I am new to Swift, and I am fetching a VPN certificate from a database to create a tunnel.
The problem is that the variable that should contain the certificate (as Data type) is calling a function that is fetching the certificate, but the certificate takes time to appear, so the variable is empty and sent to the VPN configuration, so the VPN won't work.
The certificate appears later on.
I am not really good at solving these kinds of issues,
I tried to make a delay in the function that is fetching my certificate, but the problem is still present (I know that it's a bad method because network speed may vary and I cannot control the time)
Can you please help me?
func getCertificate() -> Data? {
self.loading.onNext(true)
var configData:String = ""
Services.getCert(authToken: UserManager.currentUser?.token ?? "", method: vpnMethod, userID: String(UserManager.currentUser?.user_id ?? 0)) { (error, VpnModel, Int) in
self.loading.onNext(false)
if error == nil{
if VpnModel?.cert_body == nil{
configData = ""
}else{
configData = VpnModel?.cert_body ?? ""
}
}
}
let configurationData = Data(configData.utf8)
print(String(decoding: configurationData, as: UTF8.self))
return configurationData
}
You need a completion as Services.getCert(...... is asynchronous
func getCertificate(completion:#escaping (Data? ->())) {
self.loading.onNext(true)
var configData:String = ""
Services.getCert(authToken: UserManager.currentUser?.token ?? "", method: vpnMethod, userID: String(UserManager.currentUser?.user_id ?? 0)) { (error, VpnModel, Int) in
self.loading.onNext(false)
if error == nil{
if VpnModel?.cert_body == nil{
configData = ""
}else{
configData = VpnModel?.cert_body ?? ""
}
let configurationData = Data(configData.utf8)
print(String(decoding: configurationData, as: UTF8.self))
completion(configurationData)
}
}
}
To call
getCertificate { res in
print(res)
}
Related
I am currently building an app with an account system.
Firebase is very new to me, that's why I watched a lot of tutorials, and now its working fine.
I want to implement that the user can choose a unique username at the registration. My problem is, I really don't know how to check if this name is already taken.
I found some code for that, but that's not working, I will show you the code for the RegistrationService file.
I hope someone can explain to me how to implement this username verification. It should return an error if the username is already taken and do continue the registration if its a valid username.
Thank you!
import Combine
import Firebase
import FirebaseDatabase
import Foundation
enum RegistrationKeys: String {
case firstName
case lastname
case info
case username
}
protocol RegisterService {
func register(with details: RegistrationDetails) -> AnyPublisher<Void, Error>
}
final class RegisterServiceImpl: RegisterService {
func register(with details: RegistrationDetails) -> AnyPublisher<Void, Error> {
Deferred {
Future { promise in
Auth.auth()
.createUser(
withEmail: details.email,
password: details.password
) { res, error in
if let err = error {
promise(.failure(err))
} else {
// Success on User creation
if let uid = res?.user.uid {
let values =
[
RegistrationKeys.firstName.rawValue: details.firstName,
RegistrationKeys.lastname.rawValue: details.lastName,
RegistrationKeys.info.rawValue: details.info,
] as [String: Any]
let db = Database.database(url: "theurl")
Database.database(url: "the url")
.reference()
.child("usernames")
.child("\([RegistrationKeys.info.rawValue: details.username] as [String : Any])")
// here should be the check and then continue if its valid
db
.reference()
.child("users")
.child(uid)
.updateChildValues(values) { error, ref in
if let err = error {
promise(.failure(err))
} else {
promise(.success(()))
}
}
} else {
promise(.failure(NSError(domain: "Invalid user ID", code: 0, userInfo: nil)))
}
}
}
}
}
.receive(on: RunLoop.main)
.eraseToAnyPublisher()
}
}
I can see two possibilities to solve your problem:
If the e-mail can serve as the username
Firebase authentication already sends back an error message in case the e-mail (the one used when creating the user) already exists. If the e-mail passed in the following function is not unique, an error will be thrown:
Auth.auth()
.createUser(
withEmail: details.email,
password: details.password
) { res, error in
if let err = error {
promise(.failure(err))
If an additional username besides the e-mail is required
If you need usernames in addition to the e-mails, you can store them under a node "usernames", like we see in your example. Personally, I would hash them instead of storing them plain.
