25d8e56c53
The Settings app runs under the current user, which previously lacked the necessary permissions to install client certificates in HSUM mode. This change allows any admin user to install these certificates. Bug: b/370013519 Flag: EXEMPT bugfix Test: manually installed and removed client certificate for WiFi Change-Id: I57a7364c76a0adb7ed4112e48fb20070ab9d7bff
611 lines
23 KiB
Java
611 lines
23 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings;
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import android.annotation.LayoutRes;
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import android.app.Dialog;
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import android.app.settings.SettingsEnums;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.os.AsyncTask;
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import android.os.Bundle;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.os.Process;
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import android.os.RemoteException;
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import android.os.UserHandle;
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import android.os.UserManager;
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import android.security.Credentials;
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import android.security.IKeyChainService;
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import android.security.KeyChain;
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import android.security.KeyChain.KeyChainConnection;
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import android.security.keystore.KeyProperties;
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import android.security.keystore2.AndroidKeyStoreLoadStoreParameter;
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import android.util.Log;
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import android.util.SparseArray;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.TextView;
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import androidx.annotation.Nullable;
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import androidx.annotation.VisibleForTesting;
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import androidx.appcompat.app.AlertDialog;
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import androidx.fragment.app.DialogFragment;
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import androidx.fragment.app.Fragment;
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import androidx.recyclerview.widget.RecyclerView;
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import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
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import com.android.settings.wifi.helper.SavedWifiHelper;
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import com.android.settingslib.RestrictedLockUtils;
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import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
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import com.android.settingslib.RestrictedLockUtilsInternal;
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import java.security.Key;
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import java.security.KeyStore;
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import java.security.KeyStoreException;
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import java.security.NoSuchAlgorithmException;
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import java.security.UnrecoverableKeyException;
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import java.security.cert.Certificate;
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import java.util.ArrayList;
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import java.util.EnumSet;
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import java.util.Enumeration;
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import java.util.List;
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import java.util.SortedMap;
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import java.util.TreeMap;
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import javax.crypto.SecretKey;
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public class UserCredentialsSettings extends SettingsPreferenceFragment
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implements View.OnClickListener {
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private static final String TAG = "UserCredentialsSettings";
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private static final String KEYSTORE_PROVIDER = "AndroidKeyStore";
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@VisibleForTesting
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protected SavedWifiHelper mSavedWifiHelper;
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@Override
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public int getMetricsCategory() {
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return SettingsEnums.USER_CREDENTIALS;
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}
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@Override
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public void onResume() {
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super.onResume();
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refreshItems();
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}
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@Override
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public void onClick(final View view) {
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final Credential item = (Credential) view.getTag();
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if (item == null) return;
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if (item.isInUse()) {
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item.setUsedByNames(mSavedWifiHelper.getCertificateNetworkNames(item.alias));
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}
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showCredentialDialogFragment(item);
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}
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@Override
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public void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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getActivity().setTitle(R.string.user_credentials);
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mSavedWifiHelper = SavedWifiHelper.getInstance(getContext(), getSettingsLifecycle());
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}
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@VisibleForTesting
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protected void showCredentialDialogFragment(Credential item) {
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CredentialDialogFragment.show(this, item);
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}
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protected void announceRemoval(String alias) {
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if (!isAdded()) {
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return;
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}
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getListView().announceForAccessibility(getString(R.string.user_credential_removed, alias));
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}
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protected void refreshItems() {
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if (isAdded()) {
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new AliasLoader().execute();
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}
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}
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/** The fragment to show the credential information. */
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public static class CredentialDialogFragment extends InstrumentedDialogFragment
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implements DialogInterface.OnShowListener {
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private static final String TAG = "CredentialDialogFragment";
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private static final String ARG_CREDENTIAL = "credential";
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public static void show(Fragment target, Credential item) {
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final Bundle args = new Bundle();
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args.putParcelable(ARG_CREDENTIAL, item);
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if (target.getFragmentManager().findFragmentByTag(TAG) == null) {
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final DialogFragment frag = new CredentialDialogFragment();
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frag.setTargetFragment(target, /* requestCode */ -1);
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frag.setArguments(args);
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frag.show(target.getFragmentManager(), TAG);
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}
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}
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@Override
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public Dialog onCreateDialog(Bundle savedInstanceState) {
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final Credential item = (Credential) getArguments().getParcelable(ARG_CREDENTIAL);
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View root = getActivity().getLayoutInflater()
