/*
* Copyright (C) 2010 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.email;
import android.app.admin.DeviceAdminInfo;
import android.app.admin.DeviceAdminReceiver;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.util.Log;
import com.android.email.service.EmailBroadcastProcessorService;
import com.android.emailcommon.Logging;
import com.android.emailcommon.provider.Account;
import com.android.emailcommon.provider.EmailContent;
import com.android.emailcommon.provider.EmailContent.AccountColumns;
import com.android.emailcommon.provider.EmailContent.PolicyColumns;
import com.android.emailcommon.provider.Policy;
import com.android.emailcommon.utility.Utility;
import com.google.common.annotations.VisibleForTesting;
/**
* Utility functions to support reading and writing security policies, and handshaking the device
* into and out of various security states.
*/
public class SecurityPolicy {
private static final String TAG = "Email/SecurityPolicy";
private static SecurityPolicy sInstance = null;
private Context mContext;
private DevicePolicyManager mDPM;
private final ComponentName mAdminName;
private Policy mAggregatePolicy;
// Messages used for DevicePolicyManager callbacks
private static final int DEVICE_ADMIN_MESSAGE_ENABLED = 1;
private static final int DEVICE_ADMIN_MESSAGE_DISABLED = 2;
private static final int DEVICE_ADMIN_MESSAGE_PASSWORD_CHANGED = 3;
private static final int DEVICE_ADMIN_MESSAGE_PASSWORD_EXPIRING = 4;
private static final String HAS_PASSWORD_EXPIRATION =
PolicyColumns.PASSWORD_EXPIRATION_DAYS + ">0";
/**
* Get the security policy instance
*/
public synchronized static SecurityPolicy getInstance(Context context) {
if (sInstance == null) {
sInstance = new SecurityPolicy(context.getApplicationContext());
}
return sInstance;
}
/**
* Private constructor (one time only)
*/
private SecurityPolicy(Context context) {
mContext = context.getApplicationContext();
mDPM = null;
mAdminName = new ComponentName(context, PolicyAdmin.class);
mAggregatePolicy = null;
}
/**
* For testing only: Inject context into already-created instance
*/
/* package */ void setContext(Context context) {
mContext = context;
}
/**
* Compute the aggregate policy for all accounts that require it, and record it.
*
* The business logic is as follows:
* min password length take the max
* password mode take the max (strongest mode)
* max password fails take the min
* max screen lock time take the min
* require remote wipe take the max (logical or)
* password history take the max (strongest mode)
* password expiration take the min (strongest mode)
* password complex chars take the max (strongest mode)
* encryption take the max (logical or)
*
* @return a policy representing the strongest aggregate. If no policy sets are defined,
* a lightweight "nothing required" policy will be returned. Never null.
*/
@VisibleForTesting
Policy computeAggregatePolicy() {
boolean policiesFound = false;
Policy aggregate = new Policy();
aggregate.mPasswordMinLength = Integer.MIN_VALUE;
aggregate.mPasswordMode = Integer.MIN_VALUE;
aggregate.mPasswordMaxFails = Integer.MAX_VALUE;
aggregate.mPasswordHistory = Integer.MIN_VALUE;
aggregate.mPasswordExpirationDays = Integer.MAX_VALUE;
aggregate.mPasswordComplexChars = Integer.MIN_VALUE;
aggregate.mMaxScreenLockTime = Integer.MAX_VALUE;
aggregate.mRequireRemoteWipe = false;
aggregate.mRequireEncryption = false;
// This can never be supported at this time. It exists only for historic reasons where
// this was able to be supported prior to the introduction of proper removable storage
// support for external storage.
