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Commit509d0c5

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committed
safe mode to disable executing any external programs except git
1 parentbf51609 commit509d0c5

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2 files changed

+50
-6
lines changed

2 files changed

+50
-6
lines changed

‎git/cmd.py‎

Lines changed: 26 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -398,6 +398,7 @@ class Git(metaclass=_GitMeta):
398398

399399
__slots__= (
400400
"_working_dir",
401+
"_safe",
401402
"cat_file_all",
402403
"cat_file_header",
403404
"_version_info",
@@ -944,17 +945,20 @@ def __del__(self) -> None:
944945
self._stream.read(bytes_left+1)
945946
# END handle incomplete read
946947

947-
def__init__(self,working_dir:Union[None,PathLike]=None)->None:
948+
def__init__(self,working_dir:Union[None,PathLike]=None,safe:bool=False)->None:
948949
"""Initialize this instance with:
949950
950951
:param working_dir:
951952
Git directory we should work in. If ``None``, we always work in the current
952953
directory as returned by :func:`os.getcwd`.
953954
This is meant to be the working tree directory if available, or the
954955
``.git`` directory in case of bare repositories.
956+
957+
TODO :param safe:
955958
"""
956959
super().__init__()
957960
self._working_dir=expand_path(working_dir)
961+
self._safe=safe
958962
self._git_options:Union[List[str],Tuple[str, ...]]= ()
959963
self._persistent_git_options:List[str]= []
960964

@@ -1205,6 +1209,21 @@ def execute(
12051209
If you add additional keyword arguments to the signature of this method, you
12061210
must update the ``execute_kwargs`` variable housed in this module.
12071211
"""
1212+
ifself._safe:
1213+
ifisinstance(command,str):
1214+
command= [command]
1215+
config_args= [
1216+
'-c','core.askpass=/bin/true',
1217+
'-c','core.hooksPath=/dev/null',
1218+
'-c','core.sshCommand=/bin/true',
1219+
'-c','credential.helper=/bin/true',
1220+
'-c','http.emptyAuth=true',
1221+
'-c','protocol.allow=never',
1222+
'-c','protocol.https.allow=always',
1223+
'-c','url.https://.insteadOf=ssh://',
1224+
]
1225+
command= [command.pop(0)]+config_args+command
1226+
12081227
# Remove password for the command if present.
12091228
redacted_command=remove_password_if_present(command)
12101229
ifself.GIT_PYTHON_TRACEand (self.GIT_PYTHON_TRACE!="full"oras_process):
@@ -1227,6 +1246,12 @@ def execute(
12271246
# just to be sure.
12281247
env["LANGUAGE"]="C"
12291248
env["LC_ALL"]="C"
1249+
# Globally disable things that can execute commands, including password prompts.
1250+
ifself._safe:
1251+
env['GIT_TERMINAL_PROMPT']='false'
1252+
env['GIT_ASKPASS']='/bin/true'
1253+
env['SSH_ASKPASS']='/bin/true'
1254+
env['GIT_SSH']='/bin/true'
12301255
env.update(self._environment)
12311256
ifinline_envisnotNone:
12321257
env.update(inline_env)

‎git/repo/base.py‎

Lines changed: 24 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -131,6 +131,9 @@ class Repo:
131131
git_dir:PathLike
132132
"""The ``.git`` repository directory."""
133133

134+
safe:None
135+
"""Whether this is operating using restricted protocol and execution access."""
136+
134137
_common_dir:PathLike=""
135138

136139
# Precompiled regex
@@ -175,6 +178,7 @@ def __init__(
175178
odbt:Type[LooseObjectDB]=GitCmdObjectDB,
176179
search_parent_directories:bool=False,
177180
expand_vars:bool=True,
181+
safe:bool=False,
178182
)->None:
179183
R"""Create a new :class:`Repo` instance.
180184
@@ -204,6 +208,11 @@ def __init__(
204208
Please note that this was the default behaviour in older versions of
205209
GitPython, which is considered a bug though.
206210
211+
:param safe:
212+
Lock down the configuration to make it as safe as possible
213+
when working with publicly accessible, untrusted
214+
repositories.
215+
207216
:raise git.exc.InvalidGitRepositoryError:
208217
209218
:raise git.exc.NoSuchPathError:
@@ -235,6 +244,8 @@ def __init__(
235244
ifnotos.path.exists(epath):
236245
raiseNoSuchPathError(epath)
237246

