mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-14 18:34:30 -05:00
103 lines
4.9 KiB
Diff
103 lines
4.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Hao Ke <haok@google.com>
|
|
Date: Tue, 4 Oct 2022 19:43:58 +0000
|
|
Subject: [PATCH] Add safety checks on KEY_INTENT mismatch.
|
|
|
|
For many years, Parcel mismatch typed exploits has been using the
|
|
AccoungManagerService's passing of KEY_INTENT workflow, as a foothold of
|
|
launching arbitrary intents. We are adding an extra check on the service
|
|
side to simulate the final deserialization of the KEY_INTENT value, to
|
|
make sure the client side won't get a mismatched KEY_INTENT value.
|
|
|
|
Bug: 250588548
|
|
Bug: 240138294
|
|
Test: atest CtsAccountManagerTestCases
|
|
Test: local test, also see b/250588548
|
|
Change-Id: I433e34f6e21ce15c89825044a15b1dec46bb25cc
|
|
(cherry picked from commit eb9a0566a583fa13f8aff671c41f78a9e33eab82)
|
|
Merged-In: I433e34f6e21ce15c89825044a15b1dec46bb25cc
|
|
---
|
|
.../accounts/AccountManagerService.java | 34 ++++++++++++++++---
|
|
1 file changed, 30 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/services/core/java/com/android/server/accounts/AccountManagerService.java b/services/core/java/com/android/server/accounts/AccountManagerService.java
|
|
index 239297cc420a..7273e3ea5ffc 100644
|
|
--- a/services/core/java/com/android/server/accounts/AccountManagerService.java
|
|
+++ b/services/core/java/com/android/server/accounts/AccountManagerService.java
|
|
@@ -89,6 +89,7 @@ import android.os.UserHandle;
|
|
import android.os.UserManager;
|
|
import android.os.storage.StorageManager;
|
|
import android.text.TextUtils;
|
|
+import android.util.EventLog;
|
|
import android.util.Log;
|
|
import android.util.Pair;
|
|
import android.util.Slog;
|
|
@@ -2545,7 +2546,7 @@ public class AccountManagerService
|
|
*/
|
|
if (!checkKeyIntent(
|
|
Binder.getCallingUid(),
|
|
- intent)) {
|
|
+ result)) {
|
|
onError(AccountManager.ERROR_CODE_INVALID_RESPONSE,
|
|
"invalid intent in bundle returned");
|
|
return;
|
|
@@ -2960,7 +2961,7 @@ public class AccountManagerService
|
|
&& (intent = result.getParcelable(AccountManager.KEY_INTENT)) != null) {
|
|
if (!checkKeyIntent(
|
|
Binder.getCallingUid(),
|
|
- intent)) {
|
|
+ result)) {
|
|
onError(AccountManager.ERROR_CODE_INVALID_RESPONSE,
|
|
"invalid intent in bundle returned");
|
|
return;
|
|
@@ -4230,7 +4231,13 @@ public class AccountManagerService
|
|
* into launching aribtrary intents on the device via by tricking to click authenticator
|
|
* supplied entries in the system Settings app.
|
|
*/
|
|
- protected boolean checkKeyIntent(int authUid, Intent intent) {
|
|
+ protected boolean checkKeyIntent(int authUid, Bundle bundle) {
|
|
+ if (!checkKeyIntentParceledCorrectly(bundle)) {
|
|
+ EventLog.writeEvent(0x534e4554, "250588548", authUid, "");
|
|
+ return false;
|
|
+ }
|
|
+
|
|
+ Intent intent = bundle.getParcelable(AccountManager.KEY_INTENT);
|
|
// Explicitly set an empty ClipData to ensure that we don't offer to
|
|
// promote any Uris contained inside for granting purposes
|
|
if (intent.getClipData() == null) {
|
|
@@ -4263,6 +4270,25 @@ public class AccountManagerService
|
|
}
|
|
}
|
|
|
|
+ /**
|
|
+ * Simulate the client side's deserialization of KEY_INTENT value, to make sure they don't
|
|
+ * violate our security policy.
|
|
+ *
|
|
+ * In particular we want to make sure the Authenticator doesn't trick users
|
|
+ * into launching arbitrary intents on the device via exploiting any other Parcel read/write
|
|
+ * mismatch problems.
|
|
+ */
|
|
+ private boolean checkKeyIntentParceledCorrectly(Bundle bundle) {
|
|
+ Parcel p = Parcel.obtain();
|
|
+ p.writeBundle(bundle);
|
|
+ p.setDataPosition(0);
|
|
+ Bundle simulateBundle = p.readBundle();
|
|
+ p.recycle();
|
|
+ Intent intent = bundle.getParcelable(AccountManager.KEY_INTENT);
|
|
+ Intent simulateIntent = simulateBundle.getParcelable(AccountManager.KEY_INTENT);
|
|
+ return (intent.filterEquals(simulateIntent));
|
|
+ }
|
|
+
|
|
private void close() {
|
|
synchronized (mSessions) {
|
|
if (mSessions.remove(toString()) == null) {
|
|
@@ -4408,7 +4434,7 @@ public class AccountManagerService
|
|
&& (intent = result.getParcelable(AccountManager.KEY_INTENT)) != null) {
|
|
if (!checkKeyIntent(
|
|
Binder.getCallingUid(),
|
|
- intent)) {
|
|
+ result)) {
|
|
onError(AccountManager.ERROR_CODE_INVALID_RESPONSE,
|
|
"invalid intent in bundle returned");
|
|
return;
|