}
/**
+ * Check if the calling UID has a possible chance at accessing the provider
+ * at the given authority and user.
+ */
+ public String checkContentProviderAccess(String authority, int userId) {
+ if (userId == UserHandle.USER_ALL) {
+ mContext.enforceCallingOrSelfPermission(
+ Manifest.permission.INTERACT_ACROSS_USERS_FULL, TAG);
+ userId = UserHandle.getCallingUserId();
+ }
+
+ ProviderInfo cpi = null;
+ try {
+ cpi = AppGlobals.getPackageManager().resolveContentProvider(authority,
+ STOCK_PM_FLAGS | PackageManager.GET_URI_PERMISSION_PATTERNS
+ | PackageManager.MATCH_DIRECT_BOOT_AWARE
+ | PackageManager.MATCH_DIRECT_BOOT_UNAWARE,
+ userId);
+ } catch (RemoteException ignored) {
+ }
+ if (cpi == null) {
+ // TODO: make this an outright failure in a future platform release;
+ // until then anonymous content notifications are unprotected
+ //return "Failed to find provider " + authority + " for user " + userId;
+ return null;
+ }
+
+ ProcessRecord r = null;
+ synchronized (mPidsSelfLocked) {
+ r = mPidsSelfLocked.get(Binder.getCallingPid());
+ }
+ if (r == null) {
+ return "Failed to find PID " + Binder.getCallingPid();
+ }
+
+ synchronized (this) {
+ return checkContentProviderPermissionLocked(cpi, r, userId, true);
+ }
+ }
+
+ /**
* Check if {@link ProcessRecord} has a possible chance at accessing the
* given {@link ProviderInfo}. Final permission checking is always done
* in {@link ContentProvider}.
private final class LocalService extends ActivityManagerInternal {
@Override
+ public String checkContentProviderAccess(String authority, int userId) {
+ return ActivityManagerService.this.checkContentProviderAccess(authority, userId);
+ }
+
+ @Override
public void onWakefulnessChanged(int wakefulness) {
ActivityManagerService.this.onWakefulnessChanged(wakefulness);
}
import android.accounts.Account;
import android.annotation.Nullable;
import android.app.ActivityManager;
+import android.app.ActivityManagerInternal;
import android.app.AppOpsManager;
import android.app.job.JobInfo;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
-import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.Context;
import android.content.IContentService;
import java.io.FileDescriptor;
import java.io.PrintWriter;
-import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
final int uid = Binder.getCallingUid();
final int pid = Binder.getCallingPid();
- final int callingUserHandle = UserHandle.getCallingUserId();
- // Registering an observer for any user other than the calling user requires uri grant or
- // cross user permission
- if (callingUserHandle != userHandle) {
- if (checkUriPermission(uri, pid, uid, Intent.FLAG_GRANT_READ_URI_PERMISSION, userHandle)
- != PackageManager.PERMISSION_GRANTED) {
- enforceCrossUserPermission(userHandle,
- "no permission to observe other users' provider view");
- }
- }
- if (userHandle < 0) {
- if (userHandle == UserHandle.USER_CURRENT) {
- userHandle = ActivityManager.getCurrentUser();
- } else if (userHandle != UserHandle.USER_ALL) {
- throw new InvalidParameterException("Bad user handle for registerContentObserver: "
- + userHandle);
- }
+ userHandle = handleIncomingUser(uri, pid, uid,
+ Intent.FLAG_GRANT_READ_URI_PERMISSION, userHandle);
+
+ final String msg = LocalServices.getService(ActivityManagerInternal.class)
+ .checkContentProviderAccess(uri.getAuthority(), userHandle);
+ if (msg != null) {
+ Log.w(TAG, "Ignoring content changes for " + uri + " from " + uid + ": " + msg);
+ return;
}
synchronized (mRootNode) {
final int uid = Binder.getCallingUid();
final int pid = Binder.getCallingPid();
final int callingUserHandle = UserHandle.getCallingUserId();
- // Notify for any user other than the caller requires uri grant or cross user permission
- if (callingUserHandle != userHandle) {
- if (checkUriPermission(uri, pid, uid, Intent.FLAG_GRANT_WRITE_URI_PERMISSION,
- userHandle) != PackageManager.PERMISSION_GRANTED) {
- enforceCrossUserPermission(userHandle, "no permission to notify other users");
- }
- }
- // We passed the permission check; resolve pseudouser targets as appropriate
- if (userHandle < 0) {
- if (userHandle == UserHandle.USER_CURRENT) {
- userHandle = ActivityManager.getCurrentUser();
- } else if (userHandle != UserHandle.USER_ALL) {
- throw new InvalidParameterException("Bad user handle for notifyChange: "
- + userHandle);
- }
+ userHandle = handleIncomingUser(uri, pid, uid,
+ Intent.FLAG_GRANT_WRITE_URI_PERMISSION, userHandle);
+
+ final String msg = LocalServices.getService(ActivityManagerInternal.class)
+ .checkContentProviderAccess(uri.getAuthority(), userHandle);
+ if (msg != null) {
+ Log.w(TAG, "Ignoring notify for " + uri + " from " + uid + ": " + msg);
+ return;
}
// This makes it so that future permission checks will be in the context of this
}
}
+ private int handleIncomingUser(Uri uri, int pid, int uid, int modeFlags, int userId) {
+ if (userId == UserHandle.USER_CURRENT) {
+ userId = ActivityManager.getCurrentUser();
+ }
+
+ if (userId == UserHandle.USER_ALL) {
+ mContext.enforceCallingOrSelfPermission(
+ Manifest.permission.INTERACT_ACROSS_USERS_FULL, TAG);
+ } else if (userId < 0) {
+ throw new IllegalArgumentException("Invalid user: " + userId);
+ } else if (userId != UserHandle.getCallingUserId()) {
+ if (checkUriPermission(uri, pid, uid, modeFlags,
+ userId) != PackageManager.PERMISSION_GRANTED) {
+ mContext.enforceCallingOrSelfPermission(
+ Manifest.permission.INTERACT_ACROSS_USERS_FULL, TAG);
+ }
+ }
+
+ return userId;
+ }
+
/**
* Checks if the request is from the system or an app that has INTERACT_ACROSS_USERS_FULL
* permission, if the userHandle is not for the caller.