[AltDaemon] Replaces local socket communication with XPC

Allows AltDaemon to be launched on demand + reject any connections not made from AltStore.

AltDaemon/AltDaemon-Bridging-Header.h

@@ -10,6 +10,23 @@
 #import "NSError+ALTServerError.h"
 #import "CFNotificationName+AltStore.h"
 
+// libproc
+int proc_pidpath(int pid, void * buffer, uint32_t buffersize);
+
+// Security.framework
+CF_ENUM(uint32_t) {
+    kSecCSInternalInformation = 1 << 0,
+    kSecCSSigningInformation = 1 << 1,
+    kSecCSRequirementInformation = 1 << 2,
+    kSecCSDynamicInformation = 1 << 3,
+    kSecCSContentInformation = 1 << 4,
+    kSecCSSkipResourceDirectory = 1 << 5,
+    kSecCSCalculateCMSDigest = 1 << 6,
+};
+
+OSStatus SecStaticCodeCreateWithPath(CFURLRef path, uint32_t flags, void ** __nonnull CF_RETURNS_RETAINED staticCode);
+OSStatus SecCodeCopySigningInformation(void *code, uint32_t flags, CFDictionaryRef * __nonnull CF_RETURNS_RETAINED information);
+
 NS_ASSUME_NONNULL_BEGIN
 
 @interface AKDevice : NSObject

AltDaemon/AppManager.swift

@@ -75,7 +75,8 @@ struct AppManager
                 // Remove all inactive profiles (if active profiles are provided), and the previous profiles.
                 for fileURL in profileURLs
                 {
-                    guard let profile = ALTProvisioningProfile(url: fileURL) else { continue }
+                    // Use memory mapping to reduce peak memory usage and stay within limit.
+                    guard let profile = try? ALTProvisioningProfile(url: fileURL, options: [.mappedIfSafe]) else { continue }
                     
                     if installingBundleIDs.contains(profile.bundleIdentifier) || (activeProfiles?.contains(profile.bundleIdentifier) == false && profile.isFreeProvisioningProfile)
                     {

AltDaemon/DaemonRequestHandler.swift

@@ -1,6 +1,6 @@
 //
-//  ConnectionManager.swift
-//  AltServer
+//  DaemonRequestHandler.swift
+//  AltDaemon
 //
 //  Created by Riley Testut on 6/1/20.
 //  Copyright © 2019 Riley Testut. All rights reserved.
@@ -11,7 +11,7 @@ import Foundation
 typealias DaemonConnectionManager = ConnectionManager<DaemonRequestHandler>
 
 private let connectionManager = ConnectionManager(requestHandler: DaemonRequestHandler(),
-                                                  connectionHandlers: [LocalConnectionHandler()])
+                                                  connectionHandlers: [XPCConnectionHandler()])
 
 extension DaemonConnectionManager
 {

AltDaemon/LocalConnectionHandler.swift

@@ -1,108 +0,0 @@
-//
-//  LocalConnectionHandler.swift
-//  AltDaemon
-//
-//  Created by Riley Testut on 6/2/20.
-//  Copyright © 2020 Riley Testut. All rights reserved.
-//
-
-import Foundation
-import Network
-
-private let ReceivedLocalServerConnectionRequest: @convention(c) (CFNotificationCenter?, UnsafeMutableRawPointer?, CFNotificationName?, UnsafeRawPointer?, CFDictionary?) -> Void =
-{ (center, observer, name, object, userInfo) in
-    guard let name = name, let observer = observer else { return }
-    
-    let connection = unsafeBitCast(observer, to: LocalConnectionHandler.self)
-    connection.handle(name)
-}
-
-class LocalConnectionHandler: ConnectionHandler
-{
-    var connectionHandler: ((Connection) -> Void)?
-    var disconnectionHandler: ((Connection) -> Void)?
-    
-    private let dispatchQueue = DispatchQueue(label: "io.altstore.LocalConnectionListener", qos: .utility)
-    
-    deinit
-    {
-        self.stopListening()
-    }
-        
-    func startListening()
-    {
-        let notificationCenter = CFNotificationCenterGetDarwinNotifyCenter()
-        let observer = Unmanaged.passUnretained(self).toOpaque()
-        
-        CFNotificationCenterAddObserver(notificationCenter, observer, ReceivedLocalServerConnectionRequest, CFNotificationName.localServerConnectionAvailableRequest.rawValue, nil, .deliverImmediately)
-        CFNotificationCenterAddObserver(notificationCenter, observer, ReceivedLocalServerConnectionRequest, CFNotificationName.localServerConnectionStartRequest.rawValue, nil, .deliverImmediately)
-    }
-    
-    func stopListening()
-    {
-        let notificationCenter = CFNotificationCenterGetDarwinNotifyCenter()
-        let observer = Unmanaged.passUnretained(self).toOpaque()
-        
-        CFNotificationCenterRemoveObserver(notificationCenter, observer, .localServerConnectionAvailableRequest, nil)
-        CFNotificationCenterRemoveObserver(notificationCenter, observer, .localServerConnectionStartRequest, nil)
-    }
-    
-    fileprivate func handle(_ notification: CFNotificationName)
-    {
-        switch notification
-        {
-        case .localServerConnectionAvailableRequest:
-            let notificationCenter = CFNotificationCenterGetDarwinNotifyCenter()
-            CFNotificationCenterPostNotification(notificationCenter, .localServerConnectionAvailableResponse, nil, nil, true)
-
-        case .localServerConnectionStartRequest:
-            let connection = NWConnection(host: "localhost", port: NWEndpoint.Port(rawValue: ALTDeviceListeningSocket)!, using: .tcp)
-            self.start(connection)
-
-        default: break
-        }
-    }
-}
-
-private extension LocalConnectionHandler
-{
-    func start(_ nwConnection: NWConnection)
-    {
-        print("Starting connection to:", nwConnection)
-        
-        // Use same instance for all callbacks.
-        let connection = NetworkConnection(nwConnection)
-        
-        nwConnection.stateUpdateHandler = { [weak self] (state) in
-            switch state
-            {
-            case .setup, .preparing: break
-                
-            case .ready:
-                print("Connected to client:", nwConnection.endpoint)
-                self?.connectionHandler?(connection)
-                
-            case .waiting:
-                print("Waiting for connection...")
-                
-            case .failed(let error):
-                print("Failed to connect to service \(nwConnection.endpoint).", error)
-                self?.disconnect(connection)
-                
-            case .cancelled:
-                self?.disconnect(connection)
-                
-            @unknown default: break
-            }
-        }
-        
-        nwConnection.start(queue: self.dispatchQueue)
-    }
-    
-    func disconnect(_ connection: Connection)
-    {
-        connection.disconnect()
-        
-        self.disconnectionHandler?(connection)
-    }
-}