aggregate.mRequireEncryptionExternal = false;
Cursor c = mContext.getContentResolver().query(Policy.CONTENT_URI,
Policy.CONTENT_PROJECTION, null, null, null);
Policy policy = new Policy();
try {
while (c.moveToNext()) {
policy.restore(c);
if (Email.DEBUG) {
Log.d(TAG, "Aggregate from: " + policy);
}
aggregate.mPasswordMinLength =
Math.max(policy.mPasswordMinLength, aggregate.mPasswordMinLength);
aggregate.mPasswordMode = Math.max(policy.mPasswordMode, aggregate.mPasswordMode);
if (policy.mPasswordMaxFails > 0) {
aggregate.mPasswordMaxFails =
Math.min(policy.mPasswordMaxFails, aggregate.mPasswordMaxFails);
}
if (policy.mMaxScreenLockTime > 0) {
aggregate.mMaxScreenLockTime = Math.min(policy.mMaxScreenLockTime,
aggregate.mMaxScreenLockTime);
}
if (policy.mPasswordHistory > 0) {
aggregate.mPasswordHistory =
Math.max(policy.mPasswordHistory, aggregate.mPasswordHistory);
}
if (policy.mPasswordExpirationDays > 0) {
aggregate.mPasswordExpirationDays =
Math.min(policy.mPasswordExpirationDays, aggregate.mPasswordExpirationDays);
}
if (policy.mPasswordComplexChars > 0) {
aggregate.mPasswordComplexChars = Math.max(policy.mPasswordComplexChars,
aggregate.mPasswordComplexChars);
}
aggregate.mRequireRemoteWipe |= policy.mRequireRemoteWipe;
aggregate.mRequireEncryption |= policy.mRequireEncryption;
aggregate.mDontAllowCamera |= policy.mDontAllowCamera;
policiesFound = true;
}
} finally {
c.close();
}
if (policiesFound) {
// final cleanup pass converts any untouched min/max values to zero (not specified)
if (aggregate.mPasswordMinLength == Integer.MIN_VALUE) aggregate.mPasswordMinLength = 0;
if (aggregate.mPasswordMode == Integer.MIN_VALUE) aggregate.mPasswordMode = 0;
if (aggregate.mPasswordMaxFails == Integer.MAX_VALUE) aggregate.mPasswordMaxFails = 0;
if (aggregate.mMaxScreenLockTime == Integer.MAX_VALUE) aggregate.mMaxScreenLockTime = 0;
if (aggregate.mPasswordHistory == Integer.MIN_VALUE) aggregate.mPasswordHistory = 0;
if (aggregate.mPasswordExpirationDays == Integer.MAX_VALUE)
aggregate.mPasswordExpirationDays = 0;
if (aggregate.mPasswordComplexChars == Integer.MIN_VALUE)
aggregate.mPasswordComplexChars = 0;
if (Email.DEBUG) {
Log.d(TAG, "Calculated Aggregate: " + aggregate);
}
return aggregate;
}
if (Email.DEBUG) {
Log.d(TAG, "Calculated Aggregate: no policy");
}
return Policy.NO_POLICY;
}
/**
* Return updated aggregate policy, from cached value if possible
*/
public synchronized Policy getAggregatePolicy() {
if (mAggregatePolicy == null) {
mAggregatePolicy = computeAggregatePolicy();
}
return mAggregatePolicy;
}
/**
* Get the dpm. This mainly allows us to make some utility calls without it, for testing.
*/
/* package */ synchronized DevicePolicyManager getDPM() {
if (mDPM == null) {
mDPM = (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
}
return mDPM;
}
/**
* API: Report that policies may have been updated due to rewriting values in an Account.
* @param accountId the account that has been updated, -1 if unknown/deleted
*/
public synchronized void policiesUpdated(long accountId) {
mAggregatePolicy = null;
}
/**
* API: Report that policies may have been updated *and* the caller vouches that the
* change is a reduction in policies. This forces an immediate change to device state.
* Typically used when deleting accounts, although we may use it for server-side policy
* rollbacks.
*/
public void reducePolicies() {
if (Email.DEBUG) {
Log.d(TAG, "reducePolicies");
}
policiesUpdated(-1);
setActivePolicies();
}
/**
* API: Query if the proposed set of policies are supported on the device.
