/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.vpn2;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.SystemProperties;
import android.security.Credentials;
import android.security.KeyStore;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Spinner;
import android.widget.TextView;
import com.android.internal.net.VpnProfile;
import com.android.settings.R;
import java.net.InetAddress;
/**
* Dialog showing information about a VPN configuration. The dialog
* can be launched to either edit or prompt for credentials to connect
* to a user-added VPN.
*
* {@see AppDialog}
*/
class ConfigDialog extends AlertDialog implements TextWatcher,
View.OnClickListener, AdapterView.OnItemSelectedListener,
CompoundButton.OnCheckedChangeListener {
private final KeyStore mKeyStore = KeyStore.getInstance();
private final DialogInterface.OnClickListener mListener;
private final VpnProfile mProfile;
private boolean mEditing;
private boolean mExists;
private View mView;
private TextView mName;
private Spinner mType;
private TextView mServer;
private TextView mUsername;
private TextView mPassword;
private TextView mSearchDomains;
private TextView mDnsServers;
private TextView mRoutes;
private CheckBox mMppe;
private TextView mL2tpSecret;
private TextView mIpsecIdentifier;
private TextView mIpsecSecret;
private Spinner mIpsecUserCert;
private Spinner mIpsecCaCert;
private Spinner mIpsecServerCert;
private CheckBox mSaveLogin;
private CheckBox mShowOptions;
private CheckBox mAlwaysOnVpn;
ConfigDialog(Context context, DialogInterface.OnClickListener listener,
VpnProfile profile, boolean editing, boolean exists) {
super(context);
mListener = listener;
mProfile = profile;
mEditing = editing;
mExists = exists;
}
@Override
protected void onCreate(Bundle savedState) {
mView = getLayoutInflater().inflate(R.layout.vpn_dialog, null);
setView(mView);
Context context = getContext();
// First, find out all the fields.
mName = (TextView) mView.findViewById(R.id.name);
mType = (Spinner) mView.findViewById(R.id.type);
mServer = (TextView) mView.findViewById(R.id.server);
mUsername = (TextView) mView.findViewById(R.id.username);
mPassword = (TextView) mView.findViewById(R.id.password);
mSearchDomains = (TextView) mView.findViewById(R.id.search_domains);
mDnsServers = (TextView) mView.findViewById(R.id.dns_servers);
mRoutes = (TextView) mView.findViewById(R.id.routes);
mMppe = (CheckBox) mView.findViewById(R.id.mppe);
mL2tpSecret = (TextView) mView.findViewById(R.id.l2tp_secret);
mIpsecIdentifier = (TextView) mView.findViewById(R.id.ipsec_identifier);
mIpsecSecret = (TextView) mView.findViewById(R.id.ipsec_secret);
mIpsecUserCert = (Spinner) mView.findViewById(R.id.ipsec_user_cert);
mIpsecCaCert = (Spinner) mView.findViewById(R.id.ipsec_ca_cert);
mIpsecServerCert = (Spinner) mView.findViewById(R.id.ipsec_server_cert);
mSaveLogin = (CheckBox) mView.findViewById(R.id.save_login);
mShowOptions = (CheckBox) mView.findViewById(R.id.show_options);
mAlwaysOnVpn = (CheckBox) mView.findViewById(R.id.always_on_vpn);
// Second, copy values from the profile.
mName.setText(mProfile.name);
mType.setSelection(mProfile.type);
mServer.setText(mProfile.server);
if (mProfile.saveLogin) {
mUsername.setText(mProfile.username);
mPassword.setText(mProfile.password);
}
mSearchDomains.setText(mProfile.searchDomains);
mDnsServers.setText(mProfile.dnsServers);
mRoutes.setText(mProfile.routes);
mMppe.setChecked(mProfile.mppe);
mL2tpSecret.setText(mProfile.l2tpSecret);
mIpsecIdentifier.setText(mProfile.ipsecIdentifier);
mIpsecSecret.setText(mProfile.ipsecSecret);
loadCertificates(mIpsecUserCert, Credentials.USER_PRIVATE_KEY, 0, mProfile.ipsecUserCert);
loadCertificates(mIpsecCaCert, Credentials.CA_CERTIFICATE,
R.string.vpn_no_ca_cert, mProfile.ipsecCaCert);
loadCertificates(mIpsecServerCert, Credentials.USER_CERTIFICATE,
R.string.vpn_no_server_cert, mProfile.ipsecServerCert);
mSaveLogin.setChecked(mProfile.saveLogin);
mAlwaysOnVpn.setChecked(mProfile.key.equals(VpnUtils.getLockdownVpn()));
mAlwaysOnVpn.setOnCheckedChangeListener(this);
// Update SaveLogin checkbox after Always-on checkbox is updated
updateSaveLoginStatus();
// Hide lockdown VPN on devices that require IMS authentication
if (SystemProperties.getBoolean("persist.radio.imsregrequired", false)) {
mAlwaysOnVpn.setVisibility(View.GONE);
}
// Third, add listeners to required fields.
