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/*
* Copyright (c) 2012-2018 Arne Schwabe
* Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
*/
package de.blinkt.openvpn.fragments
import android.annotation.TargetApi
import android.app.Activity
import android.app.AlertDialog
import android.content.ActivityNotFoundException
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.security.KeyChain
import android.security.KeyChainException
import android.security.keystore.KeyInfo
import android.text.TextUtils
import android.view.View
import android.widget.AdapterView
import android.widget.Spinner
import android.widget.TextView
import android.widget.Toast
import de.blinkt.openvpn.R
import de.blinkt.openvpn.VpnProfile
import de.blinkt.openvpn.api.ExternalCertificateProvider
import de.blinkt.openvpn.core.ExtAuthHelper
import de.blinkt.openvpn.core.X509Utils
import java.security.KeyFactory
import java.security.PrivateKey
import java.security.cert.X509Certificate
internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnClickListener, Handler.Callback {
private lateinit var mAliasCertificate: TextView
private lateinit var mAliasName: TextView
private var mHandler: Handler? = null
private lateinit var mExtAliasName: TextView
private lateinit var mExtAuthSpinner: Spinner
private val isInHardwareKeystore: Boolean
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
@Throws(KeyChainException::class, InterruptedException::class)
get() {
val key: PrivateKey = KeyChain.getPrivateKey(requireActivity().applicationContext, mProfile.mAlias) ?: return false
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
val keyFactory = KeyFactory.getInstance(key.getAlgorithm(), "AndroidKeyStore")
val keyInfo = keyFactory.getKeySpec(key, KeyInfo::class.java)
return keyInfo.isInsideSecureHardware()
} else {
val algorithm = key.algorithm
return KeyChain.isBoundKeyAlgorithm(algorithm)
}
}
private fun setKeyStoreAlias() {
if (mProfile.mAlias == null) {
mAliasName.setText(R.string.client_no_certificate)
mAliasCertificate.text = ""
} else {
mAliasCertificate.text = "Loading certificate from Keystore..."
mAliasName.text = mProfile.mAlias
setCertificate(false)
}
}
private fun setExtAlias() {
if (mProfile.mAlias == null) {
mExtAliasName.setText(R.string.extauth_not_configured)
mAliasCertificate.text = ""
} else {
mAliasCertificate.text = "Querying certificate from external provider..."
mExtAliasName.text = ""
setCertificate(true)
}
}
private fun fetchExtCertificateMetaData() {
object : Thread() {
override fun run() {
try {
val b = ExtAuthHelper.getCertificateMetaData(context!!, mProfile.mExternalAuthenticator, mProfile.mAlias)
mProfile.mAlias = b.getString(ExtAuthHelper.EXTRA_ALIAS)
requireActivity().runOnUiThread { setAlias() }
} catch (e: KeyChainException) {
e.printStackTrace()
}
}
}.start()
}
protected fun setCertificate(external: Boolean) {
object : Thread() {
override fun run() {
var certstr = ""
var metadata: Bundle? = null
try {
var cert: X509Certificate? = null
if (external) {
if (!TextUtils.isEmpty(mProfile.mExternalAuthenticator) && !TextUtils.isEmpty(mProfile.mAlias)) {
cert = ExtAuthHelper.getCertificateChain(context!!, mProfile.mExternalAuthenticator, mProfile.mAlias)!![0]
metadata = ExtAuthHelper.getCertificateMetaData(context!!, mProfile.mExternalAuthenticator, mProfile.mAlias)
} else {
cert = null
certstr = getString(R.string.extauth_not_configured)
}
} else {
val certChain = KeyChain.getCertificateChain(requireActivity().applicationContext, mProfile.mAlias)
if (certChain != null) {
cert = certChain[0]
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
run {
if (isInHardwareKeystore)
certstr += getString(R.string.hwkeychain)
}
}
}
}
if (cert != null) {
certstr += X509Utils.getCertificateValidityString(cert, resources)
