issue #1669 Validate secret keys

FlowCrypt/src/androidTest/assets/pgp/keys/issue_1669_corrupted_prv.asc

@@ -0,0 +1,64 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Comment: Corrupted encrypted RSA private key
+Comment: Passphrase is 123
+
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+=kFcl
+-----END PGP PRIVATE KEY BLOCK-----

FlowCrypt/src/androidTest/java/com/flowcrypt/email/ui/activity/CheckKeysActivityTestMultiBackups.kt

@@ -435,6 +435,23 @@ class CheckKeysActivityTestMultiBackups : BaseTest() {
     checkKeysTitleAtStart(4, keysPaths, KeyImportDetails.SourceType.FILE)
   }
 
+  /**
+   * It refers to https://github.com/FlowCrypt/flowcrypt-android/issues/1669
+   */
+  @Test
+  fun testImportCorruptedKey() {
+    val keysPaths = arrayOf("pgp/keys/issue_1669_corrupted_prv.asc")
+    launchActivity(keysPaths, KeyImportDetails.SourceType.FILE)
+    typePassword("123")
+    isDialogWithTextDisplayed(
+      decorView,
+      getResString(
+        R.string.warning_when_import_invalid_prv_key,
+        getResString(R.string.support_email)
+      )
+    )
+  }
+
   private fun launchActivity(
     keysPaths: Array<String>,
     sourceType: KeyImportDetails.SourceType = KeyImportDetails.SourceType.EMAIL

FlowCrypt/src/main/java/com/flowcrypt/email/jetpack/viewmodel/CheckPrivateKeysViewModel.kt

@@ -20,6 +20,7 @@ import com.flowcrypt.email.util.exception.WrongPassPhraseException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import org.pgpainless.exception.KeyIntegrityException
 import org.pgpainless.util.Passphrase
 
 /**
@@ -52,7 +53,7 @@ class CheckPrivateKeysViewModel(application: Application) : BaseAndroidViewModel
       val resultList = mutableListOf<CheckResult>()
       for (keyDetails in keys) {
         val copy = keyDetails.copy()
-        var e: Exception? = null
+        var e: Throwable? = null
         if (copy.isPrivate) {
           if (copy.passphraseType == null) {
             e = IllegalArgumentException(context.getString(R.string.passphrase_type_undefined))
@@ -66,15 +67,22 @@ class CheckPrivateKeysViewModel(application: Application) : BaseAndroidViewModel
               } else {
                 try {
                   PgpKey.decryptKey(prvKey, passphrase)
+                  //https://github.com/FlowCrypt/flowcrypt-android/issues/1669
+                  PgpKey.checkSecretKeyIntegrity(prvKey, passphrase)
                   copy.tempPassphrase = passphrase.chars
-                } catch (ex: Exception) {
+                } catch (ex: Throwable) {
                   //to prevent leak sensitive info we skip printing stack trace for release builds
                   if (GeneralUtil.isDebugBuild()) {
                     ex.printStackTrace()
                   }
-                  e = WrongPassPhraseException(
-                    message = context.getString(R.string.password_is_incorrect), cause = ex
-                  )
+
+                  e = when (ex) {
+                    is KeyIntegrityException -> ex
+
+                    else -> WrongPassPhraseException(
+                      message = context.getString(R.string.password_is_incorrect), cause = ex
+                    )
+                  }
                 }
               }
             }
@@ -96,6 +104,6 @@ class CheckPrivateKeysViewModel(application: Application) : BaseAndroidViewModel
 
   data class CheckResult(
     val pgpKeyDetails: PgpKeyDetails,
-    val passphrase: String, val e: Exception? = null
+    val passphrase: String, val e: Throwable? = null
   )
 }

FlowCrypt/src/main/java/com/flowcrypt/email/security/pgp/PgpKey.kt

@@ -17,9 +17,13 @@ import org.bouncycastle.openpgp.PGPPublicKey
 import org.bouncycastle.openpgp.PGPPublicKeyRing
 import org.bouncycastle.openpgp.PGPSecretKey
 import org.bouncycastle.openpgp.PGPSecretKeyRing
+import org.bouncycastle.openpgp.PGPSecretKeyRingCollection
 import org.bouncycastle.openpgp.PGPSignature
 import org.pgpainless.PGPainless
+import org.pgpainless.exception.KeyIntegrityException
 import org.pgpainless.key.collection.PGPKeyRingCollection
+import org.pgpainless.key.protection.SecretKeyRingProtector
+import org.pgpainless.key.protection.UnlockSecretKey
 import org.pgpainless.util.Passphrase
 import java.io.InputStream
 