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.inflate(R.layout.user_credential_dialog, null);
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ViewGroup infoContainer = (ViewGroup) root.findViewById(R.id.credential_container);
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View contentView = getCredentialView(item, R.layout.user_credential, null,
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infoContainer, /* expanded */ true);
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infoContainer.addView(contentView);
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AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
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.setView(root)
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.setTitle(R.string.user_credential_title)
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.setPositiveButton(R.string.done, null);
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final String restriction = UserManager.DISALLOW_CONFIG_CREDENTIALS;
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final int myUserId = UserHandle.myUserId();
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if (!RestrictedLockUtilsInternal.hasBaseUserRestriction(getContext(), restriction,
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myUserId)) {
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DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
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@Override public void onClick(DialogInterface dialog, int id) {
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final EnforcedAdmin admin = RestrictedLockUtilsInternal
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.checkIfRestrictionEnforced(getContext(), restriction, myUserId);
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if (admin != null) {
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RestrictedLockUtils.sendShowAdminSupportDetailsIntent(getContext(),
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admin);
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} else {
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new RemoveCredentialsTask(getContext(), getTargetFragment())
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.execute(item);
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}
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dialog.dismiss();
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}
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};
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builder.setNegativeButton(R.string.trusted_credentials_remove_label, listener);
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}
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AlertDialog dialog = builder.create();
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dialog.setOnShowListener(this);
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return dialog;
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}
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/**
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* Override for the negative button enablement on demand.
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*/
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@Override
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public void onShow(DialogInterface dialogInterface) {
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final Credential item = (Credential) getArguments().getParcelable(ARG_CREDENTIAL);
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if (item.isInUse()) {
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((AlertDialog) getDialog()).getButton(AlertDialog.BUTTON_NEGATIVE)
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.setEnabled(false);
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}
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}
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@Override
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public int getMetricsCategory() {
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return SettingsEnums.DIALOG_USER_CREDENTIAL;
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}
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/**
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* Deletes all certificates and keys under a given alias.
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*
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* If the {@link Credential} is for a system alias, all active grants to the alias will be
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* removed using {@link KeyChain}. If the {@link Credential} is for Wi-Fi alias, all
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* credentials and keys will be removed using {@link KeyStore}.
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*/
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private class RemoveCredentialsTask extends AsyncTask<Credential, Void, Credential[]> {
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private Context context;
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private Fragment targetFragment;
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public RemoveCredentialsTask(Context context, Fragment targetFragment) {
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this.context = context;
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this.targetFragment = targetFragment;
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}
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@Override
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protected Credential[] doInBackground(Credential... credentials) {
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for (final Credential credential : credentials) {
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if (credential.isSystem()) {
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removeGrantsAndDelete(credential);
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} else {
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deleteWifiCredential(credential);
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}
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}
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return credentials;
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}
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private void deleteWifiCredential(final Credential credential) {
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try {
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final KeyStore keyStore = KeyStore.getInstance(KEYSTORE_PROVIDER);
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keyStore.load(
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new AndroidKeyStoreLoadStoreParameter(
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KeyProperties.NAMESPACE_WIFI));
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keyStore.deleteEntry(credential.getAlias());
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} catch (Exception e) {
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throw new RuntimeException("Failed to delete keys from keystore.");
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}
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}
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private void removeGrantsAndDelete(final Credential credential) {
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final KeyChainConnection conn;
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try {
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conn = KeyChain.bind(getContext());
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} catch (InterruptedException e) {
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Log.w(TAG, "Connecting to KeyChain", e);
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return;
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}
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try {
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IKeyChainService keyChain = conn.getService();
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keyChain.removeKeyPair(credential.alias);
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} catch (RemoteException e) {
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Log.w(TAG, "Removing credentials", e);
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} finally {
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conn.close();
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}
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}
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@Override
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protected void onPostExecute(Credential... credentials) {
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if (targetFragment instanceof UserCredentialsSettings && targetFragment.isAdded()) {
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final UserCredentialsSettings target = (UserCredentialsSettings) targetFragment;
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for (final Credential credential : credentials) {
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target.announceRemoval(credential.alias);
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}
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target.refreshItems();
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}
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}
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}
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}
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/**
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* Opens a background connection to KeyStore to list user credentials.
