Implement IntentFilter verification service.

This commit adds a verifier that verifies a host delegates permission for
an app to handle Url for the host using the Statement protocol.

- Implements the Statement protocol
-- The protocol defines a file format that represents statements.
-- The protocol defines where each asset type should put their statement
declaration. For web asset, the statement file should be hosted at
<scheme>://<host>:<port>/.well-known/associations.json.

- Implements IntentFilterVerificationReceiver, an interface between
StatementService and PackageManager. PackageManager will send a
broadcast with action Intent.ACTION_INTENT_FILTER_NEEDS_VERIFICATION.
The service will process the request and returns the results by calling
PackageManager.verifyIntentFilter().

To verify an IntentFilter like this defined in Android app com.test.app
<intent-filter>
  <data android:scheme="https" />
  <data android:host="www.test.com" />
  <data android:pathPattern=".*"/>
</intent-filter>

The service will try to retrieve the statement file from
https://www.test.com:443/.well-known/associations.json and try to find
a JSON object equivalent to
{'relation': ['delegate_permission/common.handle_all_urls'],
 'target': {'namespace': 'android_app',
            'package_name': 'com.test.app',
            'sha256_cert_fingerprints': [APP_CERT_FP]}}
The entry should have the correct relation, package name, and
certificate sha256 fingerprint.

Because this implementation will send a HTTP request for each host
specified in the intent-filter in AndroidManifest.xml, to avoid overwhelming
the network at app install time, we limit the maximum number of hosts we will
verify for a single app to 10. Any app with more than 10 hosts in the
autoVerify=true intent-filter won't be auto verified.

Change-Id: I787c9d176e4110aa441eb5fe4fa9651a071c6610

1 files changed, 51 insertions, 0 deletions

diff --git a/packages/StatementService/AndroidManifest.xml b/packages/StatementService/AndroidManifest.xml
new file mode 100644
index 0000000..3ee453b
--- /dev/null
+++ b/packages/StatementService/AndroidManifest.xml
@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+        package="com.android.statementservice"
+        android:versionCode="1"
+        android:versionName="1.0">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+    <uses-permission android:name="android.permission.INTENT_FILTER_VERIFICATION_AGENT"/>
+
+    <application
+            android:label="@string/service_name"
+            android:allowBackup="false">
+        <service
+                android:name=".DirectStatementService"
+                android:exported="false">
+            <intent-filter>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <action android:name="com.android.statementservice.aosp.service.CHECK_ACTION"/>
+            </intent-filter>
+        </service>
+
+        <receiver
+                android:name=".IntentFilterVerificationReceiver"
+                android:permission="android.permission.BIND_INTENT_FILTER_VERIFIER">
+            <!-- Set the priority 1 so newer implementation can have higher priority. -->
+            <intent-filter
+                    android:priority="1">
+                <action android:name="android.intent.action.INTENT_FILTER_NEEDS_VERIFICATION"/>
+                <data android:mimeType="application/vnd.android.package-archive"/>
+            </intent-filter>
+        </receiver>
+
+    </application>
+
+</manifest>