The structure could simply be:
{
usernames: {
username_1: true,
username_2: true,
...
username_n: true
}
}
The example below checks to see if a new username exists and stores the result in the variable isUsernameTaken:
let db = Database.database(url: "the url").reference()
let newUsername = "seeIfItIsTaken"
db.child("usernames").child(newUsername).getData() { error, snapshot in
guard error == nil else {
print("Found error \(error)")
return
}
let isUsernameTaken = snapshot.exists()
}
I am making an app that activates a VPN connection based on OpenVPN, retrieves a certificate from the database, and opens a tunnel using NEPacketTunnelProvider and NetworkExtension.
I used the following repository, and now my VPN is working fine.
But the problem is that I want to allow only one app to use this VPN when enabled (WhatsApp precisely), and I want to restrict all other apps of using it.
On Android it's possible by giving the bundle identifier of the allowed apps to the PackageManager.
Can you please help me?
This is my PacketTunnelProvider class:
import NetworkExtension
import OpenVPNAdapter
extension NEPacketTunnelFlow: OpenVPNAdapterPacketFlow {}
class PacketTunnelProvider: NEPacketTunnelProvider {
lazy var vpnAdapter: OpenVPNAdapter = {
let adapter = OpenVPNAdapter()
adapter.delegate = self
return adapter
}()
let vpnReachability = OpenVPNReachability()
var startHandler: ((Error?) -> Void)?
var stopHandler: (() -> Void)?
override func startTunnel(options: [String : NSObject]?, completionHandler: #escaping (Error?) -> Void) {
// There are many ways to provide OpenVPN settings to the tunnel provider. For instance,
// you can use `options` argument of `startTunnel(options:completionHandler:)` method or get
// settings from `protocolConfiguration.providerConfiguration` property of `NEPacketTunnelProvider`
// class. Also you may provide just content of a ovpn file or use key:value pairs
// that may be provided exclusively or in addition to file content.
// In our case we need providerConfiguration dictionary to retrieve content
// of the OpenVPN configuration file. Other options related to the tunnel
// provider also can be stored there.
print("started!")
guard
let protocolConfiguration = protocolConfiguration as? NETunnelProviderProtocol,
let providerConfiguration = protocolConfiguration.providerConfiguration
else {
fatalError()
}
guard let ovpnFileContent: Data = providerConfiguration["ovpn"] as? Data else {
fatalError()
}
let configuration = OpenVPNConfiguration()
configuration.fileContent = ovpnFileContent
// configuration.settings = [
// // Additional parameters as key:value pairs may be provided here
// ]
// Uncomment this line if you want to keep TUN interface active during pauses or reconnections
// configuration.tunPersist = true
// Apply OpenVPN configuration
let evaluation: OpenVPNConfigurationEvaluation
do {
evaluation = try vpnAdapter.apply(configuration: configuration)
} catch {
completionHandler(error)
return
}
// Provide credentials if needed
if !evaluation.autologin {
// If your VPN configuration requires user credentials you can provide them by
// `protocolConfiguration.username` and `protocolConfiguration.passwordReference`
// properties. It is recommended to use persistent keychain reference to a keychain
// item containing the password.
guard let username: String = protocolConfiguration.username else {
fatalError()
}
// Retrieve a password from the keychain
// guard let password: String = ... {
// fatalError()
// }
let credentials = OpenVPNCredentials()
credentials.username = username
// credentials.password = password
do {
try vpnAdapter.provide(credentials: credentials)
} catch {
completionHandler(error)
return
}
}
// Checking reachability. In some cases after switching from cellular to
// WiFi the adapter still uses cellular data. Changing reachability forces
// reconnection so the adapter will use actual connection.
vpnReachability.startTracking { [weak self] status in
guard status == .reachableViaWiFi else { return }
self?.vpnAdapter.reconnect(afterTimeInterval: 5)
}
// Establish connection and wait for .connected event
startHandler = completionHandler
vpnAdapter.connect(using: packetFlow)
}
override func stopTunnel(with reason: NEProviderStopReason, completionHandler: #escaping () -> Void) {
stopHandler = completionHandler
if vpnReachability.isTracking {
vpnReachability.stopTracking()
}
vpnAdapter.disconnect()
}
}
extension PacketTunnelProvider: OpenVPNAdapterDelegate {
// OpenVPNAdapter calls this delegate method to configure a VPN tunnel.