@@ -111,6 +115,27 @@ object PgpKey {
       .done()
   }
 
+  @Throws(KeyIntegrityException::class)
+  fun checkSecretKeyIntegrity(armored: String, passphrase: Passphrase) {
+    val collection = PGPainless.readKeyRing().keyRingCollection(armored, false)
+    val secretKeyRings = collection.pgpSecretKeyRingCollection
+    if (secretKeyRings.size() == 0) throw KeyIntegrityException()
+    checkSecretKeyIntegrity(secretKeyRings, passphrase)
+  }
+
+  @Throws(KeyIntegrityException::class)
+  fun checkSecretKeyIntegrity(
+    secretKeyRings: PGPSecretKeyRingCollection,
+    passphrase: Passphrase
+  ) {
+    for (keyRing in secretKeyRings) {
+      val protector = SecretKeyRingProtector.unlockEachKeyWith(passphrase, keyRing)
+      for (key in keyRing.secretKeys) {
+        UnlockSecretKey.unlockSecretKey(key, protector)
+      }
+    }
+  }
+
   suspend fun parsePrivateKeys(source: String): List<PgpKeyDetails> = withContext(Dispatchers.IO) {
     parseKeys(source, false).pgpKeyRingCollection
       .pgpSecretKeyRingCollection.map { it.toPgpKeyDetails() }

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/CheckKeysActivity.kt

@@ -33,6 +33,7 @@ import com.flowcrypt.email.ui.activity.fragment.dialog.WebViewInfoDialogFragment
 import com.flowcrypt.email.util.GeneralUtil
 import com.flowcrypt.email.util.UIUtil
 import org.apache.commons.io.IOUtils
+import org.pgpainless.exception.KeyIntegrityException
 import org.pgpainless.util.Passphrase
 import java.io.IOException
 import java.nio.charset.StandardCharsets
@@ -286,7 +287,18 @@ class CheckKeysActivity : BaseActivity(), View.OnClickListener,
 
                 } else {
                   if (resultKeys.size == 1) {
-                    showInfoSnackbar(rootView, resultKeys.first().e?.message)
+                    when (resultKeys.first().e) {
+                      is KeyIntegrityException -> {
+                        showInfoDialogFragment(
+                          dialogMsg = getString(
+                            R.string.warning_when_import_invalid_prv_key,
+                            getString(R.string.support_email)
+                          )
+                        )
+                      }
+
+                      else -> showInfoSnackbar(rootView, resultKeys.first().e?.message)
+                    }
                   } else {
                     showInfoSnackbar(rootView, getString(R.string.password_is_incorrect))
                   }

FlowCrypt/src/main/res/values-ru/strings.xml

@@ -488,4 +488,5 @@
     <string name="warning_use_subject_as_password">Пожалуйста, не прописывайте пароль в тему сообщения. Передача пароля по электронной почте далает бессмысленным шифрование на основе пароля.\n\nВы можете попросить получателя также установить %1$s, сообщения между пользователями %1$s не нуждаются в пароле.</string>
     <string name="warning_use_private_key_pass_phrase_as_password">Пожалуйста, не используйте Вашу ключевую фразу в качестве пароля для даного сообщения.\n\nВы должны придумать какой-нибудь другой уникальный пароль, которым Вы можете поделиться с получателем.</string>
     <string name="synchronization">Синхронизация&#8230;</string>
+    <string name="warning_when_import_invalid_prv_key">Найден недействительный ключ. Импорт невозможен.\n\nЕсли это случится еще раз, пожалуйста, напишите нам на %1$s</string>
 </resources>

FlowCrypt/src/main/res/values/strings.xml

@@ -574,4 +574,5 @@
     <string name="warning_use_subject_as_password">Please do not include the password in the email subject. Sharing password over email undermines password based encryption.\n\nYou can ask the recipient to also install %1$s, messages between %1$s users don\'t need a password.</string>
     <string name="warning_use_private_key_pass_phrase_as_password">Please do not use your private key pass phrase as a password for this message.\n\nYou should come up with some other unique password that you can share with a recipient.</string>
     <string name="synchronization">Syncing&#8230;</string>
+    <string name="warning_when_import_invalid_prv_key">Key is invalid, you could not import such a key.\n\nIf this happens again, please write us at %1$s</string>
 </resources>

FlowCrypt/src/test/java/com/flowcrypt/email/security/pgp/PgpKeyTest.kt

@@ -13,8 +13,10 @@ import com.flowcrypt.email.util.TestUtil
 import org.bouncycastle.openpgp.PGPPublicKeyRing
 import org.bouncycastle.openpgp.PGPSecretKeyRing
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
 import org.junit.Test
 import org.pgpainless.PGPainless
+import org.pgpainless.exception.KeyIntegrityException
 import org.pgpainless.key.OpenPgpV4Fingerprint
 import org.pgpainless.util.Passphrase
 import java.nio.charset.Charset
@@ -114,4 +116,13 @@ class PgpKeyTest {
     val actual = PgpKey.parseKeys(keyText)
     assertEquals(1, actual.getAllKeys().size)
   }
+
+  @Test
+  fun testReadCorruptedPrivateKey() {
+    val encryptedKeyText = loadResourceAsString("keys/issue-1669-corrupted.private.gpg-key")
+    val passphrase = Passphrase.fromPassword("123")
+    assertThrows(KeyIntegrityException::class.java) {
+      PgpKey.checkSecretKeyIntegrity(encryptedKeyText, passphrase)
+    }
+  }
 }

FlowCrypt/src/test/resources/PgpKeyTest/keys/issue-1669-corrupted.private.gpg-key

@@ -0,0 +1,64 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Comment: Corrupted encrypted RSA private key
+Comment: Passphrase is 123
+
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+-----END PGP PRIVATE KEY BLOCK-----