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* The credentials are stored in a {@link CredentialAdapter} attached to the main
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* {@link ListView} in the fragment.
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*/
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private class AliasLoader extends AsyncTask<Void, Void, List<Credential>> {
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/**
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* @return a list of credentials ordered:
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* <ol>
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* <li>first by purpose;</li>
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* <li>then by alias.</li>
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* </ol>
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*/
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@Override
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protected List<Credential> doInBackground(Void... params) {
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// Certificates can be installed into SYSTEM_UID or WIFI_UID through CertInstaller.
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final int myUserId = UserHandle.myUserId();
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final int systemUid = UserHandle.getUid(myUserId, Process.SYSTEM_UID);
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try {
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KeyStore processKeystore = KeyStore.getInstance(KEYSTORE_PROVIDER);
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processKeystore.load(null);
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KeyStore wifiKeystore = null;
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List<Credential> credentials = new ArrayList<>();
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credentials.addAll(getCredentialsForUid(processKeystore, systemUid).values());
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UserManager userManager = getContext().getSystemService(UserManager.class);
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if (userManager.isAdminUser()) {
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wifiKeystore = KeyStore.getInstance(KEYSTORE_PROVIDER);
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wifiKeystore.load(
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new AndroidKeyStoreLoadStoreParameter(KeyProperties.NAMESPACE_WIFI));
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credentials.addAll(
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getCredentialsForUid(wifiKeystore, Process.WIFI_UID).values());
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}
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return credentials;
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} catch (Exception e) {
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throw new RuntimeException("Failed to load credentials from Keystore.", e);
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}
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}
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private SortedMap<String, Credential> getCredentialsForUid(KeyStore keyStore, int uid) {
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try {
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final SortedMap<String, Credential> aliasMap = new TreeMap<>();
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Enumeration<String> aliases = keyStore.aliases();
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while (aliases.hasMoreElements()) {
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String alias = aliases.nextElement();
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Credential c = new Credential(alias, uid);
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if (!c.isSystem()) {
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c.setInUse(mSavedWifiHelper.isCertificateInUse(alias));
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}
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Key key = null;
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try {
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key = keyStore.getKey(alias, null);
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} catch (NoSuchAlgorithmException | UnrecoverableKeyException e) {
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Log.e(TAG, "Error tying to retrieve key: " + alias, e);
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continue;
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}
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if (key != null) {
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// So we have a key
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if (key instanceof SecretKey) {
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// We don't display any symmetric key entries.
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continue;
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}
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// At this point we have determined that we have an asymmetric key.
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// so we have at least a USER_KEY and USER_CERTIFICATE.
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c.storedTypes.add(Credential.Type.USER_KEY);
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Certificate[] certs = keyStore.getCertificateChain(alias);
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if (certs != null) {
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c.storedTypes.add(Credential.Type.USER_CERTIFICATE);
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if (certs.length > 1) {
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c.storedTypes.add(Credential.Type.CA_CERTIFICATE);
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}
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}
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} else {
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// So there is no key but we have an alias. This must mean that we have
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// some certificate.
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if (keyStore.isCertificateEntry(alias)) {
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c.storedTypes.add(Credential.Type.CA_CERTIFICATE);
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} else {
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// This is a weired inconsistent case that should not exist.
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// Pure trusted certificate entries should be stored in CA_CERTIFICATE,
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// but if isCErtificateEntry returns null this means that only the
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// USER_CERTIFICATE is populated which should never be the case without
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// a private key. It can still be retrieved with
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// keystore.getCertificate().