certstr += ", "
certstr += X509Utils.getCertificateFriendlyName(cert)
}
} catch (e: Exception) {
certstr = "Could not get certificate from Keystore: " + e.localizedMessage
}
val certStringCopy = certstr
val finalMetadata = metadata
requireActivity().runOnUiThread {
mAliasCertificate.text = certStringCopy
if (finalMetadata != null)
mExtAliasName.text = finalMetadata.getString(ExtAuthHelper.EXTRA_DESCRIPTION)
}
}
}.start()
}
protected fun initKeychainViews(v: View) {
v.findViewById<View>(R.id.select_keystore_button).setOnClickListener(this)
v.findViewById<View>(R.id.configure_extauth_button)?.setOnClickListener(this)
v.findViewById<View>(R.id.install_keystore_button).setOnClickListener(this)
mAliasCertificate = v.findViewById(R.id.alias_certificate)
mExtAuthSpinner = v.findViewById(R.id.extauth_spinner)
mExtAuthSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
val selectedProvider = parent.getItemAtPosition(position) as ExtAuthHelper.ExternalAuthProvider
if (selectedProvider.packageName != mProfile.mExternalAuthenticator) {
mProfile.mAlias = ""
}
}
override fun onNothingSelected(parent: AdapterView<*>) {
}
}
mExtAliasName = v.findViewById(R.id.extauth_detail)
mAliasName = v.findViewById(R.id.aliasname)
if (mHandler == null) {
mHandler = Handler(this)
}
ExtAuthHelper.setExternalAuthProviderSpinnerList(mExtAuthSpinner, mProfile.mExternalAuthenticator)
v.findViewById<View>(R.id.install_keystore_button).setOnClickListener {
startActivity(KeyChain.createInstallIntent())
};
}
override fun onClick(v: View) {
if (v === v.findViewById<View>(R.id.select_keystore_button)) {
showCertDialog()
} else if (v === v.findViewById<View>(R.id.configure_extauth_button)) {
startExternalAuthConfig()
}
}
private fun startExternalAuthConfig() {
val eAuth = mExtAuthSpinner.selectedItem as ExtAuthHelper.ExternalAuthProvider
mProfile.mExternalAuthenticator = eAuth.packageName
if (!eAuth.configurable) {
fetchExtCertificateMetaData()
return
}
val extauth = Intent(ExtAuthHelper.ACTION_CERT_CONFIGURATION)
extauth.setPackage(eAuth.packageName)
extauth.putExtra(ExtAuthHelper.EXTRA_ALIAS, mProfile.mAlias)
startActivityForResult(extauth, UPDATEE_EXT_ALIAS)
}
override fun savePreferences() {
}
override fun onStart() {
super.onStart()
loadPreferences()
}
fun showCertDialog() {
try {
KeyChain.choosePrivateKeyAlias(requireActivity(),
{ alias ->
// Credential alias selected. Remember the alias selection for future use.
mProfile.mAlias = alias
mHandler!!.sendEmptyMessage(UPDATE_ALIAS)
},
arrayOf("RSA", "EC"), null, // issuer, null for any
mProfile.mServerName, // host name of server requesting the cert, null if unavailable
-1, // port of server requesting the cert, -1 if unavailable
mProfile.mAlias)// List of acceptable key types. null for any
// alias to preselect, null if unavailable
} catch (anf: ActivityNotFoundException) {
val ab = AlertDialog.Builder(activity)
ab.setTitle(R.string.broken_image_cert_title)
ab.setMessage(R.string.broken_image_cert)
ab.setPositiveButton(android.R.string.ok, null)
ab.show()
}
}
protected open fun loadPreferences() {
setAlias()
}
private fun setAlias() {
if (mProfile.mAuthenticationType == VpnProfile.TYPE_EXTERNAL_APP)
setExtAlias()
else
setKeyStoreAlias()
}
override fun handleMessage(msg: Message): Boolean {
setAlias()
return true
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (data != null && requestCode == UPDATEE_EXT_ALIAS && resultCode == Activity.RESULT_OK) {
mProfile.mAlias = data.getStringExtra(ExtAuthHelper.EXTRA_ALIAS)
mExtAliasName.text = data.getStringExtra(ExtAuthHelper.EXTRA_DESCRIPTION)
}
}
companion object {
private val UPDATE_ALIAS = 20
private val UPDATEE_EXT_ALIAS = 210
}
}
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