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Unlock DB using NFC tag. Select entry using NFC tag. Use secure NFC tags. #1359

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Unlock DB using NFC tag. Select entry using NFC tag. Use secure NFC tags. #1359

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98c47ed
In this branch: Unlock database with NFC tag (incomplete). Select ent…
plamenjm Jul 5, 2022
0f875bb
Unlock with readonly and writable NFC tags. NFC authentication and re…
plamenjm Jul 31, 2022
dc654b8
revert whitespace changes :(
plamenjm Jul 31, 2022
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3 changes: 3 additions & 0 deletions app/build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,9 @@ android {
minifyEnabled = false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
debug {
applicationIdSuffix 'debug' //todo-op!!! disable
}
}

flavorDimensions "version"
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1 change: 1 addition & 0 deletions app/src/main/AndroidManifest.xml
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Expand Up @@ -20,6 +20,7 @@
<uses-permission
android:name="android.permission.QUERY_ALL_PACKAGES"
tools:ignore="QueryAllPackagesPermission" />
<uses-permission android:name="android.permission.NFC" />

<application
android:label="@string/app_name"
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1 change: 1 addition & 0 deletions app/src/main/java/com/kunzisoft/keepass/activities/MainCredentialActivity.kt
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Expand Up @@ -352,6 +352,7 @@ class MainCredentialActivity : DatabaseModeActivity(), AdvancedUnlockFragment.Bu

override fun onNewIntent(intent: Intent?) {
super.onNewIntent(intent)
if (true == advancedUnlockFragment?.nfc?.checkAndProcessTag(intent)) return
getUriFromIntent(intent)
}

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272 changes: 257 additions & 15 deletions app/src/main/java/com/kunzisoft/keepass/biometric/AdvancedUnlockFragment.kt
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30 changes: 19 additions & 11 deletions app/src/main/java/com/kunzisoft/keepass/biometric/AdvancedUnlockManager.kt
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Expand Up @@ -74,6 +74,7 @@ class AdvancedUnlockManager(private var retrieveContext: () -> FragmentActivity)

private var isKeyManagerInit = false

private val unlockNfcEnable = PreferencesUtil.isUnlockNfcEnable(retrieveContext())
private val biometricUnlockEnable = PreferencesUtil.isBiometricUnlockEnable(retrieveContext())
private val deviceCredentialUnlockEnable = PreferencesUtil.isDeviceCredentialUnlockEnable(retrieveContext())

Expand Down Expand Up @@ -101,7 +102,7 @@ class AdvancedUnlockManager(private var retrieveContext: () -> FragmentActivity)
}

init {
if (isDeviceSecure(retrieveContext())
if (unlockNfcEnable || isDeviceSecure(retrieveContext())
&& (biometricUnlockEnable || deviceCredentialUnlockEnable)) {
try {
this.keyStore = KeyStore.getInstance(ADVANCED_UNLOCK_KEYSTORE)
Expand Down Expand Up @@ -213,15 +214,17 @@ class AdvancedUnlockManager(private var retrieveContext: () -> FragmentActivity)
}
}

@Synchronized fun encryptData(value: ByteArray) {
@Synchronized fun encryptData(value: ByteArray, unlockData: List<Byte>? = null, databaseKeyId: Int? = null) {
if (!isKeyManagerInitialized) {
return
}
try {
val encrypted = cipher?.doFinal(value) ?: byteArrayOf()
val valueAndData = if (true != unlockData?.isNotEmpty()) value else
value.toMutableList().also { it.addAll(unlockData) }.toByteArray()
val encrypted = cipher?.doFinal(valueAndData) ?: byteArrayOf()
// passes updated iv spec on to callback so this can be stored for decryption
cipher?.parameters?.getParameterSpec(IvParameterSpec::class.java)?.let{ spec ->
advancedUnlockCallback?.handleEncryptedResult(encrypted, spec.iv)
advancedUnlockCallback?.handleEncryptedResult(encrypted, spec.iv, databaseKeyId)
}
} catch (e: Exception) {
Log.e(TAG, "Unable to encrypt data", e)
Expand Down Expand Up @@ -278,14 +281,19 @@ class AdvancedUnlockManager(private var retrieveContext: () -> FragmentActivity)
}
}

@Synchronized fun decryptData(encryptedValue: ByteArray) {
@Synchronized fun decryptData(encryptedValue: ByteArray, unlockDataSize: Int = 0, databaseKeyId: Int? = null, onUnlockData: ((ByteArray, List<Byte>) -> Boolean)? = null) {
if (!isKeyManagerInitialized) {
return
}
try {
// actual decryption here
cipher?.doFinal(encryptedValue)?.let { decrypted ->
advancedUnlockCallback?.handleDecryptedResult(decrypted)
cipher?.doFinal(encryptedValue)?.let { valueArray ->
val decrypted = if (valueArray.size <= unlockDataSize) valueArray else {
valueArray.take(valueArray.size - unlockDataSize).toByteArray().also {
if (true != onUnlockData?.invoke(it, valueArray.takeLast(unlockDataSize))) throw Exception("Invalid unlock data.")
}
}
advancedUnlockCallback?.handleDecryptedResult(decrypted, databaseKeyId)
}
} catch (badPaddingException: BadPaddingException) {
Log.e(TAG, "Unable to decrypt data", badPaddingException)
Expand Down Expand Up @@ -360,8 +368,8 @@ class AdvancedUnlockManager(private var retrieveContext: () -> FragmentActivity)
fun onAuthenticationSucceeded()
fun onAuthenticationFailed()
fun onAuthenticationError(errorCode: Int, errString: CharSequence)
fun handleEncryptedResult(encryptedValue: ByteArray, ivSpec: ByteArray)
fun handleDecryptedResult(decryptedValue: ByteArray)
fun handleEncryptedResult(encryptedValue: ByteArray, ivSpec: ByteArray, databaseKeyId: Int?)
fun handleDecryptedResult(decryptedValue: ByteArray, databaseKeyId: Int?)
}

companion object {
Expand Down Expand Up @@ -455,9 +463,9 @@ class AdvancedUnlockManager(private var retrieveContext: () -> FragmentActivity)

override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {}

override fun handleEncryptedResult(encryptedValue: ByteArray, ivSpec: ByteArray) {}
override fun handleEncryptedResult(encryptedValue: ByteArray, ivSpec: ByteArray, databaseKeyId: Int?) {}

override fun handleDecryptedResult(decryptedValue: ByteArray) {}
override fun handleDecryptedResult(decryptedValue: ByteArray, databaseKeyId: Int?) {}

override fun onUnrecoverableKeyException(e: Exception) {
advancedCallback.onUnrecoverableKeyException(e)
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