AltDaemon/XPCConnectionHandler.swift

@@ -0,0 +1,90 @@
+//
+//  XPCConnectionHandler.swift
+//  AltDaemon
+//
+//  Created by Riley Testut on 9/14/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import Security
+
+class XPCConnectionHandler: NSObject, ConnectionHandler
+{
+    var connectionHandler: ((Connection) -> Void)?
+    var disconnectionHandler: ((Connection) -> Void)?
+    
+    private let dispatchQueue = DispatchQueue(label: "io.altstore.XPCConnectionListener", qos: .utility)
+    private let listener = NSXPCListener.makeListener(machServiceName: XPCConnection.machServiceName)
+    
+    deinit
+    {
+        self.stopListening()
+    }
+        
+    func startListening()
+    {
+        self.listener.delegate = self
+        self.listener.resume()
+    }
+    
+    func stopListening()
+    {
+        self.listener.suspend()
+    }
+}
+
+private extension XPCConnectionHandler
+{
+    func disconnect(_ connection: Connection)
+    {
+        connection.disconnect()
+        
+        self.disconnectionHandler?(connection)
+    }
+}
+
+extension XPCConnectionHandler: NSXPCListenerDelegate
+{
+    func listener(_ listener: NSXPCListener, shouldAcceptNewConnection newConnection: NSXPCConnection) -> Bool
+    {
+        let maximumPathLength = 4 * UInt32(MAXPATHLEN)
+        
+        let pathBuffer = UnsafeMutablePointer<CChar>.allocate(capacity: Int(maximumPathLength))
+        defer { pathBuffer.deallocate() }
+        
+        proc_pidpath(newConnection.processIdentifier, pathBuffer, maximumPathLength)
+        
+        let path = String(cString: pathBuffer)
+        let fileURL = URL(fileURLWithPath: path)
+                
+        var code: UnsafeMutableRawPointer?
+        defer { code.map { Unmanaged<AnyObject>.fromOpaque($0).release() } }
+        
+        var status = SecStaticCodeCreateWithPath(fileURL as CFURL, 0, &code)
+        guard status == 0 else { return false }
+        
+        var signingInfo: CFDictionary?
+        defer { signingInfo.map { Unmanaged<AnyObject>.passUnretained($0).release() } }
+        
+        status = SecCodeCopySigningInformation(code, kSecCSInternalInformation | kSecCSSigningInformation, &signingInfo)
+        guard status == 0 else { return false }
+        
+        // Only accept connections from AltStore.
+        guard
+            let codeSigningInfo = signingInfo as? [String: Any],
+            let bundleIdentifier = codeSigningInfo["identifier"] as? String,
+            bundleIdentifier.contains("com.rileytestut.AltStore")
+        else { return false }
+        
+        let connection = XPCConnection(newConnection)
+        newConnection.invalidationHandler = { [weak self, weak connection] in
+            guard let self = self, let connection = connection else { return }
+            self.disconnect(connection)
+        }
+
+        self.connectionHandler?(connection)
+        
+        return true
+    }
+}

AltDaemon/package/Library/LaunchDaemons/com.rileytestut.altdaemon.plist

@@ -14,8 +14,13 @@
 	<key>UserName</key>
 	<string>mobile</string>
 	<key>KeepAlive</key>
-    <true/>
+	<false/>
 	<key>RunAtLoad</key>
-    <true/>
+	<false/>
+	<key>MachServices</key>
+	<dict>
+		<key>cy:io.altstore.altdaemon</key>
+		<true/>
+	</dict>
 </dict>
 </plist>

