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Commit 7c87253b authored by Pranav Madapurmath's avatar Pranav Madapurmath
Browse files

Resolve cross account user icon validation. 

Resolves a vulnerability found with the cross account user icon
validation in StatusHint and TelecomServiceImpl (when registering a
phone account). The reporter found that an uri formatted as `userId%`
isn't parsed properly with the existing reference to Uri.encodedUserInfo.

Bug: 376461551
Bug: 376259166
Flag: EXEMPT bugfix
Test: atest TelecomServiceImplTest
Change-Id: I7a5f64ae01eaf6a133ea04c51bd00dbe1653b74f
Merged-In: I7a5f64ae01eaf6a133ea04c51bd00dbe1653b74f
parent b976a8b4

src/com/android/server/telecom/TelecomServiceImpl.java

+8 −9
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ import android.provider.Settings; 
import android.telecom.Log;

import android.telecom.PhoneAccount;

import android.telecom.PhoneAccountHandle;

import android.telecom.StatusHints;

import android.telecom.TelecomAnalytics;

import android.telecom.TelecomManager;

import android.telecom.VideoProfile;
@@ -2554,11 +2555,10 @@ public class TelecomServiceImpl { 
        // incompatible types.

        if (icon != null && (icon.getType() == Icon.TYPE_URI

                || icon.getType() == Icon.TYPE_URI_ADAPTIVE_BITMAP)) {

            String encodedUser = icon.getUri().getEncodedUserInfo();

            // If there is no encoded user, the URI is calling into the calling user space

            if (encodedUser != null) {

                int userId = Integer.parseInt(encodedUser);

                if (userId != UserHandle.getUserId(Binder.getCallingUid())) {

            int callingUserId = UserHandle.getCallingUserId();

            int requestingUserId = StatusHints.getUserIdFromAuthority(

                    icon.getUri().getAuthority(), callingUserId);

            if(callingUserId != requestingUserId) {

                // If we are transcending the profile boundary, throw an error.

                throw new IllegalArgumentException("Attempting to register a phone account with"

                        + " an image icon belonging to another user.");
@@ -2566,4 +2566,3 @@ public class TelecomServiceImpl { 
        }

    }

}
 
}

tests/src/com/android/server/telecom/tests/TelecomServiceImplTest.java

+14 −0
Original line number Diff line number Diff line
@@ -606,6 +606,20 @@ public class TelecomServiceImplTest extends TelecomTestCase { 
        // This should fail; security exception will be thrown.

        registerPhoneAccountTestHelper(phoneAccount, false);



        icon = Icon.createWithContentUri(

                new Uri.Builder().scheme("content")

                        .encodedAuthority("10%40media")

                        .path("external/images/media/${mediaId.text}".trim())

                        .build());

        phoneAccount = makePhoneAccount(phHandle).setIcon(icon).build();

        // This should fail; security exception will be thrown

        registerPhoneAccountTestHelper(phoneAccount, false);



        icon = Icon.createWithContentUri( Uri.parse("content://10%40play.ground"));

        phoneAccount = makePhoneAccount(phHandle).setIcon(icon).build();

        // This should fail; security exception will be thrown

        registerPhoneAccountTestHelper(phoneAccount, false);



        icon = Icon.createWithContentUri("content://0@media/external/images/media/");

        phoneAccount = makePhoneAccount(phHandle).setIcon(icon).build();

        // This should succeed.