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430420b Dec 16, 2016
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From 7357f8c0c8a6bdc09555ab47dae83f28346b8470 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beno=C3=AEt=20Mauduit?= <bmauduit@beneth.fr>
Date: Wed, 22 Jun 2016 15:04:56 +0200
Subject: [PATCH 1/1] Add signature Spoofing permission
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This is needed by GmsCore (https://microg.org/) to pretend
the existence of the official Play Services to applications calling
Google APIs.
Signed-off-by: Benoît Mauduit <bmauduit@beneth.fr>
---
core/res/AndroidManifest.xml | 7 +++++++
core/res/res/values/config.xml | 2 ++
core/res/res/values/strings.xml | 5 +++++
.../android/server/pm/PackageManagerService.java | 23 ++++++++++++++++++++--
4 files changed, 35 insertions(+), 2 deletions(-)
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index ea0e39c..a936983 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1654,6 +1654,13 @@
android:description="@string/permdesc_getPackageSize"
android:protectionLevel="normal" />
+ <!-- @hide Allows an application to change the package signature as
+ seen by applications -->
+ <permission android:name="android.permission.FAKE_PACKAGE_SIGNATURE"
+ android:protectionLevel="dangerous"
+ android:label="@string/permlab_fakePackageSignature"
+ android:description="@string/permdesc_fakePackageSignature" />
+
<!-- @deprecated No longer useful, see
{@link android.content.pm.PackageManager#addPackageToPreferred}
for details. -->
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index c7846cf..916d8a5 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -1298,6 +1298,8 @@
<string-array name="config_locationProviderPackageNames" translatable="false">
<!-- The standard AOSP fused location provider -->
<item>com.android.location.fused</item>
+ <!-- The (faked) microg fused location provider -->
+ <item>com.google.android.gms</item>
</string-array>
<!-- This string array can be overriden to enable test location providers initially. -->
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 58135db..e65367a 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -616,6 +616,11 @@
<!-- Permissions -->
<!-- Title of an application permission, listed so the user can choose whether they want to allow the application to do this. -->
+ <string name="permlab_fakePackageSignature">Spoof package signature</string>
+ <!-- Description of an application permission, listed so the user can choose whether they want to allow the application to do this. -->
+ <string name="permdesc_fakePackageSignature">Allows the app to pretend to be a different app. Malicious applications might be able to use this to access private application data. Grant this permission with caution only!</string>
+
+ <!-- Title of an application permission, listed so the user can choose whether they want to allow the application to do this. -->
<string name="permlab_statusBar">disable or modify status bar</string>
<!-- Description of an application permission, listed so the user can choose whether they want to allow the application to do this. -->
<string name="permdesc_statusBar">Allows the app to disable the status bar or add and remove system icons.</string>
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 0493180..35f49d7 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -3067,8 +3067,27 @@ public class PackageManagerService extends IPackageManager.Stub {
? Collections.<String>emptySet() : permissionsState.getPermissions(userId);
final PackageUserState state = ps.readUserState(userId);
- return PackageParser.generatePackageInfo(p, gids, flags,
- ps.firstInstallTime, ps.lastUpdateTime, permissions, state, userId);
+ return mayFakeSignature(p, PackageParser.generatePackageInfo(p, gids, flags,
+ ps.firstInstallTime, ps.lastUpdateTime, permissions, state, userId),
+ permissions);
+ }
+
+ private PackageInfo mayFakeSignature(PackageParser.Package p, PackageInfo pi,
+ Set<String> permissions) {
+ try {
+ if (permissions.contains("android.permission.FAKE_PACKAGE_SIGNATURE")
+ && p.applicationInfo.targetSdkVersion > Build.VERSION_CODES.LOLLIPOP_MR1
+ && p.mAppMetaData != null) {
+ String sig = p.mAppMetaData.getString("fake-signature");
+ if (sig != null) {
+ pi.signatures = new Signature[] {new Signature(sig)};
+ }
+ }
+ } catch (Throwable t) {
+ // We should never die because of any failures, this is system code!
+ Log.w("PackageManagerService.FAKE_PACKAGE_SIGNATURE", t);
+ }
+ return pi;
}
@Override
--
2.8.1