mName.addTextChangedListener(this);
mType.setOnItemSelectedListener(this);
mServer.addTextChangedListener(this);
mUsername.addTextChangedListener(this);
mPassword.addTextChangedListener(this);
mDnsServers.addTextChangedListener(this);
mRoutes.addTextChangedListener(this);
mIpsecSecret.addTextChangedListener(this);
mIpsecUserCert.setOnItemSelectedListener(this);
mShowOptions.setOnClickListener(this);
// Fourth, determine whether to do editing or connecting.
boolean valid = validate(true);
mEditing = mEditing || !valid;
if (mEditing) {
setTitle(R.string.vpn_edit);
// Show common fields.
mView.findViewById(R.id.editor).setVisibility(View.VISIBLE);
// Show type-specific fields.
changeType(mProfile.type);
// Hide 'save login' when we are editing.
mSaveLogin.setVisibility(View.GONE);
// Switch to advanced view immediately if any advanced options are on
if (!mProfile.searchDomains.isEmpty() || !mProfile.dnsServers.isEmpty() ||
!mProfile.routes.isEmpty()) {
showAdvancedOptions();
}
// Create a button to forget the profile if it has already been saved..
if (mExists) {
setButton(DialogInterface.BUTTON_NEUTRAL,
context.getString(R.string.vpn_forget), mListener);
}
// Create a button to save the profile.
setButton(DialogInterface.BUTTON_POSITIVE,
context.getString(R.string.vpn_save), mListener);
} else {
setTitle(context.getString(R.string.vpn_connect_to, mProfile.name));
// Create a button to connect the network.
setButton(DialogInterface.BUTTON_POSITIVE,
context.getString(R.string.vpn_connect), mListener);
}
// Always provide a cancel button.
setButton(DialogInterface.BUTTON_NEGATIVE,
context.getString(R.string.vpn_cancel), mListener);
// Let AlertDialog create everything.
super.onCreate(savedState);
// Disable the action button if necessary.
getButton(DialogInterface.BUTTON_POSITIVE)
.setEnabled(mEditing ? valid : validate(false));
// Workaround to resize the dialog for the input method.
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE |
WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
}
@Override
public void onRestoreInstanceState(Bundle savedState) {
super.onRestoreInstanceState(savedState);
// Visibility isn't restored by super.onRestoreInstanceState, so re-show the advanced
// options here if they were already revealed or set.
if (mShowOptions.isChecked()) {
showAdvancedOptions();
}
}
@Override
public void afterTextChanged(Editable field) {
getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(validate(mEditing));
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void onClick(View view) {
if (view == mShowOptions) {
showAdvancedOptions();
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (parent == mType) {
changeType(position);
}
getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(validate(mEditing));
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (compoundButton == mAlwaysOnVpn) {
updateSaveLoginStatus();
getButton(DialogInterface.BUTTON_POSITIVE).setEnabled(validate(mEditing));
}
}
public boolean isVpnAlwaysOn() {
return mAlwaysOnVpn.isChecked();
}
private void updateSaveLoginStatus() {
if (mAlwaysOnVpn.isChecked()) {
mSaveLogin.setChecked(true);
mSaveLogin.setEnabled(false);
} else {
mSaveLogin.setChecked(mProfile.saveLogin);
mSaveLogin.setEnabled(true);
}
}
private void showAdvancedOptions() {
mView.findViewById(R.id.options).setVisibility(View.VISIBLE);
mShowOptions.setVisibility(View.GONE);
}
private void changeType(int type) {
// First, hide everything.
mMppe.setVisibility(View.GONE);
mView.findViewById(R.id.l2tp).setVisibility(View.GONE);
mView.findViewById(R.id.ipsec_psk).setVisibility(View.GONE);
mView.findViewById(R.id.ipsec_user).setVisibility(View.GONE);
mView.findViewById(R.id.ipsec_peer).setVisibility(View.GONE);
// Then, unhide type-specific fields.