AltStore.xcodeproj/project.pbxproj

@@ -29,6 +29,8 @@
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 		BF18BFFD2485A1E400DD5981 /* WiredConnectionHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF18BFFC2485A1E400DD5981 /* WiredConnectionHandler.swift */; };
 		BF1E312B229F474900370A3C /* RequestHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF1E3129229F474900370A3C /* RequestHandler.swift */; };
+		BF1FE358251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF1FE357251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift */; };
+		BF1FE359251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF1FE357251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift */; };
 		BF29012F2318F6B100D88A45 /* AppBannerView.xib in Resources */ = {isa = PBXBuildFile; fileRef = BF29012E2318F6B100D88A45 /* AppBannerView.xib */; };
 		BF2901312318F7A800D88A45 /* AppBannerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF2901302318F7A800D88A45 /* AppBannerView.swift */; };
 		BF340E9A250AD39500A192CB /* ViewApp.intentdefinition in Sources */ = {isa = PBXBuildFile; fileRef = BF989191250AAE86002ACF50 /* ViewApp.intentdefinition */; };
@@ -190,7 +192,7 @@
 		BF8B17EB250AC40000F8157F /* FileManager+SharedDirectories.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6A531F246DC1B0004F59C8 /* FileManager+SharedDirectories.swift */; };
 		BF8CAE452489E772004D6CCE /* AnisetteDataManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8CAE422489E772004D6CCE /* AnisetteDataManager.swift */; };
 		BF8CAE462489E772004D6CCE /* AppManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8CAE432489E772004D6CCE /* AppManager.swift */; };
-		BF8CAE472489E772004D6CCE /* RequestHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8CAE442489E772004D6CCE /* RequestHandler.swift */; };
+		BF8CAE472489E772004D6CCE /* DaemonRequestHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8CAE442489E772004D6CCE /* DaemonRequestHandler.swift */; };
 		BF8CAE4C2489F637004D6CCE /* AltDaemon.deb in Resources */ = {isa = PBXBuildFile; fileRef = BF8CAE4A2489F5A0004D6CCE /* AltDaemon.deb */; };
 		BF8CAE4E248AEABA004D6CCE /* UIDevice+Jailbreak.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8CAE4D248AEABA004D6CCE /* UIDevice+Jailbreak.swift */; };
 		BF8F69C222E659F700049BA1 /* AppContentViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8F69C122E659F700049BA1 /* AppContentViewController.swift */; };
@@ -235,6 +237,9 @@
 		BFC57A652416C72400EB891E /* DeactivateAppOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFC57A642416C72400EB891E /* DeactivateAppOperation.swift */; };
 		BFC57A6E2416FC5D00EB891E /* InstalledAppsCollectionHeaderView.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFC57A6D2416FC5D00EB891E /* InstalledAppsCollectionHeaderView.swift */; };
 		BFC57A702416FC7600EB891E /* InstalledAppsCollectionHeaderView.xib in Resources */ = {isa = PBXBuildFile; fileRef = BFC57A6F2416FC7600EB891E /* InstalledAppsCollectionHeaderView.xib */; };
+		BFC712C32512D5F100AB5EBE /* XPCConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFC712C12512D5F100AB5EBE /* XPCConnection.swift */; };
+		BFC712C42512D5F100AB5EBE /* XPCConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFC712C12512D5F100AB5EBE /* XPCConnection.swift */; };
+		BFC712C52512D5F100AB5EBE /* XPCConnectionHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFC712C22512D5F100AB5EBE /* XPCConnectionHandler.swift */; };
 		BFC84A4D2421A19100853474 /* SourcesViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFC84A4C2421A19100853474 /* SourcesViewController.swift */; };
 		BFCB9207250AB2120057B44E /* Colors.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = BFCB9206250AB2120057B44E /* Colors.xcassets */; };
 		BFCCB51A245E3401001853EA /* VerifyAppOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFCCB519245E3401001853EA /* VerifyAppOperation.swift */; };
@@ -307,7 +312,6 @@
 		BFECAC8924FD950E0077C41F /* ConnectionManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF18BFF22485828200DD5981 /* ConnectionManager.swift */; };
 		BFECAC8A24FD950E0077C41F /* ALTServerError+Conveniences.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFF767CB2489AB5C0097E58C /* ALTServerError+Conveniences.swift */; };
 		BFECAC8B24FD950E0077C41F /* ServerProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF1E3128229F474900370A3C /* ServerProtocol.swift */; };
-		BFECAC8C24FD950E0077C41F /* NetworkConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFF767CD2489ABE90097E58C /* NetworkConnection.swift */; };
 		BFECAC8D24FD950E0077C41F /* ALTConstants.m in Sources */ = {isa = PBXBuildFile; fileRef = BF718BD723C93DB700A89F2D /* ALTConstants.m */; };
 		BFECAC8E24FD950E0077C41F /* Connection.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF18BFF624858BDE00DD5981 /* Connection.swift */; };
 		BFECAC8F24FD950E0077C41F /* Result+Conveniences.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFBAC8852295C90300587369 /* Result+Conveniences.swift */; };
@@ -328,7 +332,6 @@
 		BFF0B69A2322D7D0007A79E1 /* UIScreen+CompactHeight.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFF0B6992322D7D0007A79E1 /* UIScreen+CompactHeight.swift */; };
 		BFF615A82510042B00484D3B /* AltStoreCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = BF66EE7E2501AE50007EE018 /* AltStoreCore.framework */; };
 		BFF767C82489A74E0097E58C /* WirelessConnectionHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFF767C72489A74E0097E58C /* WirelessConnectionHandler.swift */; };
-		BFFCFA582488648D0077BFCE /* LocalConnectionHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF10EB3124870B3F0055E6DB /* LocalConnectionHandler.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -432,7 +435,6 @@
 		BF088D322501A4FF008082D9 /* OpenSSL.xcframework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcframework; name = OpenSSL.xcframework; path = Dependencies/AltSign/Dependencies/OpenSSL/Frameworks/OpenSSL.xcframework; sourceTree = "<group>"; };
 		BF0C4EBC22A1BD8B009A2DD7 /* AppManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppManager.swift; sourceTree = "<group>"; };
 		BF0DCA652433BDF500E3A595 /* AnalyticsManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnalyticsManager.swift; sourceTree = "<group>"; };
-		BF10EB3124870B3F0055E6DB /* LocalConnectionHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalConnectionHandler.swift; sourceTree = "<group>"; };
 		BF10EB33248730750055E6DB /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
 		BF18B0F022E25DF9005C4CF5 /* ToastView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ToastView.swift; sourceTree = "<group>"; };
 		BF18BFE724857D7900DD5981 /* AltDaemon */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = AltDaemon; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -447,6 +449,7 @@
 		BF1E314722A060F300370A3C /* AltStore-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "AltStore-Bridging-Header.h"; sourceTree = "<group>"; };