*
* @param policy the polices that were requested
* @return boolean if supported
*/
public boolean isSupported(Policy policy) {
// IMPLEMENTATION: At this time, the only policy which might not be supported is
// encryption (which requires low-level systems support). Other policies are fully
// supported by the framework and do not need to be checked.
if (policy.mRequireEncryption) {
int encryptionStatus = getDPM().getStorageEncryptionStatus();
if (encryptionStatus == DevicePolicyManager.ENCRYPTION_STATUS_UNSUPPORTED) {
return false;
}
}
// If we ever support devices that can't disable cameras for any reason, we should
// indicate as such in the mDontAllowCamera policy
return true;
}
/**
* API: Remove any unsupported policies
*
* This is used when we have a set of polices that have been requested, but the server
* is willing to allow unsupported policies to be considered optional.
*
* @param policy the polices that were requested
* @return the same PolicySet if all are supported; A replacement PolicySet if any
* unsupported policies were removed
*/
public Policy clearUnsupportedPolicies(Policy policy) {
// IMPLEMENTATION: At this time, the only policy which might not be supported is
// encryption (which requires low-level systems support). Other policies are fully
// supported by the framework and do not need to be checked.
if (policy.mRequireEncryption) {
int encryptionStatus = getDPM().getStorageEncryptionStatus();
if (encryptionStatus == DevicePolicyManager.ENCRYPTION_STATUS_UNSUPPORTED) {
policy.mRequireEncryption = false;
}
}
// If we ever support devices that can't disable cameras for any reason, we should
// clear the mDontAllowCamera policy
return policy;
}
/**
* API: Query used to determine if a given policy is "active" (the device is operating at
* the required security level).
*
* @param policy the policies requested, or null to check aggregate stored policies
* @return true if the requested policies are active, false if not.
*/
public boolean isActive(Policy policy) {
int reasons = getInactiveReasons(policy);
if (Email.DEBUG && (reasons != 0)) {
StringBuilder sb = new StringBuilder("isActive for " + policy + ": ");
if (reasons == 0) {
sb.append("true");
} else {
sb.append("FALSE -> ");
}
if ((reasons & INACTIVE_NEED_ACTIVATION) != 0) {
sb.append("no_admin ");
}
if ((reasons & INACTIVE_NEED_CONFIGURATION) != 0) {
sb.append("config ");
}
if ((reasons & INACTIVE_NEED_PASSWORD) != 0) {
sb.append("password ");
}
if ((reasons & INACTIVE_NEED_ENCRYPTION) != 0) {
sb.append("encryption ");
}
Log.d(TAG, sb.toString());
}
return reasons == 0;
}
/**
* Return bits from isActive: Device Policy Manager has not been activated
*/
public final static int INACTIVE_NEED_ACTIVATION = 1;
/**
* Return bits from isActive: Some required configuration is not correct (no user action).
*/
public final static int INACTIVE_NEED_CONFIGURATION = 2;
/**
* Return bits from isActive: Password needs to be set or updated
*/
public final static int INACTIVE_NEED_PASSWORD = 4;
/**
* Return bits from isActive: Encryption has not be enabled
*/
public final static int INACTIVE_NEED_ENCRYPTION = 8;
/**
* API: Query used to determine if a given policy is "active" (the device is operating at
* the required security level).
*
* This can be used when syncing a specific account, by passing a specific set of policies
* for that account. Or, it can be used at any time to compare the device
* state against the aggregate set of device policies stored in all accounts.
*
* This method is for queries only, and does not trigger any change in device state.
*
* NOTE: If there are multiple accounts with password expiration policies, the device
* password will be set to expire in the shortest required interval (most secure). This method
* will return 'false' as soon as the password expires - irrespective of which account caused
* the expiration. In other words, all accounts (that require expiration) will run/stop
* based on the requirements of the account with the shortest interval.
*
* @param policy the policies requested, or null to check aggregate stored policies
* @return zero if the requested policies are active, non-zero bits indicates that more work
* is needed (typically, by the user) before the required security polices are fully active.