switch (type) {
case VpnProfile.TYPE_PPTP:
mMppe.setVisibility(View.VISIBLE);
break;
case VpnProfile.TYPE_L2TP_IPSEC_PSK:
mView.findViewById(R.id.l2tp).setVisibility(View.VISIBLE);
// fall through
case VpnProfile.TYPE_IPSEC_XAUTH_PSK:
mView.findViewById(R.id.ipsec_psk).setVisibility(View.VISIBLE);
break;
case VpnProfile.TYPE_L2TP_IPSEC_RSA:
mView.findViewById(R.id.l2tp).setVisibility(View.VISIBLE);
// fall through
case VpnProfile.TYPE_IPSEC_XAUTH_RSA:
mView.findViewById(R.id.ipsec_user).setVisibility(View.VISIBLE);
// fall through
case VpnProfile.TYPE_IPSEC_HYBRID_RSA:
mView.findViewById(R.id.ipsec_peer).setVisibility(View.VISIBLE);
break;
}
}
private boolean validate(boolean editing) {
if (mAlwaysOnVpn.isChecked() && !getProfile().isValidLockdownProfile()) {
return false;
}
if (!editing) {
return mUsername.getText().length() != 0 && mPassword.getText().length() != 0;
}
if (mName.getText().length() == 0 || mServer.getText().length() == 0 ||
!validateAddresses(mDnsServers.getText().toString(), false) ||
!validateAddresses(mRoutes.getText().toString(), true)) {
return false;
}
switch (mType.getSelectedItemPosition()) {
case VpnProfile.TYPE_PPTP:
case VpnProfile.TYPE_IPSEC_HYBRID_RSA:
return true;
case VpnProfile.TYPE_L2TP_IPSEC_PSK:
case VpnProfile.TYPE_IPSEC_XAUTH_PSK:
return mIpsecSecret.getText().length() != 0;
case VpnProfile.TYPE_L2TP_IPSEC_RSA:
case VpnProfile.TYPE_IPSEC_XAUTH_RSA:
return mIpsecUserCert.getSelectedItemPosition() != 0;
}
return false;
}
private boolean validateAddresses(String addresses, boolean cidr) {
try {
for (String address : addresses.split(" ")) {
if (address.isEmpty()) {
continue;
}
// Legacy VPN currently only supports IPv4.
int prefixLength = 32;
if (cidr) {
String[] parts = address.split("/", 2);
address = parts[0];
prefixLength = Integer.parseInt(parts[1]);
}
byte[] bytes = InetAddress.parseNumericAddress(address).getAddress();
int integer = (bytes[3] & 0xFF) | (bytes[2] & 0xFF) << 8 |
(bytes[1] & 0xFF) << 16 | (bytes[0] & 0xFF) << 24;
if (bytes.length != 4 || prefixLength < 0 || prefixLength > 32 ||
(prefixLength < 32 && (integer << prefixLength) != 0)) {
return false;
}
}
} catch (Exception e) {
return false;
}
return true;
}
private void loadCertificates(Spinner spinner, String prefix, int firstId, String selected) {
Context context = getContext();
String first = (firstId == 0) ? "" : context.getString(firstId);
String[] certificates = mKeyStore.list(prefix);
if (certificates == null || certificates.length == 0) {
certificates = new String[] {first};
} else {
String[] array = new String[certificates.length + 1];
array[0] = first;
System.arraycopy(certificates, 0, array, 1, certificates.length);
certificates = array;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
context, android.R.layout.simple_spinner_item, certificates);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
for (int i = 1; i < certificates.length; ++i) {
if (certificates[i].equals(selected)) {
spinner.setSelection(i);
break;
}
}
}
boolean isEditing() {
return mEditing;
}
VpnProfile getProfile() {
// First, save common fields.
VpnProfile profile = new VpnProfile(mProfile.key);
profile.name = mName.getText().toString();
profile.type = mType.getSelectedItemPosition();
profile.server = mServer.getText().toString().trim();
profile.username = mUsername.getText().toString();
profile.password = mPassword.getText().toString();
profile.searchDomains = mSearchDomains.getText().toString().trim();
profile.dnsServers = mDnsServers.getText().toString().trim();
profile.routes = mRoutes.getText().toString().trim();
// Then, save type-specific fields.
switch (profile.type) {
case VpnProfile.TYPE_PPTP:
profile.mppe = mMppe.isChecked();
break;
case VpnProfile.TYPE_L2TP_IPSEC_PSK:
profile.l2tpSecret = mL2tpSecret.getText().toString();
// fall through
case VpnProfile.TYPE_IPSEC_XAUTH_PSK:
profile.ipsecIdentifier = mIpsecIdentifier.getText().toString();
profile.ipsecSecret = mIpsecSecret.getText().toString();
break;
case VpnProfile.TYPE_L2TP_IPSEC_RSA:
profile.l2tpSecret = mL2tpSecret.getText().toString();
// fall through
case VpnProfile.TYPE_IPSEC_XAUTH_RSA:
if (mIpsecUserCert.getSelectedItemPosition() != 0) {
profile.ipsecUserCert = (String) mIpsecUserCert.getSelectedItem();
}
// fall through
case VpnProfile.TYPE_IPSEC_HYBRID_RSA:
if (mIpsecCaCert.getSelectedItemPosition() != 0) {
profile.ipsecCaCert = (String) mIpsecCaCert.getSelectedItem();
}
if (mIpsecServerCert.getSelectedItemPosition() != 0) {
profile.ipsecServerCert = (String) mIpsecServerCert.getSelectedItem();
}
break;
}
final boolean hasLogin = !profile.username.isEmpty() || !profile.password.isEmpty();
profile.saveLogin = mSaveLogin.isChecked() || (mEditing && hasLogin);
return profile;
}
}