 		BF1E314822A060F400370A3C /* NSError+ALTServerError.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "NSError+ALTServerError.h"; sourceTree = "<group>"; };
 		BF1E314922A060F400370A3C /* NSError+ALTServerError.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = "NSError+ALTServerError.m"; sourceTree = "<group>"; };
+		BF1FE357251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "NSXPCConnection+MachServices.swift"; sourceTree = "<group>"; };
 		BF219A7E22CAC431007676A6 /* AltStore.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = AltStore.entitlements; sourceTree = "<group>"; };
 		BF29012E2318F6B100D88A45 /* AppBannerView.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = AppBannerView.xib; sourceTree = "<group>"; };
 		BF2901302318F7A800D88A45 /* AppBannerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppBannerView.swift; sourceTree = "<group>"; };
@@ -630,7 +633,7 @@
 		BF8B17F0250AC62400F8157F /* AltWidgetExtension.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = AltWidgetExtension.entitlements; sourceTree = "<group>"; };
 		BF8CAE422489E772004D6CCE /* AnisetteDataManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AnisetteDataManager.swift; sourceTree = "<group>"; };
 		BF8CAE432489E772004D6CCE /* AppManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppManager.swift; sourceTree = "<group>"; };
-		BF8CAE442489E772004D6CCE /* RequestHandler.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RequestHandler.swift; sourceTree = "<group>"; };
+		BF8CAE442489E772004D6CCE /* DaemonRequestHandler.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DaemonRequestHandler.swift; sourceTree = "<group>"; };
 		BF8CAE4A2489F5A0004D6CCE /* AltDaemon.deb */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; path = AltDaemon.deb; sourceTree = "<group>"; };
 		BF8CAE4D248AEABA004D6CCE /* UIDevice+Jailbreak.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIDevice+Jailbreak.swift"; sourceTree = "<group>"; };
 		BF8F69C122E659F700049BA1 /* AppContentViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppContentViewController.swift; sourceTree = "<group>"; };
@@ -662,6 +665,8 @@
 		BFC57A642416C72400EB891E /* DeactivateAppOperation.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DeactivateAppOperation.swift; sourceTree = "<group>"; };
 		BFC57A6D2416FC5D00EB891E /* InstalledAppsCollectionHeaderView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InstalledAppsCollectionHeaderView.swift; sourceTree = "<group>"; };
 		BFC57A6F2416FC7600EB891E /* InstalledAppsCollectionHeaderView.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = InstalledAppsCollectionHeaderView.xib; sourceTree = "<group>"; };
+		BFC712C12512D5F100AB5EBE /* XPCConnection.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = XPCConnection.swift; sourceTree = "<group>"; };
+		BFC712C22512D5F100AB5EBE /* XPCConnectionHandler.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = XPCConnectionHandler.swift; sourceTree = "<group>"; };
 		BFC84A4C2421A19100853474 /* SourcesViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SourcesViewController.swift; sourceTree = "<group>"; };
 		BFCB9206250AB2120057B44E /* Colors.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Colors.xcassets; sourceTree = "<group>"; };
 		BFCCB519245E3401001853EA /* VerifyAppOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VerifyAppOperation.swift; sourceTree = "<group>"; };
@@ -858,8 +863,8 @@
 			children = (
 				BFFCFA45248835530077BFCE /* AltDaemon.entitlements */,
 				BF10EB33248730750055E6DB /* main.swift */,
-				BF8CAE442489E772004D6CCE /* RequestHandler.swift */,
-				BF10EB3124870B3F0055E6DB /* LocalConnectionHandler.swift */,
+				BFC712C22512D5F100AB5EBE /* XPCConnectionHandler.swift */,
+				BF8CAE442489E772004D6CCE /* DaemonRequestHandler.swift */,
 				BF8CAE422489E772004D6CCE /* AnisetteDataManager.swift */,
 				BF8CAE432489E772004D6CCE /* AppManager.swift */,
 				BF18C0032485B4DE00DD5981 /* AltDaemon-Bridging-Header.h */,
@@ -1580,6 +1585,7 @@
 				BFBAC8852295C90300587369 /* Result+Conveniences.swift */,
 				BF1E314122A05D4C00370A3C /* Bundle+AltStore.swift */,
 				BFF767CB2489AB5C0097E58C /* ALTServerError+Conveniences.swift */,
+				BF1FE357251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -1602,6 +1608,7 @@
 				BF18BFFE2485A42800DD5981 /* ALTConnection.h */,
 				BF18BFF624858BDE00DD5981 /* Connection.swift */,
 				BFF767CD2489ABE90097E58C /* NetworkConnection.swift */,
+				BFC712C12512D5F100AB5EBE /* XPCConnection.swift */,
 			);
 			path = Connections;
 			sourceTree = "<group>";
@@ -2126,10 +2133,12 @@
 			buildActionMask = 2147483647;
 			files = (
 				BF8CAE452489E772004D6CCE /* AnisetteDataManager.swift in Sources */,
+				BF1FE358251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift in Sources */,
 				BFECAC8F24FD950E0077C41F /* Result+Conveniences.swift in Sources */,
-				BF8CAE472489E772004D6CCE /* RequestHandler.swift in Sources */,
-				BFECAC8C24FD950E0077C41F /* NetworkConnection.swift in Sources */,
+				BF8CAE472489E772004D6CCE /* DaemonRequestHandler.swift in Sources */,
 				BFECAC8824FD950E0077C41F /* CodableServerError.swift in Sources */,
+				BFC712C32512D5F100AB5EBE /* XPCConnection.swift in Sources */,
+				BFC712C52512D5F100AB5EBE /* XPCConnectionHandler.swift in Sources */,
 				BFECAC8A24FD950E0077C41F /* ALTServerError+Conveniences.swift in Sources */,
 				BFECAC8D24FD950E0077C41F /* ALTConstants.m in Sources */,
 				BFECAC8924FD950E0077C41F /* ConnectionManager.swift in Sources */,
@@ -2138,7 +2147,6 @@
 				BFECAC8B24FD950E0077C41F /* ServerProtocol.swift in Sources */,
 				BFECAC9624FD98BB0077C41F /* NSError+ALTServerError.m in Sources */,
 				BF10EB34248730750055E6DB /* main.swift in Sources */,
-				BFFCFA582488648D0077BFCE /* LocalConnectionHandler.swift in Sources */,
 				BF8CAE462489E772004D6CCE /* AppManager.swift in Sources */,
 				BFECAC9024FD950E0077C41F /* Bundle+AltStore.swift in Sources */,
 			);
@@ -2271,6 +2279,7 @@
 				BFAECC532501B0A400528F27 /* ServerProtocol.swift in Sources */,
 				BFAECC572501B0A400528F27 /* ConnectionManager.swift in Sources */,
 				BF66EE9D2501AEC1007EE018 /* AppProtocol.swift in Sources */,
+				BFC712C42512D5F100AB5EBE /* XPCConnection.swift in Sources */,
 				BF66EE8C2501AEB2007EE018 /* Keychain.swift in Sources */,
 				BF66EED42501AECA007EE018 /* AltStore5ToAltStore6.xcmappingmodel in Sources */,
 				BF66EE972501AEBC007EE018 /* ALTAppPermission.m in Sources */,
@@ -2303,6 +2312,7 @@
 				BF66EECC2501AECA007EE018 /* Source.swift in Sources */,
 				BF66EED72501AECA007EE018 /* InstalledApp.swift in Sources */,
 				BF66EECE2501AECA007EE018 /* InstalledAppPolicy.swift in Sources */,
+				BF1FE359251A9FB000C3CE09 /* NSXPCConnection+MachServices.swift in Sources */,
 				BF66EEA62501AEC5007EE018 /* PatreonAPI.swift in Sources */,
 				BF66EED02501AECA007EE018 /* AltStore6ToAltStore7.xcmappingmodel in Sources */,
 				BF66EEDC2501AECA007EE018 /* MergePolicy.swift in Sources */,