// `completionHandler` callback requires an object conforming to `OpenVPNAdapterPacketFlow`
// protocol if the tunnel is configured without errors. Otherwise send nil.
// `OpenVPNAdapterPacketFlow` method signatures are similar to `NEPacketTunnelFlow` so
// you can just extend that class to adopt `OpenVPNAdapterPacketFlow` protocol and
// send `self.packetFlow` to `completionHandler` callback.
func openVPNAdapter(_ openVPNAdapter: OpenVPNAdapter, configureTunnelWithNetworkSettings networkSettings: NEPacketTunnelNetworkSettings?, completionHandler: #escaping (Error?) -> Void) {
// In order to direct all DNS queries first to the VPN DNS servers before the primary DNS servers
// send empty string to NEDNSSettings.matchDomains
networkSettings?.dnsSettings?.matchDomains = [""]
// Set the network settings for the current tunneling session.
setTunnelNetworkSettings(networkSettings, completionHandler: completionHandler)
}
// Process events returned by the OpenVPN library
func openVPNAdapter(_ openVPNAdapter: OpenVPNAdapter, handleEvent event: OpenVPNAdapterEvent, message: String?) {
switch event {
case .connected:
if reasserting {
reasserting = false
}
guard let startHandler = startHandler else { return }
startHandler(nil)
self.startHandler = nil
case .disconnected:
guard let stopHandler = stopHandler else { return }
if vpnReachability.isTracking {
vpnReachability.stopTracking()
}
stopHandler()
self.stopHandler = nil
case .reconnecting:
reasserting = true
default:
break
}
}
// Handle errors thrown by the OpenVPN library
func openVPNAdapter(_ openVPNAdapter: OpenVPNAdapter, handleError error: Error) {
// Handle only fatal errors
guard let fatal = (error as NSError).userInfo[OpenVPNAdapterErrorFatalKey] as? Bool, fatal == true else {
return
}
if vpnReachability.isTracking {
vpnReachability.stopTracking()
}
if let startHandler = startHandler {
startHandler(error)
self.startHandler = nil
} else {
cancelTunnelWithError(error)
}
}
// Use this method to process any log message returned by OpenVPN library.
func openVPNAdapter(_ openVPNAdapter: OpenVPNAdapter, handleLogMessage logMessage: String) {
// Handle log messages
print(logMessage)
}
}
This is the function used in my VPN View Model to start a tunnel:
func configureVPN(serverAddress: String, username: String, password: String) {
var configData:Data = Data.init()
self.getCertificate{certificate in
configData = certificate!
guard
//If we want to read from a file
// let configData = self.readFile(name: "vtest2"),
let providerManager = self.providerManager
else {
return
}
self.providerManager?.loadFromPreferences { error in
if error == nil {
let tunnelProtocol = NETunnelProviderProtocol()
tunnelProtocol.username = username
tunnelProtocol.serverAddress = serverAddress
tunnelProtocol.providerBundleIdentifier = self.providerId // bundle id of the network extension target
tunnelProtocol.providerConfiguration = ["ovpn": configData]
tunnelProtocol.disconnectOnSleep = false
providerManager.protocolConfiguration = tunnelProtocol
providerManager.localizedDescription = "Slyfone Guard" // the title of the VPN profile which will appear on Settings
providerManager.isEnabled = true
providerManager.saveToPreferences(completionHandler: { (error) in
if error == nil {
providerManager.loadFromPreferences(completionHandler: { (error) in
do {
try providerManager.connection.startVPNTunnel(options: nil) // starts the VPN tunnel.
} catch let error {
print(error.localizedDescription)
}
})
}
})
}
}
}
}
As an engineer from Apple said:
The way to do it is to use Per-App VPN. See the Per-App VPN On Demand section in the NETunnelProviderManager documentation.
