ChooseLockGeneric.java revision 57d7fa545b792f2fa97cc6aad0e9f466ba415ffe 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.settings;
18
19import android.app.Activity;
20import android.app.PendingIntent;
21import android.app.admin.DevicePolicyManager;
22import android.content.Context;
23import android.content.Intent;
24import android.content.pm.UserInfo;
25import android.os.Bundle;
26import android.os.Process;
27import android.os.UserHandle;
28import android.os.UserManager;
29import android.preference.Preference;
30import android.preference.PreferenceScreen;
31import android.security.KeyStore;
32import android.util.EventLog;
33import android.util.MutableBoolean;
34import android.view.LayoutInflater;
35import android.view.View;
36import android.view.ViewGroup;
37import android.widget.ListView;
38
39import com.android.internal.widget.LockPatternUtils;
40
41import java.util.List;
42
43public class ChooseLockGeneric extends SettingsActivity {
44
45    @Override
46    public Intent getIntent() {
47        Intent modIntent = new Intent(super.getIntent());
48        modIntent.putExtra(EXTRA_SHOW_FRAGMENT, ChooseLockGenericFragment.class.getName());
49        modIntent.putExtra(EXTRA_NO_HEADERS, true);
50        return modIntent;
51    }
52
53    @Override
54    protected boolean isValidFragment(String fragmentName) {
55        if (ChooseLockGenericFragment.class.getName().equals(fragmentName)) return true;
56        return false;
57    }
58
59    public static class InternalActivity extends ChooseLockGeneric {
60    }
61
62    public static class ChooseLockGenericFragment extends SettingsPreferenceFragment {
63        private static final int MIN_PASSWORD_LENGTH = 4;
64        private static final String KEY_UNLOCK_BACKUP_INFO = "unlock_backup_info";
65        private static final String KEY_UNLOCK_SET_OFF = "unlock_set_off";
66        private static final String KEY_UNLOCK_SET_NONE = "unlock_set_none";
67        private static final String KEY_UNLOCK_SET_BIOMETRIC_WEAK = "unlock_set_biometric_weak";
68        private static final String KEY_UNLOCK_SET_PIN = "unlock_set_pin";
69        private static final String KEY_UNLOCK_SET_PASSWORD = "unlock_set_password";
70        private static final String KEY_UNLOCK_SET_PATTERN = "unlock_set_pattern";
71        private static final int CONFIRM_EXISTING_REQUEST = 100;
72        private static final int FALLBACK_REQUEST = 101;
73        private static final String PASSWORD_CONFIRMED = "password_confirmed";
74        private static final String CONFIRM_CREDENTIALS = "confirm_credentials";
75        private static final String WAITING_FOR_CONFIRMATION = "waiting_for_confirmation";
76        private static final String FINISH_PENDING = "finish_pending";
77        public static final String MINIMUM_QUALITY_KEY = "minimum_quality";
78
79        private static final boolean ALWAY_SHOW_TUTORIAL = true;
80
81        private ChooseLockSettingsHelper mChooseLockSettingsHelper;
82        private DevicePolicyManager mDPM;
83        private KeyStore mKeyStore;
84        private boolean mPasswordConfirmed = false;
85        private boolean mWaitingForConfirmation = false;
86        private boolean mFinishPending = false;
87
88        @Override
89        public void onCreate(Bundle savedInstanceState) {
90            super.onCreate(savedInstanceState);
91
92            mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
93            mKeyStore = KeyStore.getInstance();
94            mChooseLockSettingsHelper = new ChooseLockSettingsHelper(this.getActivity());
95
96            // Defaults to needing to confirm credentials
97            final boolean confirmCredentials = getActivity().getIntent()
98                .getBooleanExtra(CONFIRM_CREDENTIALS, true);
99            if (getActivity() instanceof ChooseLockGeneric.InternalActivity) {
100                mPasswordConfirmed = !confirmCredentials;
101            }
102
103            if (savedInstanceState != null) {
104                mPasswordConfirmed = savedInstanceState.getBoolean(PASSWORD_CONFIRMED);
105                mWaitingForConfirmation = savedInstanceState.getBoolean(WAITING_FOR_CONFIRMATION);
106                mFinishPending = savedInstanceState.getBoolean(FINISH_PENDING);
107            }
108
109            if (mPasswordConfirmed) {
110                updatePreferencesOrFinish();
111            } else if (!mWaitingForConfirmation) {
112                ChooseLockSettingsHelper helper =
113                        new ChooseLockSettingsHelper(this.getActivity(), this);
