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Code Issues

Use the appropriate signature spoofing patch

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This commit is contained in:
Nicola Corna 2017-07-30 18:10:47 +02:00
parent d74ec09989
commit fba75880fa
5 changed files with 207 additions and 13 deletions
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14
Dockerfile
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@ -71,9 +71,15 @@ ENV SIGN_BUILDS false
# Move the resulting zips to $ZIP_DIR/$codename instead of $ZIP_DIR/
ENV ZIP_SUBDIR false
# Apply the signature spoofing patch
# Valid values are "no", "yes" (for the original MicroG's patch) and "restricted" (to grant the
# permission only to the privileged apps)
# Apply the MicroG's signature spoofing patch
# Valid values are "no", "yes" (for the original MicroG's patch) and
# "restricted" (to grant the permission only to the system privileged apps).
#
# The original ("yes") patch allows user apps to gain the ability to spoof
# themselves as other apps, which can be a major security threat. Using the
# restricted patch and embedding the apps that requires it as system privileged
# apps is a much secure option. See the README.md ("Custom mode") for an
# example.
ENV SIGNATURE_SPOOFING "no"
# Generate delta files
@ -96,7 +102,7 @@ VOLUME $KEYS_DIR
# Copy required files
#####################
COPY src/* /root/
COPY src/ /root/
# Create missing directories
############################

36
src/build.sh
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@ -59,15 +59,33 @@ if ! [ -z "$DEVICE_LIST" ]; then
repo sync 2>&1 >&$DEBUG_LOG
# If needed, apply the MicroG's signature spoofing patch
cd frameworks/base
if [ "$SIGNATURE_SPOOFING" = "yes" ]; then
echo ">> [$(date)] Applying the standard signature spoofing patch to frameworks/base" >> $DOCKER_LOG
patch -p1 -i /root/android_frameworks_base-N.patch
git clean -f
elif [ "$SIGNATURE_SPOOFING" = "restricted" ]; then
echo ">> [$(date)] Applying the restricted signature spoofing patch to frameworks/base" >> $DOCKER_LOG
sed 's/android:protectionLevel="dangerous"/android:protectionLevel="signature|privileged"/' /root/android_frameworks_base-N.patch | patch -p1
git clean -f
if [ "$SIGNATURE_SPOOFING" = "yes" ] || [ "$SIGNATURE_SPOOFING" = "restricted" ]; then
# Determine which patch should be applied to the current branch
patch_name=""
git_branch=$(repo --no-pager info 2> /dev/null | grep -i "Manifest branch: ")
git_branch=${git_branch#Manifest branch: }
case $(echo $git_branch | grep -o "cm-[0-9][0-9]*\.[0-9]") in
"cm-11.0") patch_name="android_frameworks_base-KK-LP.patch" ;;
"cm-12.0"|"cm-12.1") patch_name="android_frameworks_base-KK-LP.patch" ;;
"cm-13.0") patch_name="android_frameworks_base-M.patch" ;;
"cm-14.0"|"cm-14.1") patch_name="android_frameworks_base-N.patch" ;;
esac
if ! [ -z $patch_name ]; then
cd frameworks/base
if [ "$SIGNATURE_SPOOFING" = "yes" ]; then
echo ">> [$(date)] Applying the standard signature spoofing patch ($patch_name) to frameworks/base" >> $DOCKER_LOG
echo ">> [$(date)] WARNING: the standard signature spoofing patch introduces a security threat" >> $DOCKER_LOG
patch -p1 -i "/root/signature_spoofing_patches/$patch_name"
else
echo ">> [$(date)] Applying the restricted signature spoofing patch (based on $patch_name) to frameworks/base" >> $DOCKER_LOG
sed 's/android:protectionLevel="dangerous"/android:protectionLevel="signature|privileged"/' "/root/signature_spoofing_patches/$patch_name" | patch -p1
fi
git clean -f
else
echo ">> [$(date)] ERROR: can't find a suitable signature spoofing patch for the current LineageOS branch ($git_branch)" >> $DOCKER_LOG
exit 1
fi
fi
cd $SRC_DIR

66
src/signature_spoofing_patches/android_frameworks_base-KK-LP.patch Normal file
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@ -0,0 +1,66 @@
diff --git a/core/java/android/content/pm/PackageParser.java b/core/java/android/content/pm/PackageParser.java
index e6da288..66684d3 100644
--- a/core/java/android/content/pm/PackageParser.java
+++ b/core/java/android/content/pm/PackageParser.java
@@ -447,10 +447,23 @@ public class PackageParser {
}
}
if ((flags&PackageManager.GET_SIGNATURES) != 0) {
- int N = (p.mSignatures != null) ? p.mSignatures.length : 0;
- if (N > 0) {
- pi.signatures = new Signature[N];
- System.arraycopy(p.mSignatures, 0, pi.signatures, 0, N);
+ boolean handledFakeSignature = false;
+ try {
+ if (p.requestedPermissions.contains("android.permission.FAKE_PACKAGE_SIGNATURE") && p.mAppMetaData != null
+ && p.mAppMetaData.get("fake-signature") instanceof String) {
+ pi.signatures = new Signature[] {new Signature(p.mAppMetaData.getString("fake-signature"))};
+ handledFakeSignature = true;
+ }
+ } catch (Throwable t) {
+ // We should never die because of any failures, this is system code!
+ Log.w("PackageParser.FAKE_PACKAGE_SIGNATURE", t);
+ }
+ if (!handledFakeSignature) {
+ int N = (p.mSignatures != null) ? p.mSignatures.length : 0;
+ if (N > 0) {
+ pi.signatures = new Signature[N];
+ System.arraycopy(p.mSignatures, 0, pi.signatures, 0, N);
+ }
}
}
return pi;
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 558a475..4e7aa65 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1562,6 +1562,13 @@
android:label="@string/permlab_getPackageSize"
android:description="@string/permdesc_getPackageSize" />
+ <!-- Allows an application to change the package signature as seen by applications -->
+ <permission android:name="android.permission.FAKE_PACKAGE_SIGNATURE"
+ android:permissionGroup="android.permission-group.SYSTEM_TOOLS"
+ 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/strings.xml b/core/res/res/values/strings.xml
index 790e166..8e66470 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -1135,6 +1135,11 @@
<string name="permdesc_getPackageSize">Allows the app to retrieve its code, data, and cache sizes</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_fakePackageSignature">mimic 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 use mimic another app\'s package signature.</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_installPackages">directly install apps</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_installPackages">Allows the app to install new or updated

104
src/signature_spoofing_patches/android_frameworks_base-M.patch Normal file
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@ -0,0 +1,104 @@
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
@@ -2816,8 +2816,27 @@ public class PackageManagerService extends IPackageManager.Stub {
final Set<String> permissions = 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

0
src/android_frameworks_base-N.patch → src/signature_spoofing_patches/android_frameworks_base-N.patch
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