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BiometricAuthenticator: implement biometric authentication for sensitive operations

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When biometric hardware is available, it will be used to authenticate
the user before private keys are shown on screen or when zip exports
are executed.

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>
This commit is contained in:
Harsh Shandilya 2020-03-30 10:45:49 +05:30 committed by Jason A. Donenfeld
parent 3095e19e13
commit d2721f2d7d
6 changed files with 127 additions and 18 deletions
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17
build.gradle
View File

@ -7,27 +7,28 @@ allprojects {
buildscript {
ext {
agpVersion = '3.6.1'
annotationsVersion = '1.1.0'
appcompatVersion = '1.1.0'
bintrayPluginVersion = '1.8.4'
biometricVersion = '1.0.1'
cardviewVersion = '1.0.0'
collectionVersion = '1.1.0'
coreKtxVersion = '1.2.0'
coroutinesVersion = '1.3.5'
constraintLayoutVersion = '1.1.3'
coordinatorLayoutVersion = '1.1.0'
agpVersion = '3.6.1'
coreKtxVersion = '1.2.0'
coroutinesVersion = '1.3.5'
eddsaVersion = '0.3.0'
fragmentVersion = '1.2.3'
materialComponentsVersion = '1.1.0'
jsr305Version = '3.0.2'
junitVersion = '4.13'
kotlinVersion = '1.3.71'
materialComponentsVersion = '1.1.0'
mavenPluginVersion = '2.1'
preferenceVersion = '1.1.0'
streamsupportVersion = '1.7.2'
threetenabpVersion = '1.2.3'
zxingEmbeddedVersion = '3.6.0'
eddsaVersion = '0.3.0'
bintrayPluginVersion = '1.8.4'
mavenPluginVersion = '2.1'
junitVersion = '4.13'
groupName = 'com.wireguard.android'
}

1
ui/build.gradle
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@ -68,6 +68,7 @@ dependencies {
implementation "androidx.cardview:cardview:$cardviewVersion"
implementation "androidx.constraintlayout:constraintlayout:$constraintLayoutVersion"
implementation "androidx.coordinatorlayout:coordinatorlayout:$coordinatorLayoutVersion"
implementation "androidx.biometric:biometric:$biometricVersion"
implementation "androidx.core:core-ktx:$coreKtxVersion"
implementation "androidx.databinding:databinding-runtime:$agpVersion"
implementation "androidx.fragment:fragment:$fragmentVersion"

21
ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.kt
View File

@ -25,6 +25,7 @@ import com.wireguard.android.backend.Tunnel
import com.wireguard.android.databinding.TunnelEditorFragmentBinding
import com.wireguard.android.fragment.AppListDialogFragment.AppExclusionListener
import com.wireguard.android.model.ObservableTunnel
import com.wireguard.android.util.BiometricAuthenticator
import com.wireguard.android.util.ErrorMessages
import com.wireguard.android.viewmodel.ConfigProxy
import com.wireguard.android.widget.EdgeToEdge.setUpRoot
@ -233,13 +234,27 @@ class TunnelEditorFragment : BaseFragment(), AppExclusionListener {
if (!isFocused) return
val edit = view as? EditText ?: return
if (!haveShownKeys && edit.text.isNotEmpty()) {
if (true /* TODO: do biometric auth prompt */) {
BiometricAuthenticator.authenticate(R.string.biometric_prompt_private_key_title, requireActivity()) {
when (it) {
is BiometricAuthenticator.Result.Success, is BiometricAuthenticator.Result.HardwareUnavailableOrDisabled -> {
haveShownKeys = true
showPrivateKey(edit)
}
is BiometricAuthenticator.Result.Failure -> {
Snackbar.make(
binding!!.mainContainer,
it.message,
Snackbar.LENGTH_SHORT
).show()
}
}
}
} else {
/* Unauthorized, so return and don't change visibility. */
return
showPrivateKey(edit)
}
}
private fun showPrivateKey(edit: EditText) {
requireActivity().window.addFlags(WindowManager.LayoutParams.FLAG_SECURE)
edit.inputType = InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS or InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
}

19
ui/src/main/java/com/wireguard/android/preference/ZipExporterPreference.kt
View File

