Add BinaryTransparencyService as new SystemService.

Bug: 197684182

Created a new system service that aggregates information about:
1) signed partitions on device
2) APEXs installed on device
3) Modules installed on device

Introduces new adb shell commands as below:
adb shell cmd transparency get image_info [-a]
adb shell cmd transparency get apex_info [-v]
adb shell cmd transparency get module_info [-v]

Test: Built and tested locally on a bramble - the device boots.
Issuing adb shell commands as above provides correct outputs.

Change-Id: I2cae1bd794456688779c70c65b3f5ec8bcd7c6b3

1 files changed, 83 insertions, 0 deletions

diff --git a/core/java/android/transparency/BinaryTransparencyManager.java b/core/java/android/transparency/BinaryTransparencyManager.java
new file mode 100644
index 000000000000..18783f507085
--- /dev/null
+++ b/core/java/android/transparency/BinaryTransparencyManager.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2022 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 android.transparency;
+
+import android.annotation.NonNull;
+import android.annotation.SystemService;
+import android.content.Context;
+import android.os.RemoteException;
+import android.util.Slog;
+
+import com.android.internal.os.IBinaryTransparencyService;
+
+import java.util.Map;
+
+/**
+ * BinaryTransparencyManager defines a number of system interfaces that other system apps or
+ * services can make use of, when trying to get more information about the various binaries
+ * that are installed on this device.
+ * @hide
+ */
+@SystemService(Context.BINARY_TRANSPARENCY_SERVICE)
+public class BinaryTransparencyManager {
+    private static final String TAG = "TransparencyManager";
+
+    private final Context mContext;
+    private final IBinaryTransparencyService mService;
+
+    /**
+     * Constructor
+     * @param context The calling context.
+     * @param service A valid instance of IBinaryTransparencyService.
+     * @hide
+     */
+    public BinaryTransparencyManager(Context context, IBinaryTransparencyService service) {
+        mContext = context;
+        mService = service;
+    }
+
+
+    /**
+     * Obtains a string containing information that describes the signed images that are installed
+     * on this device. Currently, this piece of information is identified as the VBMeta digest.
+     * @return A String containing the VBMeta Digest of the signed partitions loaded on this device.
+     */
+    @NonNull
+    public String getSignedImageInfo() {
+        try {
+            return mService.getSignedImageInfo();
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
+    /**
+     * Returns a map of all installed APEXs consisting of package name to SHA256 hash of the
+     * package.
+     * @return A Map with the following entries: {apex package name : sha256 digest of package}
+     */
+    @NonNull
+    public Map getApexInfo() {
+        try {
+            Slog.d(TAG, "Calling backend's getApexInfo()");
+            return mService.getApexInfo();
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
+}