*/
public int getInactiveReasons(Policy policy) {
// select aggregate set if needed
if (policy == null) {
policy = getAggregatePolicy();
}
// quick check for the "empty set" of no policies
if (policy == Policy.NO_POLICY) {
return 0;
}
int reasons = 0;
DevicePolicyManager dpm = getDPM();
if (isActiveAdmin()) {
// check each policy explicitly
if (policy.mPasswordMinLength > 0) {
if (dpm.getPasswordMinimumLength(mAdminName) < policy.mPasswordMinLength) {
reasons |= INACTIVE_NEED_PASSWORD;
}
}
if (policy.mPasswordMode > 0) {
if (dpm.getPasswordQuality(mAdminName) < policy.getDPManagerPasswordQuality()) {
reasons |= INACTIVE_NEED_PASSWORD;
}
if (!dpm.isActivePasswordSufficient()) {
reasons |= INACTIVE_NEED_PASSWORD;
}
}
if (policy.mMaxScreenLockTime > 0) {
// Note, we use seconds, dpm uses milliseconds
if (dpm.getMaximumTimeToLock(mAdminName) > policy.mMaxScreenLockTime * 1000) {
reasons |= INACTIVE_NEED_CONFIGURATION;
}
}
if (policy.mPasswordExpirationDays > 0) {
// confirm that expirations are currently set
long currentTimeout = dpm.getPasswordExpirationTimeout(mAdminName);
if (currentTimeout == 0
|| currentTimeout > policy.getDPManagerPasswordExpirationTimeout()) {
reasons |= INACTIVE_NEED_PASSWORD;
}
// confirm that the current password hasn't expired
long expirationDate = dpm.getPasswordExpiration(mAdminName);
long timeUntilExpiration = expirationDate - System.currentTimeMillis();
boolean expired = timeUntilExpiration < 0;
if (expired) {
reasons |= INACTIVE_NEED_PASSWORD;
}
}
if (policy.mPasswordHistory > 0) {
if (dpm.getPasswordHistoryLength(mAdminName) < policy.mPasswordHistory) {
// There's no user action for changes here; this is just a configuration change
reasons |= INACTIVE_NEED_CONFIGURATION;
}
}
if (policy.mPasswordComplexChars > 0) {
if (dpm.getPasswordMinimumNonLetter(mAdminName) < policy.mPasswordComplexChars) {
reasons |= INACTIVE_NEED_PASSWORD;
}
}
if (policy.mRequireEncryption) {
int encryptionStatus = getDPM().getStorageEncryptionStatus();
if (encryptionStatus != DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE) {
reasons |= INACTIVE_NEED_ENCRYPTION;
}
}
if (policy.mDontAllowCamera && !dpm.getCameraDisabled(mAdminName)) {
reasons |= INACTIVE_NEED_CONFIGURATION;
}
// password failures are counted locally - no test required here
// no check required for remote wipe (it's supported, if we're the admin)
// If we made it all the way, reasons == 0 here. Otherwise it's a list of grievances.
return reasons;
}
// return false, not active
return INACTIVE_NEED_ACTIVATION;
}
/**
* Set the requested security level based on the aggregate set of requests.
* If the set is empty, we release our device administration. If the set is non-empty,
* we only proceed if we are already active as an admin.
*/
public void setActivePolicies() {
DevicePolicyManager dpm = getDPM();
// compute aggregate set of policies
Policy aggregatePolicy = getAggregatePolicy();
// if empty set, detach from policy manager
if (aggregatePolicy == Policy.NO_POLICY) {
if (Email.DEBUG) {
Log.d(TAG, "setActivePolicies: none, remove admin");
}
dpm.removeActiveAdmin(mAdminName);
} else if (isActiveAdmin()) {
if (Email.DEBUG) {
Log.d(TAG, "setActivePolicies: " + aggregatePolicy);
}
// set each policy in the policy manager
// password mode & length
dpm.setPasswordQuality(mAdminName, aggregatePolicy.getDPManagerPasswordQuality());
dpm.setPasswordMinimumLength(mAdminName, aggregatePolicy.mPasswordMinLength);
// screen lock time
dpm.setMaximumTimeToLock(mAdminName, aggregatePolicy.mMaxScreenLockTime * 1000);
// local wipe (failed passwords limit)
dpm.setMaximumFailedPasswordsForWipe(mAdminName, aggregatePolicy.mPasswordMaxFails);
// password expiration (days until a password expires). API takes mSec.
dpm.setPasswordExpirationTimeout(mAdminName,
aggregatePolicy.getDPManagerPasswordExpirationTimeout());
// password history length (number of previous passwords that may not be reused)
dpm.setPasswordHistoryLength(mAdminName, aggregatePolicy.mPasswordHistory);
// password minimum complex characters.