With NEPacketTunnelProvider on macOS (as of 10.15.4) you can set this up yourself with NEAppRule. A very generic example of setting up Safari to trigger the VPN would be:
var perAppManager = NETunnelProviderManager.forPerAppVPN()
/* ... */
NETunnelProviderManager.forPerAppVPN().loadFromPreferences(completionHandler: { error in
precondition(Thread.isMainThread)
/* ... */
let proto = (perAppManager.protocolConfiguration as? NETunnelProviderProtocol) ?? NETunnelProviderProtocol()
proto.serverAddress = "server.vpn.com"
proto.providerBundleIdentifier = "com.perapp-vpn.macOSPacketTunnel.PacketTunnelTest"
var appRules = [NEAppRule]()
let appRule = NEAppRule(signingIdentifier: "com.apple.Safari", designatedRequirement: "identifier \"com.apple.Safari\" and anchor apple")
appRule.matchDomains = ["example.com"]
appRules.append(appRule)
perAppManager.appRules = appRules
perAppManager.isOnDemandEnabled = true
perAppManager.protocolConfiguration = proto
perAppManager.isEnabled = true
perAppManager.localizedDescription = "Testing Per-App VPN"
self.perAppManager.saveToPreferences { saveError in
/* Proceed to connect */
}
})
That was a very generic case and forPerAppVPN() is only available on macOS. A more real-world case world case for iOS would be to create this process through MDM. That entire flow is explained in the documentation I mentioned previously. I would start by just creating a configuration profile in Configurator 2 and testing it out.
No idea if it works on OpenVPN
I have tried a couple of different things, and at this point I am stumped. I simply want to be able to access the user's email to present it in a view. However I have not been able to successfully present, much less retrieve, this information. Here are the two pieces of code I have tried with:
func getUsername() -> String? {
if(self.isAuth) {
return AWSMobileClient.default().username
} else {
return nil
}
}
and
func getUserEmail() -> String {
var returnValue = String()
AWSMobileClient.default().getUserAttributes { (attributes, error) in
if(error != nil){
print("ERROR: \(String(describing: error))")
}else{
if let attributesDict = attributes{
//print(attributesDict["email"])
self.name = attributesDict["name"]!
returnValue = attributesDict["name"]!
}
}
}
print("return value: \(returnValue)")
return returnValue
}
Does anyone know why this is not working?
After sign in try this:
AWSMobileClient.default().getTokens { (tokens, error) in
if let error = error {
print("error \(error)")
} else if let tokens = tokens {
let claims = tokens.idToken?.claims
print("claims \(claims)")
print("email? \(claims?["email"] as? String ?? "No email")")
}
}
I've tried getting the user attributes using AWSMobileClient getUserAttributes with no success. Also tried using AWSCognitoIdentityPool getDetails With no success. Might be an error from AWS Mobile Client, but we can still get attributes from the id token, as seen above.
If you are using Hosted UI, remember to give your hosted UI the correct scopes, for example:
let hostedUIOptions = HostedUIOptions(scopes: ["openid", "email", "profile"], identityProvider: "Google")
It is because it is an async function so will return but later than when the function actually ends with the value. Only way I found to do it is placing a while loop and then using an if condition.
I am trying to connect programmatically to a VPN. I got the code below on this website: http://blog.moatazthenervous.com/create-a-vpn-connection-with-apple-swift/
I am trying to develop a command line application for macOS to connect programatically to a VPN.