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c.storedTypes.add(Credential.Type.USER_CERTIFICATE);
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}
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}
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aliasMap.put(alias, c);
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}
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return aliasMap;
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} catch (KeyStoreException e) {
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throw new RuntimeException("Failed to load credential from Android Keystore.", e);
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}
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}
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@Override
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protected void onPostExecute(List<Credential> credentials) {
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if (!isAdded()) {
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return;
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}
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if (credentials == null || credentials.size() == 0) {
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// Create a "no credentials installed" message for the empty case.
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TextView emptyTextView = (TextView) getActivity().findViewById(android.R.id.empty);
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emptyTextView.setText(R.string.user_credential_none_installed);
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setEmptyView(emptyTextView);
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} else {
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setEmptyView(null);
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}
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getListView().setAdapter(
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new CredentialAdapter(credentials, UserCredentialsSettings.this));
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}
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}
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/**
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* Helper class to display {@link Credential}s in a list.
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*/
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private static class CredentialAdapter extends RecyclerView.Adapter<ViewHolder> {
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private static final int LAYOUT_RESOURCE = R.layout.user_credential_preference;
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private final List<Credential> mItems;
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private final View.OnClickListener mListener;
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public CredentialAdapter(List<Credential> items, @Nullable View.OnClickListener listener) {
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mItems = items;
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mListener = listener;
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}
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@Override
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public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
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final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
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return new ViewHolder(inflater.inflate(LAYOUT_RESOURCE, parent, false));
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}
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@Override
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public void onBindViewHolder(ViewHolder h, int position) {
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getCredentialView(mItems.get(position), LAYOUT_RESOURCE, h.itemView, null, false);
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h.itemView.setTag(mItems.get(position));
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h.itemView.setOnClickListener(mListener);
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}
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@Override
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public int getItemCount() {
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return mItems.size();
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}
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}
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private static class ViewHolder extends RecyclerView.ViewHolder {
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public ViewHolder(View item) {
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super(item);
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}
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}
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/**
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* Mapping from View IDs in {@link R} to the types of credentials they describe.
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*/
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private static final SparseArray<Credential.Type> credentialViewTypes = new SparseArray<>();
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static {
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credentialViewTypes.put(R.id.contents_userkey, Credential.Type.USER_KEY);
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credentialViewTypes.put(R.id.contents_usercrt, Credential.Type.USER_CERTIFICATE);
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credentialViewTypes.put(R.id.contents_cacrt, Credential.Type.CA_CERTIFICATE);
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}
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protected static View getCredentialView(Credential item, @LayoutRes int layoutResource,
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@Nullable View view, ViewGroup parent, boolean expanded) {
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if (view == null) {
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view = LayoutInflater.from(parent.getContext()).inflate(layoutResource, parent, false);
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}
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((TextView) view.findViewById(R.id.alias)).setText(item.alias);
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updatePurposeView(view.findViewById(R.id.purpose), item);
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view.findViewById(R.id.contents).setVisibility(expanded ? View.VISIBLE : View.GONE);
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if (expanded) {
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updateUsedByViews(view.findViewById(R.id.credential_being_used_by_title),
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view.findViewById(R.id.credential_being_used_by_content), item);
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for (int i = 0; i < credentialViewTypes.size(); i++) {
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final View detail = view.findViewById(credentialViewTypes.keyAt(i));
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detail.setVisibility(item.storedTypes.contains(credentialViewTypes.valueAt(i))
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? View.VISIBLE : View.GONE);
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}
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}
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return view;
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}
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@VisibleForTesting
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protected static void updatePurposeView(TextView purpose, Credential item) {
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int subTextResId = R.string.credential_for_vpn_and_apps;
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if (!item.isSystem()) {
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subTextResId = (item.isInUse())
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? R.string.credential_for_wifi_in_use
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: R.string.credential_for_wifi;
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}
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purpose.setText(subTextResId);
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}
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@VisibleForTesting
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protected static void updateUsedByViews(TextView title, TextView content, Credential item) {
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List<String> usedByNames = item.getUsedByNames();
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if (usedByNames.size() > 0) {
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title.setVisibility(View.VISIBLE);
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content.setText(String.join("\n", usedByNames));
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content.setVisibility(View.VISIBLE);
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} else {
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title.setVisibility(View.GONE);
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content.setVisibility(View.GONE);
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}
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}
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static class AliasEntry {
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public String alias;
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public int uid;
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}
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static class Credential implements Parcelable {
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static enum Type {
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CA_CERTIFICATE (Credentials.CA_CERTIFICATE),
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USER_CERTIFICATE (Credentials.USER_CERTIFICATE),
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USER_KEY(Credentials.USER_PRIVATE_KEY, Credentials.USER_SECRET_KEY);
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final String[] prefix;
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Type(String... prefix) {
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this.prefix = prefix;
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}
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}
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/**
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* Main part of the credential's alias. To fetch an item from KeyStore, prepend one of the
|
|
* prefixes from {@link CredentialItem.storedTypes}.