// Note, in Exchange, "complex chars" simply means "non alpha", but in the DPM,
// setting the quality to complex also defaults min symbols=1 and min numeric=1.
// We always / safely clear minSymbols & minNumeric to zero (there is no policy
// configuration in which we explicitly require a minimum number of digits or symbols.)
dpm.setPasswordMinimumSymbols(mAdminName, 0);
dpm.setPasswordMinimumNumeric(mAdminName, 0);
dpm.setPasswordMinimumNonLetter(mAdminName, aggregatePolicy.mPasswordComplexChars);
// Device capabilities
dpm.setCameraDisabled(mAdminName, aggregatePolicy.mDontAllowCamera);
// encryption required
dpm.setStorageEncryption(mAdminName, aggregatePolicy.mRequireEncryption);
}
}
/**
* Convenience method; see javadoc below
*/
public static void setAccountHoldFlag(Context context, long accountId, boolean newState) {
Account account = Account.restoreAccountWithId(context, accountId);
if (account != null) {
setAccountHoldFlag(context, account, newState);
}
}
/**
* API: Set/Clear the "hold" flag in any account. This flag serves a dual purpose:
* Setting it gives us an indication that it was blocked, and clearing it gives EAS a
* signal to try syncing again.
* @param context
* @param account the account whose hold flag is to be set/cleared
* @param newState true = security hold, false = free to sync
*/
public static void setAccountHoldFlag(Context context, Account account, boolean newState) {
if (newState) {
account.mFlags |= Account.FLAGS_SECURITY_HOLD;
} else {
account.mFlags &= ~Account.FLAGS_SECURITY_HOLD;
}
ContentValues cv = new ContentValues();
cv.put(AccountColumns.FLAGS, account.mFlags);
account.update(context, cv);
}
/**
* API: Sync service should call this any time a sync fails due to isActive() returning false.
* This will kick off the notify-acquire-admin-state process and/or increase the security level.
* The caller needs to write the required policies into this account before making this call.
* Should not be called from UI thread - uses DB lookups to prepare new notifications
*
* @param accountId the account for which sync cannot proceed
*/
public void policiesRequired(long accountId) {
Account account = Account.restoreAccountWithId(mContext, accountId);
// In case the account has been deleted, just return
if (account == null) return;
if (Email.DEBUG) {
if (account.mPolicyKey == 0) {
Log.d(TAG, "policiesRequired for " + account.mDisplayName + ": none");
} else {
Policy policy = Policy.restorePolicyWithId(mContext, account.mPolicyKey);
if (policy == null) {
Log.w(TAG, "No policy??");
} else {
Log.d(TAG, "policiesRequired for " + account.mDisplayName + ": " + policy);
}
}
}
// Mark the account as "on hold".
setAccountHoldFlag(mContext, account, true);
// Put up a notification
NotificationController.getInstance(mContext).showSecurityNeededNotification(account);
}
/**
* Called from the notification's intent receiver to register that the notification can be
* cleared now.
*/
public void clearNotification() {
NotificationController.getInstance(mContext).cancelSecurityNeededNotification();
}
/**
* API: Remote wipe (from server). This is final, there is no confirmation. It will only
* return to the caller if there is an unexpected failure. The wipe includes external storage.
*/
public void remoteWipe() {
DevicePolicyManager dpm = getDPM();
if (dpm.isAdminActive(mAdminName)) {
dpm.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE);
} else {
Log.d(Logging.LOG_TAG, "Could not remote wipe because not device admin.");
}
}
/**
* If we are not the active device admin, try to become so.