@ -14,6 +14,7 @@ import com.google.android.material.snackbar.Snackbar
import com.wireguard.android.Application
import com.wireguard.android.R
import com.wireguard.android.model.ObservableTunnel
import com.wireguard.android.util.BiometricAuthenticator
import com.wireguard.android.util.DownloadsFileSaver
import com.wireguard.android.util.ErrorMessages
import com.wireguard.android.util.FragmentUtils
@ -81,14 +82,28 @@ class ZipExporterPreference(context: Context, attrs: AttributeSet?) : Preference
override fun getTitle() = context.getString(R.string.zip_export_title)
override fun onClick() {
FragmentUtils.getPrefActivity(this)
.ensurePermissions(arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE)) { _, grantResults ->
val prefActivity = FragmentUtils.getPrefActivity(this)
BiometricAuthenticator.authenticate(R.string.biometric_prompt_zip_exporter_title, prefActivity) {
when (it) {
// When we have successful authentication, or when there is no biometric hardware available.
is BiometricAuthenticator.Result.Success, is BiometricAuthenticator.Result.HardwareUnavailableOrDisabled -> {
prefActivity.ensurePermissions(arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE)) { _, grantResults ->
if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
isEnabled = false
exportZip()
}
}
}
is BiometricAuthenticator.Result.Failure -> {
Snackbar.make(
prefActivity.findViewById(android.R.id.content),
it.message,
Snackbar.LENGTH_SHORT
).show()
}
}
}
}
companion object {
private const val TAG = "WireGuard/ZipExporterPreference"

73
ui/src/main/java/com/wireguard/android/util/BiometricAuthenticator.kt Normal file
View File

@ -0,0 +1,73 @@
/*
* Copyright © 2020 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.util
import android.os.Handler
import android.util.Log
import androidx.annotation.StringRes
import androidx.biometric.BiometricConstants
import androidx.biometric.BiometricManager
import androidx.biometric.BiometricPrompt
import androidx.fragment.app.FragmentActivity
import com.wireguard.android.R
object BiometricAuthenticator {
private const val TAG = "WireGuard/BiometricAuthenticator"
private val handler = Handler()
sealed class Result {
data class Success(val cryptoObject: BiometricPrompt.CryptoObject?) : Result()
data class Failure(val code: Int?, val message: CharSequence) : Result()
object HardwareUnavailableOrDisabled : Result()
object Cancelled : Result()
}
fun authenticate(
@StringRes dialogTitleRes: Int,
fragmentActivity: FragmentActivity,
callback: (Result) -> Unit
) {
val biometricManager = BiometricManager.from(fragmentActivity)
val authCallback = object : BiometricPrompt.AuthenticationCallback() {
override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
super.onAuthenticationError(errorCode, errString)
Log.d(TAG, "BiometricAuthentication error: errorCode=$errorCode, msg=$errString")
callback(when (errorCode) {
BiometricConstants.ERROR_CANCELED, BiometricConstants.ERROR_USER_CANCELED,
BiometricConstants.ERROR_NEGATIVE_BUTTON -> {
Result.Cancelled
}
BiometricConstants.ERROR_HW_NOT_PRESENT, BiometricConstants.ERROR_HW_UNAVAILABLE,
BiometricConstants.ERROR_NO_BIOMETRICS, BiometricConstants.ERROR_NO_DEVICE_CREDENTIAL -> {
Result.HardwareUnavailableOrDisabled
}
else -> Result.Failure(errorCode, fragmentActivity.getString(R.string.biometric_auth_error_reason, errString))
})
}
override fun onAuthenticationFailed() {
super.onAuthenticationFailed()
callback(Result.Failure(null, fragmentActivity.getString(R.string.biometric_auth_error)))
}
override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
super.onAuthenticationSucceeded(result)
callback(Result.Success(result.cryptoObject))
}
}
val biometricPrompt = BiometricPrompt(fragmentActivity, { handler.post(it) }, authCallback)
val promptInfo = BiometricPrompt.PromptInfo.Builder()
.setTitle(fragmentActivity.getString(dialogTitleRes))
.setDeviceCredentialAllowed(true)
.build()
if (biometricManager.canAuthenticate() == BiometricManager.BIOMETRIC_SUCCESS) {
biometricPrompt.authenticate(promptInfo)
} else {
callback(Result.HardwareUnavailableOrDisabled)
}
}
}

4
ui/src/main/res/values/strings.xml
View File

@ -191,4 +191,8 @@
<string name="zip_export_success">Saved to “%s”</string>
<string name="zip_export_summary">Zip file will be saved to downloads folder</string>
<string name="zip_export_title">Export tunnels to zip file</string>
<string name="biometric_prompt_zip_exporter_title">Authenticate to export tunnels</string>
<string name="biometric_prompt_private_key_title">Authenticate to view private key</string>
<string name="biometric_auth_error">Authentication failure</string>
<string name="biometric_auth_error_reason">Authentication failure: %s</string>
</resources>