From 3236c1b3906fc58e4ef7d4eaf3d9980fbc51dc18 Mon Sep 17 00:00:00 2001
From: Nex <nex@nex.sx>
Date: Thu, 9 Sep 2021 12:00:48 +0200
Subject: [PATCH] Added new TCC module

---
 docs/ios/records.md               | 10 ++++
 mvt/ios/modules/mixed/__init__.py |  3 +-
 mvt/ios/modules/mixed/tcc.py      | 90 +++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+), 1 deletion(-)
 create mode 100644 mvt/ios/modules/mixed/tcc.py

diff --git a/docs/ios/records.md b/docs/ios/records.md
index 66a85fa..3588e45 100644
--- a/docs/ios/records.md
+++ b/docs/ios/records.md
@@ -252,6 +252,16 @@ This JSON file is created by mvt-ios' `SMSAttachments` module. The module extrac
 
 ---
 
+### `tcc.json`
+
+!!! info "Availability"
+    Backup: :material-check:  
+    Full filesystem dump: :material-check:
+
+This JSON file is created by mvt-ios' `TCC` module. The module extracts records from a SQLite database located at */private/var/mobile/Library/TCC/TCC.db*, which contains a list of which services such as microphone, camera, or location, apps have been granted or denied access to.
+
+---
+
 ### `version_history.json`
 
 !!! info "Availability"
diff --git a/mvt/ios/modules/mixed/__init__.py b/mvt/ios/modules/mixed/__init__.py
index a7d59c8..5eb0070 100644
--- a/mvt/ios/modules/mixed/__init__.py
+++ b/mvt/ios/modules/mixed/__init__.py
@@ -18,6 +18,7 @@ from .safari_browserstate import SafariBrowserState
 from .safari_history import SafariHistory
 from .sms import SMS
 from .sms_attachments import SMSAttachments
+from .tcc import TCC
 from .webkit_resource_load_statistics import WebkitResourceLoadStatistics
 from .webkit_session_resource_log import WebkitSessionResourceLog
 from .whatsapp import Whatsapp
@@ -25,5 +26,5 @@ from .whatsapp import Whatsapp
 MIXED_MODULES = [Calls, ChromeFavicon, ChromeHistory, Contacts, FirefoxFavicon,
                  FirefoxHistory, IDStatusCache, InteractionC, LocationdClients,
                  OSAnalyticsADDaily, Datausage, SafariBrowserState, SafariHistory,
-                 SMS, SMSAttachments, WebkitResourceLoadStatistics,
+                 TCC, SMS, SMSAttachments, WebkitResourceLoadStatistics,
                  WebkitSessionResourceLog, Whatsapp,]
diff --git a/mvt/ios/modules/mixed/tcc.py b/mvt/ios/modules/mixed/tcc.py
new file mode 100644
index 0000000..f024f5c
--- /dev/null
+++ b/mvt/ios/modules/mixed/tcc.py
@@ -0,0 +1,90 @@
+# Mobile Verification Toolkit (MVT)
+# Copyright (c) 2021 The MVT Project Authors.
+# Use of this software is governed by the MVT License 1.1 that can be found at
+#   https://license.mvt.re/1.1/
+
+import sqlite3
+from datetime import datetime
+
+from mvt.common.utils import convert_timestamp_to_iso
+
+from ..base import IOSExtraction
+
+TCC_BACKUP_IDS = [
+    "64d0019cb3d46bfc8cce545a8ba54b93e7ea9347",
+]
+TCC_ROOT_PATHS = [
+    "private/var/mobile/Library/TCC/TCC.db",
+]
+
+AUTH_VALUES = {
+    0: "denied",
+    1: "unknown",
+    2: "allowed",
+    3: "limited",
+}
+AUTH_REASONS = {
+    1: "error",
+    2: "user_consent",
+    3: "user_set",
+    4: "system_set",
+    5: "service_policy",
+    6: "mdm_policy",
+    7: "override_policy",
+    8: "missing_usage_string",
+    9: "prompt_timeout",
+    10: "preflight_unknown",
+    11: "entitled",
+    12: "app_type_policy",
+}
+
+class TCC(IOSExtraction):
+    """This module extracts records from the TCC.db SQLite database."""
+
+    def __init__(self, file_path=None, base_folder=None, output_folder=None,
+                 fast_mode=False, log=None, results=[]):
+        super().__init__(file_path=file_path, base_folder=base_folder,
+                         output_folder=output_folder, fast_mode=fast_mode,
+                         log=log, results=results)
+
+    def process_db(self, file_path):
+        conn = sqlite3.connect(file_path)
+        cur = conn.cursor()
+        cur.execute("""SELECT 
+            service, client, client_type, auth_value, auth_reason, last_modified
+        FROM access;""")
+
+        for row in cur:
+            service = row[0]
+            client = row[1]
+            client_type = row[2]
+            client_type_desc = "bundle_id" if client_type == 0 else "absolute_path"
+            auth_value = row[3]
+            auth_value_desc = AUTH_VALUES.get(auth_value, "")
+            auth_reason = row[4]
+            auth_reason_desc = AUTH_REASONS.get(auth_reason, "unknown")
+            last_modified = convert_timestamp_to_iso(datetime.utcfromtimestamp((row[5])))
+
+            if service in ["kTCCServiceMicrophone", "kTCCServiceCamera"]:
+                device = "microphone" if service == "kTCCServiceMicrophone" else "camera"
+                self.log.info("Found client \"%s\" with access %s to %s on %s by %s",
+                              client, auth_value_desc, device, last_modified, auth_reason_desc)
+
+            self.results.append({
+                "service": service,
+                "client": client,
+                "client_type": client_type_desc,
+                "auth_value": auth_value_desc,
+                "auth_reason_desc": auth_reason_desc,
+                "last_modified": last_modified,
+            })
+
+        cur.close()
+        conn.close()
+
+    def run(self):
+        self._find_ios_database(backup_ids=TCC_BACKUP_IDS, root_paths=TCC_ROOT_PATHS)
+        self.log.info("Found TCC database at path: %s", self.file_path)
+        self.process_db(self.file_path)
+
+        self.log.info("Extracted a total of %d TCC items", len(self.results))