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Remove EncryptionInterstitial for Full Disk Encryption

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Support for Full Disk Encryption was removed in Android 13, since now
File Based Encryption is always used instead.  It turns out that I
missed a fairly large chunk of obsolete code: EncryptionInterstitial,
which is the screen that asks whether the device will require the
primary user's lockscreen credential when it starts up.  This used to be
shown when setting the primary user's lockscreen credential, to
determine whether the full-disk encryption key would be tied to that
lockscreen credential or not.  But now it's unused code.

This CL removes all this unused code.

This should not change any behavior, with one very minor exception:
Settings will no longer explicitly set the REQUIRE_PASSWORD_TO_DECRYPT
setting to 0 whenever the primary user's lockscreen credential is
changed.  (This happened in SaveChosenLockWorkerBase.)  This setting is
a @SystemApi, but it no longer has any meaning, since it is never set to
1 anymore.  If there is a reason to keep it explicitly set to 0, instead
of unset, we should make LockSettingsService in system_server set it.

Test: Went through SUW, set a PIN, cleared the PIN, set a PIN again (all
      using the UI).  Nothing unusual seen.
Bug: 208476087
Change-Id: I039cc7a284e3f43e1e284970a5869958c909d1b7
This commit is contained in:
Eric Biggers
2022-12-14 01:21:12 +00:00
parent b64d2b2f9e
commit 5f1d894252
12 changed files with 20 additions and 648 deletions
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13
src/com/android/settings/password/SaveChosenLockWorkerBase.java
View File

@@ -16,12 +16,10 @@
package com.android.settings.password;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.UserHandle;
import android.os.UserManager;
import android.util.Pair;
import android.widget.Toast;
@@ -68,21 +66,12 @@ abstract class SaveChosenLockWorkerBase extends Fragment {
}
}
protected void prepare(LockPatternUtils utils, boolean credentialRequired,
boolean requestGatekeeperPassword, int userId) {
protected void prepare(LockPatternUtils utils, boolean requestGatekeeperPassword, int userId) {
mUtils = utils;
mUserId = userId;
mRequestGatekeeperPassword = requestGatekeeperPassword;
// This will be a no-op for non managed profiles.
mWasSecureBefore = mUtils.isSecure(mUserId);
Context context = getContext();
// If context is null, we're being invoked to change the setCredentialRequiredToDecrypt,
// and we made sure that this is the primary user already.
if (context == null || UserManager.get(context).getUserInfo(mUserId).isPrimary()) {
mUtils.setCredentialRequiredToDecrypt(credentialRequired);
}
mFinished = false;
mResultData = null;
}