114                if (!helper.launchConfirmationActivity(CONFIRM_EXISTING_REQUEST, null, null)) {
115                    mPasswordConfirmed = true; // no password set, so no need to confirm
116                    updatePreferencesOrFinish();
117                } else {
118                    mWaitingForConfirmation = true;
119                }
120            }
121        }
122
123        @Override
124        public void onResume() {
125            super.onResume();
126            if (mFinishPending) {
127                mFinishPending = false;
128                finish();
129            }
130        }
131
132        @Override
133        public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
134                Preference preference) {
135            final String key = preference.getKey();
136            boolean handled = true;
137
138            EventLog.writeEvent(EventLogTags.LOCK_SCREEN_TYPE, key);
139
140            if (KEY_UNLOCK_SET_OFF.equals(key)) {
141                updateUnlockMethodAndFinish(
142                        DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, true);
143            } else if (KEY_UNLOCK_SET_NONE.equals(key)) {
144                updateUnlockMethodAndFinish(
145                        DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, false);
146            } else if (KEY_UNLOCK_SET_BIOMETRIC_WEAK.equals(key)) {
147                updateUnlockMethodAndFinish(
148                        DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK, false);
149            }else if (KEY_UNLOCK_SET_PATTERN.equals(key)) {
150                updateUnlockMethodAndFinish(
151                        DevicePolicyManager.PASSWORD_QUALITY_SOMETHING, false);
152            } else if (KEY_UNLOCK_SET_PIN.equals(key)) {
153                updateUnlockMethodAndFinish(
154                        DevicePolicyManager.PASSWORD_QUALITY_NUMERIC, false);
155            } else if (KEY_UNLOCK_SET_PASSWORD.equals(key)) {
156                updateUnlockMethodAndFinish(
157                        DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC, false);
158            } else {
159                handled = false;
160            }
161            return handled;
162        }
163
164        @Override
165        public View onCreateView(LayoutInflater inflater, ViewGroup container,
166                Bundle savedInstanceState) {
167            View v = super.onCreateView(inflater, container, savedInstanceState);
168            final boolean onlyShowFallback = getActivity().getIntent()
169                    .getBooleanExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, false);
170            if (onlyShowFallback) {
171                View header = v.inflate(getActivity(),
172                        R.layout.weak_biometric_fallback_header, null);
173                ((ListView) v.findViewById(android.R.id.list)).addHeaderView(header, null, false);
174            }
175
176            return v;
177        }
178
179        @Override
180        public void onActivityResult(int requestCode, int resultCode, Intent data) {
181            super.onActivityResult(requestCode, resultCode, data);
182            mWaitingForConfirmation = false;
183            if (requestCode == CONFIRM_EXISTING_REQUEST && resultCode == Activity.RESULT_OK) {
184                mPasswordConfirmed = true;
185                updatePreferencesOrFinish();
186            } else if(requestCode == FALLBACK_REQUEST) {
187                mChooseLockSettingsHelper.utils().deleteTempGallery();
188                getActivity().setResult(resultCode);
189                finish();
190            } else {
191                getActivity().setResult(Activity.RESULT_CANCELED);
192                finish();
193            }
194        }
195
196        @Override
197        public void onSaveInstanceState(Bundle outState) {
198            super.onSaveInstanceState(outState);
199            // Saved so we don't force user to re-enter their password if configuration changes
200            outState.putBoolean(PASSWORD_CONFIRMED, mPasswordConfirmed);
201            outState.putBoolean(WAITING_FOR_CONFIRMATION, mWaitingForConfirmation);
202            outState.putBoolean(FINISH_PENDING, mFinishPending);
203        }
204
205        private void updatePreferencesOrFinish() {
206            Intent intent = getActivity().getIntent();
207            int quality = intent.getIntExtra(LockPatternUtils.PASSWORD_TYPE_KEY, -1);
208            if (quality == -1) {
209                // If caller didn't specify password quality, show UI and allow the user to choose.