*
* Also checks for any policies that we have added during the lifetime of this app.
* This catches the case where the user granted an earlier (smaller) set of policies
* but an app upgrade requires that new policies be granted.
*
* @return true if we are already active, false if we are not
*/
public boolean isActiveAdmin() {
DevicePolicyManager dpm = getDPM();
return dpm.isAdminActive(mAdminName)
&& dpm.hasGrantedPolicy(mAdminName, DeviceAdminInfo.USES_POLICY_EXPIRE_PASSWORD)
&& dpm.hasGrantedPolicy(mAdminName, DeviceAdminInfo.USES_ENCRYPTED_STORAGE)
&& dpm.hasGrantedPolicy(mAdminName, DeviceAdminInfo.USES_POLICY_DISABLE_CAMERA);
}
/**
* Report admin component name - for making calls into device policy manager
*/
public ComponentName getAdminComponent() {
return mAdminName;
}
/**
* Delete all accounts whose security flags aren't zero (i.e. they have security enabled).
* This method is synchronous, so it should normally be called within a worker thread (the
* exception being for unit tests)
*
* @param context the caller's context
*/
/*package*/ void deleteSecuredAccounts(Context context) {
ContentResolver cr = context.getContentResolver();
// Find all accounts with security and delete them
Cursor c = cr.query(Account.CONTENT_URI, EmailContent.ID_PROJECTION,
Account.SECURITY_NONZERO_SELECTION, null, null);
try {
Log.w(TAG, "Email administration disabled; deleting " + c.getCount() +
" secured account(s)");
while (c.moveToNext()) {
Controller.getInstance(context).deleteAccountSync(
c.getLong(EmailContent.ID_PROJECTION_COLUMN), context);
}
} finally {
c.close();
}
policiesUpdated(-1);
}
/**
* Internal handler for enabled->disabled transitions. Deletes all secured accounts.
* Must call from worker thread, not on UI thread.
*/
/*package*/ void onAdminEnabled(boolean isEnabled) {
if (!isEnabled) {
deleteSecuredAccounts(mContext);
}
}
/**
* Handle password expiration - if any accounts appear to have triggered this, put up
* warnings, or even shut them down.
*
* NOTE: If there are multiple accounts with password expiration policies, the device
* password will be set to expire in the shortest required interval (most secure). The logic
* in this method operates based on the aggregate setting - irrespective of which account caused
* the expiration. In other words, all accounts (that require expiration) will run/stop
* based on the requirements of the account with the shortest interval.
*/
private void onPasswordExpiring(Context context) {
// 1. Do we have any accounts that matter here?
long nextExpiringAccountId = findShortestExpiration(context);
// 2. If not, exit immediately
if (nextExpiringAccountId == -1) {
return;
}
// 3. If yes, are we warning or expired?
long expirationDate = getDPM().getPasswordExpiration(mAdminName);
long timeUntilExpiration = expirationDate - System.currentTimeMillis();
boolean expired = timeUntilExpiration < 0;
if (!expired) {
// 4. If warning, simply put up a generic notification and report that it came from
// the shortest-expiring account.
NotificationController.getInstance(mContext).showPasswordExpiringNotification(
nextExpiringAccountId);
} else {
// 5. Actually expired - find all accounts that expire passwords, and wipe them
boolean wiped = wipeExpiredAccounts(context, Controller.getInstance(context));
if (wiped) {
NotificationController.getInstance(mContext).showPasswordExpiredNotification(
nextExpiringAccountId);
}
}
}
/**
* Find the account with the shortest expiration time. This is always assumed to be
* the account that forces the password to be refreshed.
* @return -1 if no expirations, or accountId if one is found
*/
@VisibleForTesting
/*package*/ static long findShortestExpiration(Context context) {
long policyId = Utility.getFirstRowLong(context, Policy.CONTENT_URI, Policy.ID_PROJECTION,
HAS_PASSWORD_EXPIRATION, null, PolicyColumns.PASSWORD_EXPIRATION_DAYS + " ASC",
EmailContent.ID_PROJECTION_COLUMN, -1L);
if (policyId < 0) return -1L;
return Policy.getAccountIdWithPolicyKey(context, policyId);
}
/**
* For all accounts that require password expiration, put them in security hold and wipe
* their data.
