/*
* Copyright (c) 2016 - 2021 Jonathan Schleifer <js@nil.im>
*
* https://fossil.nil.im/cryptopassphrase
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
import UIKit
import ObjFW
import ObjFWBridge
class ShowDetailsController: UITableViewController, UITextFieldDelegate {
@IBOutlet var nameField: UITextField?
@IBOutlet var lengthField: UITextField?
@IBOutlet var legacySwitch: UISwitch?
@IBOutlet var keyFileField: UITextField?
@IBOutlet var passphraseField: UITextField?
public var mainViewController: MainViewController?
private var name: String = ""
private var length: UInt = 0
private var isLegacy: Bool = false
private var keyFile: String? = nil
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
guard let mainViewController = self.mainViewController else { return }
guard let tableView = mainViewController.tableView else { return }
let siteStorage = mainViewController.siteStorage
guard let indexPath = tableView.indexPathForSelectedRow else { return }
name = mainViewController.sites[indexPath.row]
length = siteStorage.length(forSite: name)
isLegacy = siteStorage.isLegacy(site: name)
keyFile = siteStorage.keyFile(forSite: name)
nameField?.text = name
lengthField?.text = "\(length)"
legacySwitch?.isOn = isLegacy
keyFileField?.text = keyFile
tableView.deselectRow(at: indexPath, animated: true)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return false
}
static private func clearNSMutableString(_ string: NSMutableString) {
/*
* NSMutableString does not offer a way to zero the string.
* This is in the hope that setting a single character at an index just
* replaces that character in memory, and thus allows us to zero the
* password.
*/
for i in 0..<string.length {
string.replaceCharacters(in: NSRange(location: i, length: 1),
with: " ")
}
}
override func tableView(_ tableView: UITableView,
didSelectRowAt indexPath: IndexPath) {
passphraseField?.resignFirstResponder()
tableView.deselectRow(at: indexPath, animated: true)
if indexPath.section == 3 {
switch indexPath.row {
case 0:
self.generateAndCopy()
case 1:
self.generateAndShow()
default:
break
}
}
}
private func generateAndCopy() {
self.generateWithCallback { (password: NSMutableString) in
let pasteboard = UIPasteboard.general
pasteboard.string = password as String
ShowDetailsController.clearNSMutableString(password)
let message = "The password has been copied into the clipboard."
let alert = UIAlertController(title: "Password Generated",
message: message,
preferredStyle: .alert)
let action = UIAlertAction(title: "OK", style: .default) {
(UIAlertAction) in
self.navigationController?.popViewController(animated: true)
}
alert.addAction(action)
self.present(alert, animated: true, completion: nil)
}
}
private func generateAndShow() {
self.generateWithCallback { (password: NSMutableString) in
let alert = UIAlertController(title: "Generated Passphrase",
message: password as String,
preferredStyle: .alert)
let action = UIAlertAction(title: "OK", style: .default) {
(UIAlertAction) in
self.navigationController?.popViewController(animated: true)
}
alert.addAction(action)
self.present(alert, animated: true) {
ShowDetailsController.clearNSMutableString(password)
}
}
}
private func generateWithCallback(
_ block: @escaping (_: NSMutableString) -> ()
) {
let generator: PasswordGenerator = isLegacy ?
LegacyPasswordGenerator() : NewPasswordGenerator()
generator.site = name.ofObject
generator.length = size_t(length)
if let keyFile = keyFile {
guard let documentDirectory = NSSearchPathForDirectoriesInDomains(
.documentDirectory, .userDomainMask, true).first
else {
print("Could not get key files: No documents directory")
return
}
let keyFilePath = documentDirectory.ofObject.appendingPathComponent(
keyFile.ofObject)
generator.keyFile = OFMutableData(contentsOfFile: keyFilePath)
}
let passphraseText = (passphraseField?.text ?? "") as NSString
let passphraseLen =
passphraseText.lengthOfBytes(using: String.Encoding.utf8.rawValue)
let passphrase = OFSecureData(count: passphraseLen,
allowsSwappableMemory: false)
memcpy(passphrase.mutableItems, passphraseText.utf8String!,
passphraseLen)
generator.passphrase = passphrase
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let activityController = mainStoryboard.instantiateViewController(
withIdentifier: "activityIndicator")
navigationController?.view.addSubview(activityController.view)
DispatchQueue.global(qos: .default).async {
generator.derivePassword()
let password = NSMutableString(
bytes: generator.output.items!,
length: generator.length,
encoding: String.Encoding.utf8.rawValue)!
DispatchQueue.main.sync {
activityController.view.isHidden = true
block(password)
}
}
}
@IBAction func remove(_ sender: Any?) {
let message = "Do you want to remove this site?"
let alert = UIAlertController(title: "Remove Site?",
message: message,
preferredStyle: .alert)
alert.addAction(
UIAlertAction(title: "No", style: .cancel, handler: nil))
let yesAction = UIAlertAction(title: "Yes", style: .destructive) {
(UIAlertAction) in
self.mainViewController?.siteStorage.removeSite(self.name)
self.mainViewController?.reset()
self.navigationController?.popViewController(animated: true)
}
alert.addAction(yesAction)
self.present(alert, animated: true, completion: nil)
}
}