor+SleepCycle.swift */,
7AD0AA192AD69B6E00119E10 /* PacketTunnelActorProtocol.swift */,
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58E7A0312AA0715100C57861 /* Protocols */,
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5824030C2A811B0000163DE8 /* State.swift */,
Expand Down Expand Up @@ -2653,6 +2673,7 @@
58C7A46F2A8649ED0060C66F /* PingerTests.swift */,
5838321C2AC1C54600EA2071 /* TaskSleepTests.swift */,
58092E532A8B832E00C3CC72 /* TunnelMonitorTests.swift */,
A97D25B12B0CB02D00946B2D /* ProtocolObfuscatorTests.swift */,
);
path = PacketTunnelCoreTests;
sourceTree = "<group>";
Expand Down Expand Up @@ -2915,6 +2936,8 @@
5838321A2AC1B18400EA2071 /* PacketTunnelActor+Mocks.swift */,
7AD0AA1B2AD6A63F00119E10 /* PacketTunnelActorStub.swift */,
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A97D25AF2B0BB5C400946B2D /* ProtocolObfuscationStub.swift */,
A97D25B32B0CB59300946B2D /* TunnelObfuscationStub.swift */,
);
path = Mocks;
sourceTree = "<group>";
Expand Down Expand Up @@ -3400,6 +3423,7 @@
buildRules = (
);
dependencies = (
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Expand Down Expand Up @@ -4075,7 +4099,7 @@
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
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runOnlyForDeploymentPostprocessing = 0;
};
Expand Down Expand Up @@ -4298,6 +4322,7 @@
7AD0AA1F2AD6C8B900119E10 /* URLRequestProxyProtocol.swift in Sources */,
7A6B4F592AB8412E00123853 /* TunnelMonitorTimings.swift in Sources */,
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A97D25AE2B0BB18100946B2D /* ProtocolObfuscator.swift in Sources */,
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58FE25D82AA72A8F003D1918 /* ConfigurationBuilder.swift in Sources */,
7AEF7F1A2AD00F52006FE45D /* AppMessageHandler.swift in Sources */,
Expand Down Expand Up @@ -4335,12 +4360,15 @@
58FE25F02AA77664003D1918 /* RelaySelectorStub.swift in Sources */,
581F23AF2A8CF94D00788AB6 /* PingerMock.swift in Sources */,
7A3FD1B62AD542110042BEA6 /* ServerRelaysResponse+Stubs.swift in Sources */,
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58FE25F22AA77674003D1918 /* SettingsReaderStub.swift in Sources */,
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58FE25D42AA729B5003D1918 /* PacketTunnelActorTests.swift in Sources */,
7A3FD1B52AD4465A0042BEA6 /* AppMessageHandlerTests.swift in Sources */,
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A97D25B22B0CB02D00946B2D /* ProtocolObfuscatorTests.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
Expand Down Expand Up @@ -4831,7 +4859,6 @@
};
58C7A45F2A8640490060C66F /* PBXTargetDependency */ = {
isa = PBXTargetDependency;
platformFilter = ios;
target = 58D223F2294C8FF00029F5F8 /* MullvadLogging */;
targetProxy = 58C7A45E2A8640490060C66F /* PBXContainerItemProxy */;
};
Expand Down Expand Up @@ -4976,6 +5003,11 @@
target = 7A88DCCD2A8FABBE00D2FF0E /* Routing */;
targetProxy = 7ABCA5B52A9349F20044A708 /* PBXContainerItemProxy */;
};
A91D78E22B03BDE500FCD5D3 /* PBXTargetDependency */ = {
isa = PBXTargetDependency;
target = 5840231E2A406BF5007B27AC /* TunnelObfuscation */;
targetProxy = A91D78E12B03BDE500FCD5D3 /* PBXContainerItemProxy */;
};
A97F1F462A1F4E1A00ECEFDE /* PBXTargetDependency */ = {
isa = PBXTargetDependency;
target = A97F1F402A1F4E1A00ECEFDE /* MullvadTransport */;
Expand Down
3 changes: 2 additions & 1 deletion ios/MullvadVPN/SimulatorTunnelProvider/SimulatorTunnelProviderHost.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -170,7 +170,8 @@ final class SimulatorTunnelProviderHost: SimulatorTunnelProviderDelegate {
return SelectedRelay(
endpoint: selectorResult.endpoint,
hostname: selectorResult.relay.hostname,
location: selectorResult.location
location: selectorResult.location,
retryAttempts: 0
)
}

Expand Down
7 changes: 4 additions & 3 deletions ios/MullvadVPN/TunnelManager/TunnelManager.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -823,16 +823,18 @@ final class TunnelManager: StorePaymentObserver {

fileprivate func selectRelay() throws -> SelectedRelay {
let cachedRelays = try relayCacheTracker.getCachedRelays()
let retryAttempts = tunnelStatus.observedState.connectionState?.connectionAttemptCount ?? 0
let selectorResult = try RelaySelector.evaluate(
relays: cachedRelays.relays,
constraints: settings.relayConstraints,
numberOfFailedAttempts: tunnelStatus.observedState.connectionState?.connectionAttemptCount ?? 0
numberOfFailedAttempts: retryAttempts
)

return SelectedRelay(
endpoint: selectorResult.endpoint,
hostname: selectorResult.relay.hostname,
location: selectorResult.location
location: selectorResult.location,
retryAttempts: retryAttempts
)
}

Expand Down Expand Up @@ -992,7 +994,6 @@ final class TunnelManager: StorePaymentObserver {
let updatedConstraints = updatedSettings.relayConstraints
let selectNewRelay = currentConstraints != updatedConstraints

// TODO: Handle using an obfuscator here
self.setSettings(updatedSettings, persist: true)
self.reconnectTunnel(selectNewRelay: selectNewRelay, completionHandler: nil)
}
Expand Down
1 change: 1 addition & 0 deletions ios/PacketTunnel/PacketTunnelProvider/PacketTunnelProvider.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ import MullvadTypes
import NetworkExtension
import PacketTunnelCore
import RelayCache
import TunnelObfuscation

class PacketTunnelProvider: NEPacketTunnelProvider {
private let internalQueue = DispatchQueue(label: "PacketTunnel-internalQueue")
Expand Down
3 changes: 2 additions & 1 deletion ios/PacketTunnel/PacketTunnelProvider/RelaySelectorWrapper.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,8 @@ struct RelaySelectorWrapper: RelaySelectorProtocol {
return SelectedRelay(
endpoint: selectorResult.endpoint,
hostname: selectorResult.relay.hostname,
location: selectorResult.location
location: selectorResult.location,
retryAttempts: connectionAttemptFailureCount
)
}
}
3 changes: 2 additions & 1 deletion ios/PacketTunnel/PacketTunnelProvider/SettingsReader.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,8 @@ struct SettingsReader: SettingsReaderProtocol {
privateKey: deviceData.wgKeyData.privateKey,
interfaceAddresses: [deviceData.ipv4Address, deviceData.ipv6Address],
relayConstraints: settings.relayConstraints,
dnsServers: settings.dnsSettings.selectedDNSServers
dnsServers: settings.dnsSettings.selectedDNSServers,
obfuscation: settings.wireGuardObfuscation
)
}
}
Expand Down
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