|
|
*/
|
|
final String alias;
|
|
|
|
/**
|
|
* UID under which this credential is stored. Typically {@link Process#SYSTEM_UID} but can
|
|
* also be {@link Process#WIFI_UID} for credentials installed as wifi certificates.
|
|
*/
|
|
final int uid;
|
|
|
|
/**
|
|
* Indicate whether or not this credential is in use.
|
|
*/
|
|
boolean mIsInUse;
|
|
|
|
/**
|
|
* The list of networks which use this credential.
|
|
*/
|
|
List<String> mUsedByNames = new ArrayList<>();
|
|
|
|
/**
|
|
* Should contain some non-empty subset of:
|
|
* <ul>
|
|
* <li>{@link Credentials.CA_CERTIFICATE}</li>
|
|
* <li>{@link Credentials.USER_CERTIFICATE}</li>
|
|
* <li>{@link Credentials.USER_KEY}</li>
|
|
* </ul>
|
|
*/
|
|
final EnumSet<Type> storedTypes = EnumSet.noneOf(Type.class);
|
|
|
|
Credential(final String alias, final int uid) {
|
|
this.alias = alias;
|
|
this.uid = uid;
|
|
}
|
|
|
|
Credential(Parcel in) {
|
|
this(in.readString(), in.readInt());
|
|
|
|
long typeBits = in.readLong();
|
|
for (Type i : Type.values()) {
|
|
if ((typeBits & (1L << i.ordinal())) != 0L) {
|
|
storedTypes.add(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
public void writeToParcel(Parcel out, int flags) {
|
|
out.writeString(alias);
|
|
out.writeInt(uid);
|
|
|
|
long typeBits = 0;
|
|
for (Type i : storedTypes) {
|
|
typeBits |= 1L << i.ordinal();
|
|
}
|
|
out.writeLong(typeBits);
|
|
}
|
|
|
|
public int describeContents() {
|
|
return 0;
|
|
}
|
|
|
|
public static final Parcelable.Creator<Credential> CREATOR
|
|
= new Parcelable.Creator<Credential>() {
|
|
public Credential createFromParcel(Parcel in) {
|
|
return new Credential(in);
|
|
}
|
|
|
|
public Credential[] newArray(int size) {
|
|
return new Credential[size];
|
|
}
|
|
};
|
|
|
|
public boolean isSystem() {
|
|
return UserHandle.getAppId(uid) == Process.SYSTEM_UID;
|
|
}
|
|
|
|
public String getAlias() {
|
|
return alias;
|
|
}
|
|
|
|
public EnumSet<Type> getStoredTypes() {
|
|
return storedTypes;
|
|
}
|
|
|
|
public void setInUse(boolean inUse) {
|
|
mIsInUse = inUse;
|
|
}
|
|
|
|
public boolean isInUse() {
|
|
return mIsInUse;
|
|
}
|
|
|
|
public void setUsedByNames(List<String> names) {
|
|
mUsedByNames = new ArrayList<>(names);
|
|
}
|
|
|
|
public List<String> getUsedByNames() {
|
|
return new ArrayList<String>(mUsedByNames);
|
|
}
|
|
}
|
|
}
|