210                quality = intent.getIntExtra(MINIMUM_QUALITY_KEY, -1);
211                MutableBoolean allowBiometric = new MutableBoolean(false);
212                quality = upgradeQuality(quality, allowBiometric);
213                final PreferenceScreen prefScreen = getPreferenceScreen();
214                if (prefScreen != null) {
215                    prefScreen.removeAll();
216                }
217                addPreferencesFromResource(R.xml.security_settings_picker);
218                disableUnusablePreferences(quality, allowBiometric);
219            } else {
220                updateUnlockMethodAndFinish(quality, false);
221            }
222        }
223
224        /** increases the quality if necessary, and returns whether biometric is allowed */
225        private int upgradeQuality(int quality, MutableBoolean allowBiometric) {
226            quality = upgradeQualityForDPM(quality);
227            quality = upgradeQualityForKeyStore(quality);
228            return quality;
229        }
230
231        private int upgradeQualityForDPM(int quality) {
232            // Compare min allowed password quality
233            int minQuality = mDPM.getPasswordQuality(null);
234            if (quality < minQuality) {
235                quality = minQuality;
236            }
237            return quality;
238        }
239
240        private int upgradeQualityForKeyStore(int quality) {
241            if (!mKeyStore.isEmpty()) {
242                if (quality < CredentialStorage.MIN_PASSWORD_QUALITY) {
243                    quality = CredentialStorage.MIN_PASSWORD_QUALITY;
244                }
245            }
246            return quality;
247        }
248
249        /***
250         * Disables preferences that are less secure than required quality.
251         *
252         * @param quality the requested quality.
253         */
254        private void disableUnusablePreferences(final int quality, MutableBoolean allowBiometric) {
255            final PreferenceScreen entries = getPreferenceScreen();
256            final boolean onlyShowFallback = getActivity().getIntent()
257                    .getBooleanExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, false);
258            final boolean weakBiometricAvailable =
259                    mChooseLockSettingsHelper.utils().isBiometricWeakInstalled();
260
261            // if there are multiple users, disable "None" setting
262            UserManager mUm = (UserManager) getSystemService(Context.USER_SERVICE);
263            List<UserInfo> users = mUm.getUsers(true);
264            final boolean singleUser = users.size() == 1;
265
266            for (int i = entries.getPreferenceCount() - 1; i >= 0; --i) {
267                Preference pref = entries.getPreference(i);
268                if (pref instanceof PreferenceScreen) {
269                    final String key = ((PreferenceScreen) pref).getKey();
270                    boolean enabled = true;
271                    boolean visible = true;
272                    if (KEY_UNLOCK_SET_OFF.equals(key)) {
273                        enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
274                        visible = singleUser; // don't show when there's more than 1 user
275                    } else if (KEY_UNLOCK_SET_NONE.equals(key)) {
276                        enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
277                    } else if (KEY_UNLOCK_SET_BIOMETRIC_WEAK.equals(key)) {
278                        enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK ||
279                                allowBiometric.value;
280                        visible = weakBiometricAvailable; // If not available, then don't show it.
281                    } else if (KEY_UNLOCK_SET_PATTERN.equals(key)) {
282                        enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
283                    } else if (KEY_UNLOCK_SET_PIN.equals(key)) {
284                        enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
285                    } else if (KEY_UNLOCK_SET_PASSWORD.equals(key)) {
286                        enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_COMPLEX;
287                    }
288                    if (!visible || (onlyShowFallback && !allowedForFallback(key))) {
289                        entries.removePreference(pref);
290                    } else if (!enabled) {
291                        pref.setSummary(R.string.unlock_set_unlock_disabled_summary);
292                        pref.setEnabled(false);
293                    }
294                }
295            }
296        }
297
298        /**
299         * Check whether the key is allowed for fallback (e.g. bio sensor). Returns true if it's
300         * supported as a backup.