* @param context
* @param controller
* @return true if one or more accounts were wiped
*/
@VisibleForTesting
/*package*/ static boolean wipeExpiredAccounts(Context context, Controller controller) {
boolean result = false;
Cursor c = context.getContentResolver().query(Policy.CONTENT_URI,
Policy.ID_PROJECTION, HAS_PASSWORD_EXPIRATION, null, null);
try {
while (c.moveToNext()) {
long policyId = c.getLong(Policy.ID_PROJECTION_COLUMN);
long accountId = Policy.getAccountIdWithPolicyKey(context, policyId);
if (accountId < 0) continue;
Account account = Account.restoreAccountWithId(context, accountId);
if (account != null) {
// Mark the account as "on hold".
setAccountHoldFlag(context, account, true);
// Erase data
controller.deleteSyncedDataSync(accountId);
// Report one or more were found
result = true;
}
}
} finally {
c.close();
}
return result;
}
/**
* Callback from EmailBroadcastProcessorService. This provides the workers for the
* DeviceAdminReceiver calls. These should perform the work directly and not use async
* threads for completion.
*/
public static void onDeviceAdminReceiverMessage(Context context, int message) {
SecurityPolicy instance = SecurityPolicy.getInstance(context);
switch (message) {
case DEVICE_ADMIN_MESSAGE_ENABLED:
instance.onAdminEnabled(true);
break;
case DEVICE_ADMIN_MESSAGE_DISABLED:
instance.onAdminEnabled(false);
break;
case DEVICE_ADMIN_MESSAGE_PASSWORD_CHANGED:
// TODO make a small helper for this
// Clear security holds (if any)
Account.clearSecurityHoldOnAllAccounts(context);
// Cancel any active notifications (if any are posted)
NotificationController.getInstance(context).cancelPasswordExpirationNotifications();
break;
case DEVICE_ADMIN_MESSAGE_PASSWORD_EXPIRING:
instance.onPasswordExpiring(instance.mContext);
break;
}
}
/**
* Device Policy administrator. This is primarily a listener for device state changes.
* Note: This is instantiated by incoming messages.
* Note: This is actually a BroadcastReceiver and must remain within the guidelines required
* for proper behavior, including avoidance of ANRs.
* Note: We do not implement onPasswordFailed() because the default behavior of the
* DevicePolicyManager - complete local wipe after 'n' failures - is sufficient.
*/
public static class PolicyAdmin extends DeviceAdminReceiver {
/**
* Called after the administrator is first enabled.
*/
@Override
public void onEnabled(Context context, Intent intent) {
EmailBroadcastProcessorService.processDevicePolicyMessage(context,
DEVICE_ADMIN_MESSAGE_ENABLED);
}
/**
* Called prior to the administrator being disabled.
*/
@Override
public void onDisabled(Context context, Intent intent) {
EmailBroadcastProcessorService.processDevicePolicyMessage(context,
DEVICE_ADMIN_MESSAGE_DISABLED);
}
/**
* Called when the user asks to disable administration; we return a warning string that
* will be presented to the user
*/
@Override
public CharSequence onDisableRequested(Context context, Intent intent) {
return context.getString(R.string.disable_admin_warning);
}
/**
* Called after the user has changed their password.
*/
@Override
public void onPasswordChanged(Context context, Intent intent) {
EmailBroadcastProcessorService.processDevicePolicyMessage(context,
DEVICE_ADMIN_MESSAGE_PASSWORD_CHANGED);
}
/**
* Called when device password is expiring
*/
@Override
public void onPasswordExpiring(Context context, Intent intent) {
EmailBroadcastProcessorService.processDevicePolicyMessage(context,
DEVICE_ADMIN_MESSAGE_PASSWORD_EXPIRING);
}
}
}