import Foundation
import NetworkExtension
class VPN {
let vpnManager = NEVPNManager.shared();
let userName: String;
let passString: String;
let secret: String;
let server: String;
init (_ user: String, _ pass: String, _ secret: String, _ server: String){
userName = user
passString = pass
self.secret = secret
self.server = server
}
private var vpnLoadHandler: (Error?) -> Void { return
{ (error:Error?) in
if ((error) != nil) {
print("Could not load VPN Configurations")
return;
}
print ("me! me! ")
let p = NEVPNProtocolIPSec()
p.username = self.userName
p.serverAddress = self.server
p.authenticationMethod = NEVPNIKEAuthenticationMethod.sharedSecret
let kcs = KeychainService();
kcs.save(key: "SHARED", value: self.secret )
kcs.save(key: "VPN_PASSWORD", value: self.passString)
p.sharedSecretReference = kcs.load(key: "SHARED")
p.passwordReference = kcs.load(key: "VPN_PASSWORD")
p.useExtendedAuthentication = true
p.disconnectOnSleep = false
p.localIdentifier = "uio"
self.vpnManager.protocolConfiguration = p
self.vpnManager.localizedDescription = "Contensi"
self.vpnManager.isEnabled = true
self.vpnManager.saveToPreferences(completionHandler: self.vpnSaveHandler)
} }
private var vpnSaveHandler: (Error?) -> Void { return
{ (error:Error?) in
if (error != nil) {
print("Could not save VPN Configurations")
return
} else {
do {
try self.vpnManager.connection.startVPNTunnel()
} catch let error {
print("Error starting VPN Connection \(error.localizedDescription)");
}
}
}
}
public func connectVPN() {
//For no known reason the process of saving/loading the VPN configurations fails.On the 2nd time it works
do {
self.vpnManager.loadFromPreferences(completionHandler: self.vpnLoadHandler)
// self.vpnManager.saveToPreferences(completionHandler: nil)
}
}
public func disconnectVPN() ->Void {
self.vpnManager.connection.stopVPNTunnel()
}
public func status() -> NEVPNStatus {
return vpnManager.connection.status
}
}
My problem is that I my completion handlers are not working. Take the function connectVPN(), for instance. It's completion handler is vpnLoadHandler. However, I never get that handler executed. See the print statement on the handler? Nothing ever gets printed.
Reading Apple's documentation, I know that I have to configure XCode with an entitlement in order to allow VPN - I haven't got the "capabilities"-tab, so I don't know how to add that entitlement. I am not sure if that's the problem, since the app compiles file and executes. I just don't get the completion handler to execute.
So, basically:
why isn't the handler being called? And what can I do to debug?
Could this be due the lack an entitlement to allow the configuration of a personal vpn in xcode? If so, how can I configure that?
Best,
Francis
UPDATE I actually managed to create the entitlements file, and I guess it has the proper settings to allow a personal vpn. So I guess that part is solved. But why isn't the completion handler called?
Im using SMS verification to verify users. My problem is that when I enter a code to verify I get invalid code. I can't for the life of me figure out why.
Calling cloud code function:
#IBAction func verifyCodeButtonTapped(sender: AnyObject) {
var verificationCode: String = verificationCodeTextField.text!
let textFieldText = verificationCodeTextField.text ?? ""
if verificationCode.utf16.count != 4 {
displayAlert("Error", message: "You must entert the 4 digit verification code sent yo your phone")
} else {
let params = ["verifyPhoneNumber" : textFieldText]
PFCloud.callFunctionInBackground("verifyPhoneNumber", withParameters: params, block: { (object: AnyObject?, error) -> Void in
if error == nil {
self.performSegueWithIdentifier("showVerifyCodeView", sender: self)
} else {
self.displayAlert("Sorry", message: "We couldnt verify you. Please check that you enterd the correct 4 digit code sent to your phone")
}
})
}
}
Cloud code to verify code:
Parse.Cloud.define("verifyPhoneNumber", function(request, response) {
var user = Parse.User.current();
var verificationCode = user.get("phoneVerificationCode");
if (verificationCode == request.params.phoneVerificationCode) {
user.set("phoneNumber", request.params.phoneNumber);
user.save();
response.success("Success");
} else {
response.error("Invalid verification code.");
}
});
Twilio developer evangelist here.
In the Parse code, you are expecting request.params.phoneVerificationCode but when you call the cloud function from iOS you let params = ["verifyPhoneNumber" : textFieldText].
So, either change that line to
let params = ["phoneVerificationCode" : textFieldText]
so that it matches the cloud code. Or change your cloud code to
if (verificationCode == request.params.verifyPhoneNumber) {
so that it matches the iOS code.