AltStore/Operations/FindServerOperation.swift

@@ -8,6 +8,7 @@
 
 import Foundation
 
+import AltStoreCore
 import Roxas
 
 private let ReceivedServerConnectionResponse: @convention(c) (CFNotificationCenter?, UnsafeMutableRawPointer?, CFNotificationName?, UnsafeRawPointer?, CFDictionary?) -> Void =
@@ -52,11 +53,11 @@ class FindServerOperation: ResultOperation<Server>
         
         // Prepare observers to receive callback from wired connection or background daemon (if available).
         CFNotificationCenterAddObserver(notificationCenter, observer, ReceivedServerConnectionResponse, CFNotificationName.wiredServerConnectionAvailableResponse.rawValue, nil, .deliverImmediately)
-        CFNotificationCenterAddObserver(notificationCenter, observer, ReceivedServerConnectionResponse, CFNotificationName.localServerConnectionAvailableResponse.rawValue, nil, .deliverImmediately)
         
         // Post notifications.
         CFNotificationCenterPostNotification(notificationCenter, .wiredServerConnectionAvailableRequest, nil, nil, true)
-        CFNotificationCenterPostNotification(notificationCenter, .localServerConnectionAvailableRequest, nil, nil, true)
+        
+        self.discoverLocalServer()
         
         // Wait for either callback or timeout.
         DispatchQueue.global().asyncAfter(deadline: .now() + 1.0) {
@@ -97,18 +98,28 @@ class FindServerOperation: ResultOperation<Server>
         let observer = Unmanaged.passUnretained(self).toOpaque()
         
         CFNotificationCenterRemoveObserver(notificationCenter, observer, .wiredServerConnectionAvailableResponse, nil)
-        CFNotificationCenterRemoveObserver(notificationCenter, observer, .localServerConnectionAvailableResponse, nil)
     }
 }
 
 fileprivate extension FindServerOperation
 {
+    func discoverLocalServer()
+    {
+        let connection = XPCConnection()
+        connection.connect { (result) in
+            switch result
+            {
+            case .failure(let error): print("Could not connect to AltDaemon XPC service.", error)
+            case .success: self.isLocalServerConnectionAvailable = true
+            }
+        }
+    }
+    
     func handle(_ notification: CFNotificationName)
     {
         switch notification
         {
         case .wiredServerConnectionAvailableResponse: self.isWiredServerConnectionAvailable = true
-        case .localServerConnectionAvailableResponse: self.isLocalServerConnectionAvailable = true
         default: break
         }
     }