301         *
302         * @param key
303         * @return true if allowed
304         */
305        private boolean allowedForFallback(String key) {
306            return KEY_UNLOCK_BACKUP_INFO.equals(key)  ||
307                    KEY_UNLOCK_SET_PATTERN.equals(key) || KEY_UNLOCK_SET_PIN.equals(key);
308        }
309
310        private Intent getBiometricSensorIntent() {
311            Intent fallBackIntent = new Intent().setClass(getActivity(),
312                    ChooseLockGeneric.InternalActivity.class);
313            fallBackIntent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, true);
314            fallBackIntent.putExtra(CONFIRM_CREDENTIALS, false);
315            fallBackIntent.putExtra(EXTRA_SHOW_FRAGMENT_TITLE,
316                    R.string.backup_lock_settings_picker_title);
317
318            boolean showTutorial = ALWAY_SHOW_TUTORIAL ||
319                    !mChooseLockSettingsHelper.utils().isBiometricWeakEverChosen();
320            Intent intent = new Intent();
321            intent.setClassName("com.android.facelock", "com.android.facelock.SetupIntro");
322            intent.putExtra("showTutorial", showTutorial);
323            PendingIntent pending = PendingIntent.getActivity(getActivity(), 0, fallBackIntent, 0);
324            intent.putExtra("PendingIntent", pending);
325            return intent;
326        }
327
328        /**
329         * Invokes an activity to change the user's pattern, password or PIN based on given quality
330         * and minimum quality specified by DevicePolicyManager. If quality is
331         * {@link DevicePolicyManager#PASSWORD_QUALITY_UNSPECIFIED}, password is cleared.
332         *
333         * @param quality the desired quality. Ignored if DevicePolicyManager requires more security
334         * @param disabled whether or not to show LockScreen at all. Only meaningful when quality is
335         * {@link DevicePolicyManager#PASSWORD_QUALITY_UNSPECIFIED}
336         */
337        void updateUnlockMethodAndFinish(int quality, boolean disabled) {
338            // Sanity check. We should never get here without confirming user's existing password.
339            if (!mPasswordConfirmed) {
340                throw new IllegalStateException("Tried to update password without confirming it");
341            }
342
343            final boolean isFallback = getActivity().getIntent()
344                .getBooleanExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, false);
345
346            quality = upgradeQuality(quality, null);
347
348            if (quality >= DevicePolicyManager.PASSWORD_QUALITY_NUMERIC) {
349                int minLength = mDPM.getPasswordMinimumLength(null);
350                if (minLength < MIN_PASSWORD_LENGTH) {
351                    minLength = MIN_PASSWORD_LENGTH;
352                }
353                final int maxLength = mDPM.getPasswordMaximumLength(quality);
354                Intent intent = new Intent().setClass(getActivity(), ChooseLockPassword.class);
355                intent.putExtra(LockPatternUtils.PASSWORD_TYPE_KEY, quality);
356                intent.putExtra(ChooseLockPassword.PASSWORD_MIN_KEY, minLength);
357                intent.putExtra(ChooseLockPassword.PASSWORD_MAX_KEY, maxLength);
358                intent.putExtra(CONFIRM_CREDENTIALS, false);
359                intent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK,
360                        isFallback);
361                if (isFallback) {
362                    startActivityForResult(intent, FALLBACK_REQUEST);
363                    return;
364                } else {
365                    mFinishPending = true;
366                    intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
367                    startActivity(intent);
368                }
369            } else if (quality == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) {
370                Intent intent = new Intent(getActivity(), ChooseLockPattern.class);
371                intent.putExtra("key_lock_method", "pattern");
372                intent.putExtra(CONFIRM_CREDENTIALS, false);
373                intent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK,
374                        isFallback);
375                if (isFallback) {
376                    startActivityForResult(intent, FALLBACK_REQUEST);
377                    return;
378                } else {
379                    mFinishPending = true;
380                    intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
381                    startActivity(intent);
382                }
383            } else if (quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK) {
384                Intent intent = getBiometricSensorIntent();
385                mFinishPending = true;
386                startActivity(intent);
387            } else if (quality == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
388                mChooseLockSettingsHelper.utils().clearLock(false);
389                mChooseLockSettingsHelper.utils().setLockScreenDisabled(disabled);
390                getActivity().setResult(Activity.RESULT_OK);
391                finish();
392            } else {
393                finish();
394            }
395        }
396
397        @Override
398        protected int getHelpResource() {
399            return R.string.help_url_choose_lockscreen;
400        }
401
402    }
403}
404