Support for apktool d --only-main-classes (#660)

* Support for apktool d --only-main-classes
Fixes #659

* Minor fixes, working now.

Author: AltayAkkus

objection/commands/mobile_packages.py

@@ -100,7 +100,7 @@ def patch_android_apk(source: str, architecture: str, pause: bool, skip_cleanup:
                       enable_debug: bool = True, gadget_version: str = None, skip_resources: bool = False,
                       network_security_config: bool = False, target_class: str = None,
                       use_aapt2: bool = False, gadget_config: str = None, script_source: str = None,
-                      ignore_nativelibs: bool = True, manifest: str = None, skip_signing: bool = False) -> None:
+                      ignore_nativelibs: bool = True, manifest: str = None, skip_signing: bool = False, only_main_classes: bool = False) -> None:
     """
         Patches an Android APK by extracting, patching SMALI, repackaging
         and signing a new APK.
@@ -176,7 +176,7 @@ def patch_android_apk(source: str, architecture: str, pause: bool, skip_cleanup:
 
     click.secho('Patcher will be using Gadget version: {0}'.format(github_version), fg='green')
 
-    patcher = AndroidPatcher(skip_cleanup=skip_cleanup, skip_resources=skip_resources, manifest=manifest)
+    patcher = AndroidPatcher(skip_cleanup=skip_cleanup, skip_resources=skip_resources, manifest=manifest, only_main_classes=only_main_classes)
 
     # ensure that we have all of the commandline requirements
     if not patcher.are_requirements_met():

objection/console/cli.py

@@ -278,9 +278,10 @@ def patchipa(source: str, gadget_version: str, codesign_signature: str, provisio
 @click.option('--ignore-nativelibs', '-n', is_flag=True, default=False,
               help='Do not change the extractNativeLibs flag in the AndroidManifest.xml.', show_default=False)
 @click.option('--manifest', '-m', help='A decoded AndroidManifest.xml file to read.', default=None)
+@click.option('--only-main-classes', help="Only patch classes that are in the main dex file.", is_flag=True, default=False)
 def patchapk(source: str, architecture: str, gadget_version: str, pause: bool, skip_cleanup: bool,
              enable_debug: bool, skip_resources: bool, network_security_config: bool, target_class: str,
-             use_aapt2: bool, gadget_config: str, script_source: str, ignore_nativelibs: bool, manifest: str, skip_signing: bool) -> None:
+             use_aapt2: bool, gadget_config: str, script_source: str, ignore_nativelibs: bool, manifest: str, skip_signing: bool, only_main_classes:bool = False) -> None:
     """
         Patch an APK with the frida-gadget.so.
     """

objection/utils/patchers/android.py

@@ -199,7 +199,7 @@ class AndroidPatcher(BasePlatformPatcher):
         }
     }
 
-    def __init__(self, skip_cleanup: bool = False, skip_resources: bool = False, manifest: str = None):
+    def __init__(self, skip_cleanup: bool = False, skip_resources: bool = False, manifest: str = None, only_main_classes: bool = False):
         super(AndroidPatcher, self).__init__()
 
         self.apk_source = None
@@ -214,6 +214,7 @@ def __init__(self, skip_cleanup: bool = False, skip_resources: bool = False, man
         self.keystore = os.path.join(os.path.abspath(os.path.dirname(__file__)), '../assets', 'objection.jks')
         self.netsec_config = os.path.join(os.path.abspath(os.path.dirname(__file__)), '../assets',
                                           'network_security_config.xml')
+        self.only_main_classes = only_main_classes
 
     def is_apktool_ready(self) -> bool:
         """
@@ -404,6 +405,7 @@ def unpack_apk(self):
             'decode',
             '-f',
             '-r' if self.skip_resources else '',
+            '--only-main-classes' if self.only_main_classes else '',
             '-o',
             self.apk_temp_directory,
             self.apk_source
@@ -412,7 +414,7 @@ def unpack_apk(self):
         if len(o.err) > 0:
             click.secho('An error may have occurred while extracting the APK.', fg='red')
             click.secho(o.err, fg='red')
-
+            
     def inject_internet_permission(self):
         """
             Checks the status of the source APK to see if it