247+
self.safe=safe
248+
238249
# Walk up the path to find the `.git` dir.
239250
curpath=epath
240251
git_dir=None
@@ -289,6 +300,8 @@ def __init__(
289300
raiseInvalidGitRepositoryError(epath)
290301
self.git_dir=git_dir
291302

303+
self.safe=safe
304+
292305
self._bare=False
293306
try:
294307
self._bare=self.config_reader("repository").getboolean("core","bare")
@@ -309,7 +322,7 @@ def __init__(
309322
# END working dir handling
310323

311324
self.working_dir:PathLike=self._working_tree_dirorself.common_dir
312-
self.git=self.GitCommandWrapperType(self.working_dir)
325+
self.git=self.GitCommandWrapperType(self.working_dir,safe)
313326

314327
# Special handling, in special times.
315328
rootpath=osp.join(self.common_dir,"objects")
@@ -1305,6 +1318,7 @@ def init(
13051318
mkdir:bool=True,
13061319
odbt:Type[GitCmdObjectDB]=GitCmdObjectDB,
13071320
expand_vars:bool=True,
1321+
safe:bool=False,
13081322
**kwargs:Any,
13091323
)->"Repo":
13101324
"""Initialize a git repository at the given path if specified.
@@ -1329,6 +1343,8 @@ def init(
13291343
information disclosure, allowing attackers to access the contents of
13301344
environment variables.
13311345
1346+
TODO :param safe:
1347+
13321348
:param kwargs:
13331349
Keyword arguments serving as additional options to the
13341350
:manpage:`git-init(1)` command.
@@ -1342,9 +1358,9 @@ def init(
13421358
os.makedirs(path,0o755)
13431359

13441360
# git command automatically chdir into the directory
1345-
git=cls.GitCommandWrapperType(path)
1361+
git=cls.GitCommandWrapperType(path,safe)
13461362
git.init(**kwargs)
1347-
returncls(path,odbt=odbt)
1363+
returncls(path,odbt=odbt,safe=safe)
13481364

13491365
@classmethod
13501366
def_clone(
@@ -1357,6 +1373,7 @@ def _clone(
13571373
multi_options:Optional[List[str]]=None,
13581374
allow_unsafe_protocols:bool=False,
13591375
allow_unsafe_options:bool=False,
1376+
safe:bool=False,
13601377
**kwargs:Any,
13611378
)->"Repo":
13621379
odbt=kwargs.pop("odbt",odb_default_type)
@@ -1418,7 +1435,7 @@ def _clone(
14181435
ifnotosp.isabs(path):
14191436
path=osp.join(git._working_dir,path)ifgit._working_dirisnotNoneelsepath
14201437

1421-
repo=cls(path,odbt=odbt)
1438+
repo=cls(path,odbt=odbt,safe=safe)
14221439

14231440
# Retain env values that were passed to _clone().
14241441
repo.git.update_environment(**git.environment())
@@ -1501,6 +1518,7 @@ def clone_from(
15011518
multi_options:Optional[List[str]]=None,
15021519
allow_unsafe_protocols:bool=False,
15031520
allow_unsafe_options:bool=False,
1521+
safe:bool=False,
15041522
**kwargs:Any,
15051523
)->"Repo":
15061524
"""Create a clone from the given URL.
@@ -1537,7 +1555,7 @@ def clone_from(
15371555
:return:
15381556
:class:`Repo` instance pointing to the cloned directory.
15391557
"""
1540-
git=cls.GitCommandWrapperType(os.getcwd())
1558+
git=cls.GitCommandWrapperType(os.getcwd(),safe)
15411559
ifenvisnotNone:
15421560
git.update_environment(**env)
15431561
returncls._clone(
@@ -1549,6 +1567,7 @@ def clone_from(
15491567
multi_options,
15501568
allow_unsafe_protocols=allow_unsafe_protocols,
15511569
allow_unsafe_options=allow_unsafe_options,
1570+
safe=safe,
15521571
**kwargs,
15531572
)
15541573

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