AltStore/Server/ServerConnection.swift

@@ -14,9 +14,9 @@ import AltStoreCore
 class ServerConnection
 {
     var server: Server
-    var connection: NWConnection
+    var connection: Connection
     
-    init(server: Server, connection: NWConnection)
+    init(server: Server, connection: Connection)
     {
         self.server = server
         self.connection = connection
@@ -37,17 +37,15 @@ class ServerConnection
                 data = try JSONEncoder().encode(payload)
             }
             
-            func process(_ error: Error?) -> Bool
+            func process<T>(_ result: Result<T, ALTServerError>) -> Bool
             {
-                if error != nil
+                switch result
                 {
-                    completionHandler(.failure(ConnectionError.connectionDropped))
+                case .success: return true
+                case .failure(let error):
+                    completionHandler(.failure(error))
                     return false
                 }
-                else
-                {
-                    return true
-                }
             }
             
             if prependSize
@@ -55,22 +53,21 @@ class ServerConnection
                 let requestSize = Int32(data.count)
                 let requestSizeData = withUnsafeBytes(of: requestSize) { Data($0) }
                 
-                self.connection.send(content: requestSizeData, completion: .contentProcessed { (error) in
-                    guard process(error) else { return }
+                self.connection.send(requestSizeData) { (result) in
+                    guard process(result) else { return }
                     
-                    self.connection.send(content: data, completion: .contentProcessed { (error) in
-                        guard process(error) else { return }
+                    self.connection.send(data) { (result) in
+                        guard process(result) else { return }
                         completionHandler(.success(()))
-                    })
-                })
-                
+                    }
+                }
             }
             else
             {
-                connection.send(content: data, completion: .contentProcessed { (error) in
-                    guard process(error) else { return }
+                self.connection.send(data) { (result) in
+                    guard process(result) else { return }
                     completionHandler(.success(()))
-                })
+                }
             }
         }
         catch
@@ -84,16 +81,16 @@ class ServerConnection
     {
         let size = MemoryLayout<Int32>.size
         
-        self.connection.receive(minimumIncompleteLength: size, maximumLength: size) { (data, _, _, error) in
+        self.connection.receiveData(expectedSize: size) { (result) in
             do
             {
-                let data = try self.process(data: data, error: error)
+                let data = try result.get()
                 
                 let expectedBytes = Int(data.withUnsafeBytes { $0.load(as: Int32.self) })
-                self.connection.receive(minimumIncompleteLength: expectedBytes, maximumLength: expectedBytes) { (data, _, _, error) in
+                self.connection.receiveData(expectedSize: expectedBytes) { (result) in
                     do
                     {
-                        let data = try self.process(data: data, error: error)
+                        let data = try result.get()
                         
                         let response = try AltStoreCore.JSONDecoder().decode(ServerResponse.self, from: data)
                         completionHandler(.success(response))
@@ -111,36 +108,3 @@ class ServerConnection
         }
     }
 }
-
-private extension ServerConnection
-{
-    func process(data: Data?, error: NWError?) throws -> Data
-    {
-        do
-        {
-            do
-            {
-                guard let data = data else { throw error ?? ALTServerError(.unknown) }
-                return data
-            }
-            catch let error as NWError
-            {
-                print("Error receiving data from connection \(connection)", error)
-                
-                throw ALTServerError(.lostConnection)
-            }
-            catch
-            {
-                throw error
-            }
-        }
-        catch let error as ALTServerError
-        {
-            throw error
-        }
-        catch
-        {
-            preconditionFailure("A non-ALTServerError should never be thrown from this method.")
-        }
-    }
-}

AltStore/Server/ServerManager.swift

@@ -63,39 +63,23 @@ extension ServerManager
     func connect(to server: Server, completion: @escaping (Result<ServerConnection, Error>) -> Void)
     {
         DispatchQueue.global().async {
-            func finish(_ result: Result<ServerConnection, Error>)
+            func finish(_ result: Result<Connection, Error>)
             {
-                completion(result)
-            }
-            
-            func start(_ connection: NWConnection)
-            {
-                connection.stateUpdateHandler = { [unowned connection] (state) in
-                    switch state
-                    {
-                    case .failed(let error):
-                        print("Failed to connect to service \(server.service?.name ?? "").", error)
-                        finish(.failure(ConnectionError.connectionFailed))
-                        
-                    case .cancelled:
-                        finish(.failure(OperationError.cancelled))
-                        
-                    case .ready:
-                        let connection = ServerConnection(server: server, connection: connection)
-                        finish(.success(connection))
-                        
-                    case .waiting: break
-                    case .setup: break
-                    case .preparing: break
-                    @unknown default: break
-                    }
+                switch result
+                {
+                case .failure(let error): completion(.failure(error))
+                case .success(let connection):
+                    let serverConnection = ServerConnection(server: server, connection: connection)
+                    completion(.success(serverConnection))
                 }
-                
-                connection.start(queue: self.dispatchQueue)
             }
             
