Add permission check to Intents used by Authenticator Settings.
Setting shares system uid and can be used to bypass different security
checks.
We add proper handling for intents which resolve toexported=true
activities with permission filed.
Added nested preferences filtering.
Bug: 33123882
Test: manual tests
Change-Id: Ib5bab7989fc44b4391f9050c6b18f81c58c09cf6
(cherry picked from commit e95f0fca72b4b231ca67b81ea214a943180fd54d)
diff --git a/src/com/android/settings/accounts/ManageAccountsSettings.java b/src/com/android/settings/accounts/ManageAccountsSettings.java
index bbb8c14..6fb16cc 100644
--- a/src/com/android/settings/accounts/ManageAccountsSettings.java
+++ b/src/com/android/settings/accounts/ManageAccountsSettings.java
@@ -36,6 +36,7 @@
import android.os.UserHandle;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
+import android.preference.PreferenceGroup;
import android.preference.PreferenceScreen;
import android.util.Log;
import android.view.LayoutInflater;
@@ -83,7 +84,7 @@
// If an account type is set, then show only accounts of that type
private String mAccountType;
- // Temporary hack, to deal with backward compatibility
+ // Temporary hack, to deal with backward compatibility
// mFirstAccount is used for the injected preferences
private Account mFirstAccount;
@@ -438,15 +439,18 @@
}
/**
- * Filters through the preference list provided by GoogleLoginService.
+ * Recursively filters through the preference list provided by GoogleLoginService.
*
* This method removes all the invalid intent from the list, adds account name as extra into the
* intent, and hack the location settings to start it as a fragment.
*/
- private void updatePreferenceIntents(PreferenceScreen prefs) {
+ private void updatePreferenceIntents(PreferenceGroup prefs) {
final PackageManager pm = getActivity().getPackageManager();
for (int i = 0; i < prefs.getPreferenceCount();) {
Preference pref = prefs.getPreference(i);
+ if (pref instanceof PreferenceGroup) {
+ updatePreferenceIntents((PreferenceGroup) pref);
+ }
Intent intent = pref.getIntent();
if (intent != null) {
// Hack. Launch "Location" as fragment instead of as activity.
@@ -495,8 +499,8 @@
} else {
Log.e(TAG,
"Refusing to launch authenticator intent because"
- + "it exploits Settings permissions: "
- + prefIntent);
+ + " it exploits Settings permissions: "
+ + prefIntent);
}
return true;
}
@@ -516,20 +520,26 @@
private boolean isSafeIntent(PackageManager pm, Intent intent) {
AuthenticatorDescription authDesc =
mAuthenticatorHelper.getAccountTypeDescription(mAccountType);
- ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
+ ResolveInfo resolveInfo =
+ pm.resolveActivityAsUser(intent, 0, mUserHandle.getIdentifier());
if (resolveInfo == null) {
return false;
}
ActivityInfo resolvedActivityInfo = resolveInfo.activityInfo;
ApplicationInfo resolvedAppInfo = resolvedActivityInfo.applicationInfo;
try {
+ if (resolvedActivityInfo.exported) {
+ if (resolvedActivityInfo.permission == null) {
+ return true; // exported activity without permission.
+ } else if (pm.checkPermission(resolvedActivityInfo.permission,
+ authDesc.packageName) == PackageManager.PERMISSION_GRANTED) {
+ return true;
+ }
+ }
ApplicationInfo authenticatorAppInf = pm.getApplicationInfo(authDesc.packageName, 0);
- return resolvedActivityInfo.exported
- || resolvedAppInfo.uid == authenticatorAppInf.uid;
+ return resolvedAppInfo.uid == authenticatorAppInf.uid;
} catch (NameNotFoundException e) {
- Log.e(TAG,
- "Intent considered unsafe due to exception.",
- e);
+ Log.e(TAG, "Intent considered unsafe due to exception.", e);
return false;
}
}
