Prevent cached passwords from being wiped (#884)

(cherry picked from commit 889208b)
Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

Author: FabianHenneke

app/src/main/java/com/zeapo/pwdstore/git/config/SshjSessionFactory.kt

@@ -38,13 +38,13 @@ import kotlin.coroutines.suspendCoroutine
 sealed class SshAuthData {
     class Password(val passwordFinder: InteractivePasswordFinder) : SshAuthData() {
         override fun clearCredentials() {
-            passwordFinder.clearPassword()
+            passwordFinder.clearPasswords()
         }
     }
 
     class PublicKeyFile(val keyFile: File, val passphraseFinder: InteractivePasswordFinder) : SshAuthData() {
         override fun clearCredentials() {
-            passphraseFinder.clearPassword()
+            passphraseFinder.clearPasswords()
         }
     }
 
@@ -57,13 +57,14 @@ abstract class InteractivePasswordFinder : PasswordFinder {
 
     private var isRetry = false
     private var lastPassword: CharArray? = null
+    private val rememberToWipe: MutableList<CharArray> = mutableListOf()
 
     fun resetForReuse() {
         isRetry = false
     }
 
-    fun clearPassword() {
-        lastPassword?.clear()
+    fun clearPasswords() {
+        rememberToWipe.forEach { it.clear() }
         lastPassword = null
     }
 
@@ -73,17 +74,20 @@ abstract class InteractivePasswordFinder : PasswordFinder {
             // now being reused for a new one. We try the previous password so that the user
             // does not have to type it again.
             isRetry = true
-            return lastPassword!!
+            return lastPassword!!.clone().also { rememberToWipe.add(it) }
         }
-        clearPassword()
+        clearPasswords()
         val password = runBlocking(Dispatchers.Main) {
             suspendCoroutine<String?> { cont ->
                 askForPassword(cont, isRetry)
             }
         }
         isRetry = true
-        return password?.toCharArray()?.also { lastPassword = it }
-            ?: throw SSHException(DisconnectReason.AUTH_CANCELLED_BY_USER)
+        if (password == null)
+            throw SSHException(DisconnectReason.AUTH_CANCELLED_BY_USER)
+        val passwordChars = password.toCharArray().also { rememberToWipe.add(it) }
+        lastPassword = passwordChars
+        return passwordChars.clone().also { rememberToWipe.add(it) }
     }
 
     final override fun shouldRetry(resource: Resource<*>?) = true