-            if let incomingConnectionsSemaphore = self.incomingConnectionsSemaphore, server.connectionType != .wireless
+            switch server.connectionType
             {
+            case .local: self.connectToLocalServer(completion: finish(_:))
+            case .wired:
+                guard let incomingConnectionsSemaphore = self.incomingConnectionsSemaphore else { return finish(.failure(ALTServerError(.connectionFailed))) }
+                
                 print("Waiting for incoming connection...")
                 
                 let notificationCenter = CFNotificationCenterGetDarwinNotifyCenter()
@@ -103,39 +87,27 @@ extension ServerManager
                 switch server.connectionType
                 {
                 case .wired: CFNotificationCenterPostNotification(notificationCenter, .wiredServerConnectionStartRequest, nil, nil, true)
-                case .local: CFNotificationCenterPostNotification(notificationCenter, .localServerConnectionStartRequest, nil, nil, true)
-                case .wireless: break
+                case .local, .wireless: break
                 }
                 
                 _ = incomingConnectionsSemaphore.wait(timeout: .now() + 10.0)
                 
                 if let connection = self.incomingConnections?.popLast()
                 {
-                    start(connection)
+                    self.connectToRemoteServer(server, connection: connection, completion: finish(_:))
                 }
                 else
                 {
                     finish(.failure(ALTServerError(.connectionFailed)))
                 }
-            }
-            else if let service = server.service
-            {
+                
+            case .wireless:
+                guard let service = server.service else { return finish(.failure(ALTServerError(.connectionFailed))) }
+                
                 print("Connecting to service:", service)
                 
-                let parameters = NWParameters.tcp
-                
-                if server.connectionType == .local
-                {
-                    // Prevent AltStore from initiating connections over multiple interfaces simultaneously 🤷‍♂️
-                    parameters.requiredInterfaceType = .loopback
-                }
-                
-                let connection = NWConnection(to: .service(name: service.name, type: service.type, domain: service.domain, interface: nil), using: parameters)
-                start(connection)
-            }
-            else
-            {
-                finish(.failure(ALTServerError(.connectionFailed)))
+                let connection = NWConnection(to: .service(name: service.name, type: service.type, domain: service.domain, interface: nil), using: .tcp)
+                self.connectToRemoteServer(server, connection: connection, completion: finish(_:))
             }
         }
     }
@@ -191,6 +163,47 @@ private extension ServerManager
         self.incomingConnections = nil
         self.incomingConnectionsSemaphore = nil
     }
+    
+    func connectToRemoteServer(_ server: Server, connection: NWConnection, completion: @escaping (Result<Connection, Error>) -> Void)
+    {
+        connection.stateUpdateHandler = { [unowned connection] (state) in
+            switch state
+            {
+            case .failed(let error):
+                print("Failed to connect to service \(server.service?.name ?? "").", error)
+                completion(.failure(ConnectionError.connectionFailed))
+                
+            case .cancelled:
+                completion(.failure(OperationError.cancelled))
+                
+            case .ready:
+                let connection = NetworkConnection(connection)
+                completion(.success(connection))
+                
+            case .waiting: break
+            case .setup: break
+            case .preparing: break
+            @unknown default: break
+            }
+        }
+        
+        connection.start(queue: self.dispatchQueue)
+    }
+    
+    func connectToLocalServer(completion: @escaping (Result<Connection, Error>) -> Void)
+    {
+        let connection = XPCConnection()
+        connection.connect { (result) in
+            switch result
+            {
+            case .failure(let error):
+                print("Could not connect to AltDaemon XPC service.", error)
+                completion(.failure(error))
+                
+            case .success: completion(.success(connection))
+            }
+        }
+    }
 }
 
 extension ServerManager: NetServiceBrowserDelegate

Shared/Categories/CFNotificationName+AltStore.h

@@ -14,8 +14,4 @@ extern CFNotificationName const ALTWiredServerConnectionAvailableRequest NS_SWIF
 extern CFNotificationName const ALTWiredServerConnectionAvailableResponse NS_SWIFT_NAME(wiredServerConnectionAvailableResponse);
 extern CFNotificationName const ALTWiredServerConnectionStartRequest NS_SWIFT_NAME(wiredServerConnectionStartRequest);
 
-extern CFNotificationName const ALTLocalServerConnectionAvailableRequest NS_SWIFT_NAME(localServerConnectionAvailableRequest);
-extern CFNotificationName const ALTLocalServerConnectionAvailableResponse NS_SWIFT_NAME(localServerConnectionAvailableResponse);
-extern CFNotificationName const ALTLocalServerConnectionStartRequest NS_SWIFT_NAME(localServerConnectionStartRequest);
-
 NS_ASSUME_NONNULL_END

Shared/Categories/CFNotificationName+AltStore.m

@@ -11,7 +11,3 @@
 CFNotificationName const ALTWiredServerConnectionAvailableRequest = CFSTR("io.altstore.Request.WiredServerConnectionAvailable");
 CFNotificationName const ALTWiredServerConnectionAvailableResponse = CFSTR("io.altstore.Response.WiredServerConnectionAvailable");
 CFNotificationName const ALTWiredServerConnectionStartRequest = CFSTR("io.altstore.Request.WiredServerConnectionStart");
-
-CFNotificationName const ALTLocalServerConnectionAvailableRequest = CFSTR("io.altstore.Request.LocalServerConnectionAvailable");
-CFNotificationName const ALTLocalServerConnectionAvailableResponse = CFSTR("io.altstore.Response.LocalServerConnectionAvailable");
-CFNotificationName const ALTLocalServerConnectionStartRequest = CFSTR("io.altstore.Request.LocalServerConnectionStart");

