PackageManager: make protected-broadcasts permission aware

This extends the <protected-broadcast> mechanism to allow protecting
actions based on a permission for system apps.

For instance:

   <protected-broadcast android:name="ACTION_A"
                        android:permission="PERMISSION_X" />

will restrict intents with action "ACTION_A" to be only sent with
apps holding the "PERMISSION_X" permission. Note that system UIDs will
bypass the permission check and always be allowed, just like the normal
protected-broadcast mechanism.

You must still be a system application to delcare a protected broadcast.

Change-Id: Id25cffd233d400800dcb5249c5f487134e1b4152
Signed-off-by: Roman Birg <roman@cyngn.com>

2 files changed, 14 insertions, 4 deletions

diff --git a/core/java/android/content/pm/IPackageManager.aidl b/core/java/android/content/pm/IPackageManager.aidl
index a3329db..51f13af 100644
--- a/core/java/android/content/pm/IPackageManager.aidl
+++ b/core/java/android/content/pm/IPackageManager.aidl
@@ -523,4 +523,7 @@ interface IPackageManager {
     /** Protected Apps */
     boolean isComponentProtected(in String callingPackage, in int callingUid,
     in ComponentName componentName, int userId);
+
+    /** protected broadcast ext */
+    boolean isProtectedBroadcastAllowed(in String actionName, in int callingUid);
 }
diff --git a/core/java/android/content/pm/PackageParser.java b/core/java/android/content/pm/PackageParser.java
index 6a07b31..bb46ef0 100644
--- a/core/java/android/content/pm/PackageParser.java
+++ b/core/java/android/content/pm/PackageParser.java
@@ -1877,14 +1877,18 @@ public class PackageParser {
                 String name = sa.getNonResourceString(
                         com.android.internal.R.styleable.AndroidManifestProtectedBroadcast_name);
 
+                String permission = sa.getNonResourceString(
+                        com.android.internal.R.styleable.AndroidManifestProtectedBroadcast_permission);
+
                 sa.recycle();
 
                 if (name != null && (flags&PARSE_IS_SYSTEM) != 0) {
                     if (pkg.protectedBroadcasts == null) {
-                        pkg.protectedBroadcasts = new ArrayList<String>();
+                        pkg.protectedBroadcasts = new ArrayMap<>();
                     }
-                    if (!pkg.protectedBroadcasts.contains(name)) {
-                        pkg.protectedBroadcasts.add(name.intern());
+                    if (!pkg.protectedBroadcasts.containsKey(name)) {
+                        pkg.protectedBroadcasts.put(name.intern(),
+                                permission != null ? permission.intern() : null);
                     }
                 }
 
@@ -4519,7 +4523,10 @@ public class PackageParser {
 
         public final ArrayList<String> requestedPermissions = new ArrayList<String>();
 
-        public ArrayList<String> protectedBroadcasts;
+        /**
+         * Maps from package -> permission, null for system (default behavior)
+         */
+        public ArrayMap<String,String> protectedBroadcasts;
 
         public ArrayList<String> libraryNames = null;
         public ArrayList<String> usesLibraries = null;