Shared/Connections/XPCConnection.swift

@@ -0,0 +1,150 @@
+//
+//  XPCConnection.swift
+//  AltKit
+//
+//  Created by Riley Testut on 6/15/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+@objc private protocol XPCConnectionProxy
+{
+    func ping(completionHandler: @escaping () -> Void)
+    func receive(_ data: Data, completionHandler: @escaping (Bool, Error?) -> Void)
+}
+
+extension XPCConnection
+{
+    public static let machServiceName = "cy:io.altstore.altdaemon"
+}
+
+public class XPCConnection: NSObject, Connection
+{
+    public let xpcConnection: NSXPCConnection
+    
+    private let queue = DispatchQueue(label: "io.altstore.XPCConnection")
+    private let dispatchGroup = DispatchGroup()
+    private var semaphore: DispatchSemaphore?
+    private var buffer = Data(capacity: 1024)
+    
+    private var error: Error?
+    
+    public init(_ xpcConnection: NSXPCConnection = .makeConnection(machServiceName: XPCConnection.machServiceName))
+    {
+        let proxyInterface = NSXPCInterface(with: XPCConnectionProxy.self)
+        xpcConnection.remoteObjectInterface = proxyInterface
+        xpcConnection.exportedInterface = proxyInterface
+
+        self.xpcConnection = xpcConnection
+        
+        super.init()
+        
+        xpcConnection.interruptionHandler = {
+            self.error = ALTServerError(.lostConnection)
+        }
+                
+        xpcConnection.exportedObject = self
+        xpcConnection.resume()
+    }
+
+    deinit
+    {
+        self.disconnect()
+    }
+}
+
+private extension XPCConnection
+{
+    func makeProxy(errorHandler: @escaping (Error) -> Void) -> XPCConnectionProxy
+    {
+        let proxy = self.xpcConnection.remoteObjectProxyWithErrorHandler { (error) in
+            print("Error messaging remote object proxy:", error)
+            self.error = error
+            errorHandler(error)
+        } as! XPCConnectionProxy
+        
+        return proxy
+    }
+}
+
+public extension XPCConnection
+{
+    func connect(completionHandler: @escaping (Result<Void, Error>) -> Void)
+    {
+        let proxy = self.makeProxy { (error) in
+            completionHandler(.failure(error))
+        }
+
+        proxy.ping {
+            completionHandler(.success(()))
+        }
+    }
+    
+    func disconnect()
+    {
+        self.xpcConnection.invalidate()
+    }
+    
+    func __send(_ data: Data, completionHandler: @escaping (Bool, Error?) -> Void)
+    {
+        guard self.error == nil else { return completionHandler(false, self.error) }
+        
+        let proxy = self.makeProxy { (error) in
+            completionHandler(false, error)
+        }
+        
+        proxy.receive(data) { (success, error) in
+            completionHandler(success, error)
+        }
+    }
+    
+    func __receiveData(expectedSize: Int, completionHandler: @escaping (Data?, Error?) -> Void)
+    {
+        guard self.error == nil else { return completionHandler(nil, self.error) }
+        
+        self.queue.async {
+            let copiedBuffer = self.buffer // Copy buffer to prevent runtime crashes.
+            guard copiedBuffer.count >= expectedSize else {
+                self.semaphore = DispatchSemaphore(value: 0)
+                DispatchQueue.global().async {
+                    _ = self.semaphore?.wait(timeout: .now() + 1.0)
+                    self.__receiveData(expectedSize: expectedSize, completionHandler: completionHandler)
+                }
+                return
+            }
+            
+            let data = copiedBuffer.prefix(expectedSize)
+            self.buffer = copiedBuffer.dropFirst(expectedSize)
+            
+            completionHandler(data, nil)
+        }
+    }
+}
+
+extension XPCConnection
+{
+    override public var description: String {
+        return "\(self.xpcConnection.endpoint) (XPC)"
+    }
+}
+
+extension XPCConnection: XPCConnectionProxy
+{
+    fileprivate func ping(completionHandler: @escaping () -> Void)
+    {
+        completionHandler()
+    }
+    
+    fileprivate func receive(_ data: Data, completionHandler: @escaping (Bool, Error?) -> Void)
+    {
+        self.queue.async {
+            self.buffer.append(data)
+            
+            self.semaphore?.signal()
+            self.semaphore = nil
+            
+            completionHandler(true, nil)
+        }
+    }
+}

Shared/Extensions/NSXPCConnection+MachServices.swift

@@ -0,0 +1,33 @@
+//
+//  NSXPCConnection+MachServices.swift
+//  AltStore
+//
+//  Created by Riley Testut on 9/22/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+@objc private protocol XPCPrivateAPI
+{
+    init(machServiceName: String)
+    init(machServiceName: String, options: NSXPCConnection.Options)
+}
+
+public extension NSXPCConnection
+{
+    class func makeConnection(machServiceName: String) -> NSXPCConnection
+    {
+        let connection = unsafeBitCast(self, to: XPCPrivateAPI.Type.self).init(machServiceName: machServiceName, options: .privileged)
+        return unsafeBitCast(connection, to: NSXPCConnection.self)
+    }
+}
+
+public extension NSXPCListener
+{
+    class func makeListener(machServiceName: String) -> NSXPCListener
+    {
+        let listener = unsafeBitCast(self, to: XPCPrivateAPI.Type.self).init(machServiceName: machServiceName)
+        return unsafeBitCast(listener, to: NSXPCListener.self)
+    }
+}