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-rw-r--r--CHANGELOG.rst11
-rw-r--r--docs/development/test-vectors.rst6
-rw-r--r--docs/hazmat/primitives/asymmetric/rsa.rst2
-rw-r--r--docs/hazmat/primitives/mac/index.rst2
-rw-r--r--docs/installation.rst2
-rw-r--r--src/cryptography/exceptions.py4
-rw-r--r--src/cryptography/hazmat/backends/commoncrypto/backend.py3
-rw-r--r--src/cryptography/hazmat/backends/openssl/backend.py53
-rw-r--r--src/cryptography/hazmat/backends/openssl/ciphers.py30
-rw-r--r--src/cryptography/hazmat/backends/openssl/dsa.py2
-rw-r--r--src/cryptography/hazmat/backends/openssl/hashes.py2
-rw-r--r--src/cryptography/hazmat/backends/openssl/hmac.py2
-rw-r--r--src/cryptography/hazmat/bindings/commoncrypto/binding.py3
-rw-r--r--src/cryptography/hazmat/bindings/openssl/binding.py46
-rw-r--r--src/cryptography/utils.py14
-rw-r--r--tests/hazmat/backends/test_openssl.py21
-rw-r--r--tests/hazmat/primitives/test_x963_vectors.py (renamed from tests/hazmat/primitives/test_X963_vectors.py)0
-rw-r--r--tests/test_x509.py24
18 files changed, 120 insertions, 107 deletions
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 705c09cd..fdea8c35 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,6 +8,17 @@ Changelog
* Added :class:`~cryptography.hazmat.primitives.kdf.x963kdf.X963KDF`.
+1.0.2 - 2015-09-27
+~~~~~~~~~~~~~~~~~~
+* **SECURITY ISSUE**: The OpenSSL backend prior to 1.0.2 made extensive use
+ of assertions to check response codes where our tests could not trigger a
+ failure. However, when Python is run with ``-O`` these asserts are optimized
+ away. If a user ran Python with this flag and got an invalid response code
+ this could result in undefined behavior or worse. Accordingly, all response
+ checks from the OpenSSL backend have been converted from ``assert``
+ to a true function call. Credit **Emilia Käsper (Google Security Team)**
+ for the report.
+
1.0.1 - 2015-09-05
~~~~~~~~~~~~~~~~~~
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 0495cc77..25871d5c 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -396,14 +396,14 @@ header format (substituting the correct information):
.. _`IETF`: https://www.ietf.org/
.. _`NIST CAVP`: http://csrc.nist.gov/groups/STM/cavp/
.. _`Bruce Schneier's vectors`: https://www.schneier.com/code/vectors.txt
-.. _`Camellia page`: http://info.isl.ntt.co.jp/crypt/eng/camellia/
-.. _`CRYPTREC`: http://www.cryptrec.go.jp
+.. _`Camellia page`: https://info.isl.ntt.co.jp/crypt/eng/camellia/
+.. _`CRYPTREC`: https://www.cryptrec.go.jp
.. _`OpenSSL's test vectors`: https://github.com/openssl/openssl/blob/97cf1f6c2854a3a955fd7dd3a1f113deba00c9ef/crypto/evp/evptests.txt#L232
.. _`RIPEMD website`: http://homes.esat.kuleuven.be/~bosselae/ripemd160.html
.. _`Whirlpool website`: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html
.. _`draft RFC`: https://tools.ietf.org/html/draft-josefsson-scrypt-kdf-01
.. _`Specification repository`: https://github.com/fernet/spec
-.. _`errata`: http://www.rfc-editor.org/errata_search.php?rfc=6238
+.. _`errata`: https://www.rfc-editor.org/errata_search.php?rfc=6238
.. _`OpenSSL example key`: https://github.com/openssl/openssl/blob/d02b48c63a58ea4367a0e905979f140b7d090f86/test/testrsa.pem
.. _`GnuTLS key parsing tests`: https://gitlab.com/gnutls/gnutls/commit/f16ef39ef0303b02d7fa590a37820440c466ce8d
.. _`enc-rsa-pkcs8.pem`: https://gitlab.com/gnutls/gnutls/blob/f8d943b38bf74eaaa11d396112daf43cb8aa82ae/tests/pkcs8-decode/encpkcs8.pem
diff --git a/docs/hazmat/primitives/asymmetric/rsa.rst b/docs/hazmat/primitives/asymmetric/rsa.rst
index a67ea47f..f88750cf 100644
--- a/docs/hazmat/primitives/asymmetric/rsa.rst
+++ b/docs/hazmat/primitives/asymmetric/rsa.rst
@@ -652,4 +652,4 @@ Key interfaces
.. _`Chinese Remainder Theorem`: https://en.wikipedia.org/wiki/RSA_%28cryptosystem%29#Using_the_Chinese_remainder_algorithm
.. _`security proof`: http://eprint.iacr.org/2001/062.pdf
.. _`recommended padding algorithm`: http://www.daemonology.net/blog/2009-06-11-cryptographic-right-answers.html
-.. _`proven secure`: http://cseweb.ucsd.edu/~mihir/papers/oae.pdf
+.. _`proven secure`: https://cseweb.ucsd.edu/~mihir/papers/oae.pdf
diff --git a/docs/hazmat/primitives/mac/index.rst b/docs/hazmat/primitives/mac/index.rst
index bc54bae4..05db708c 100644
--- a/docs/hazmat/primitives/mac/index.rst
+++ b/docs/hazmat/primitives/mac/index.rst
@@ -9,7 +9,7 @@ recommend that HMAC should be used unless you have a good reason otherwise.
For more information on why HMAC is preferred, see `Use cases for CMAC vs.
HMAC?`_
-.. _`Use cases for CMAC vs. HMAC?`: http://crypto.stackexchange.com/questions/15721/use-cases-for-cmac-vs-hmac
+.. _`Use cases for CMAC vs. HMAC?`: https://crypto.stackexchange.com/questions/15721/use-cases-for-cmac-vs-hmac
.. toctree::
:maxdepth: 1
diff --git a/docs/installation.rst b/docs/installation.rst
index 2f978852..928ed4e9 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -202,7 +202,7 @@ information, consult `Greg Wilson's blog post`_ on the subject.
.. _`Homebrew`: http://brew.sh
-.. _`MacPorts`: http://www.macports.org
+.. _`MacPorts`: https://www.macports.org
.. _`32-bit`: https://jenkins.cryptography.io/job/openssl-win32-release/
.. _`64-bit`: https://jenkins.cryptography.io/job/openssl-win64-release/
.. _`bug in conda`: https://github.com/conda/conda-recipes/issues/110
diff --git a/src/cryptography/exceptions.py b/src/cryptography/exceptions.py
index a4292eb8..29be22be 100644
--- a/src/cryptography/exceptions.py
+++ b/src/cryptography/exceptions.py
@@ -49,7 +49,9 @@ class InvalidSignature(Exception):
class InternalError(Exception):
- pass
+ def __init__(self, msg, err_code):
+ super(InternalError, self).__init__(msg)
+ self.err_code = err_code
class InvalidKey(Exception):
diff --git a/src/cryptography/hazmat/backends/commoncrypto/backend.py b/src/cryptography/hazmat/backends/commoncrypto/backend.py
index 091fbb7c..315d67d8 100644
--- a/src/cryptography/hazmat/backends/commoncrypto/backend.py
+++ b/src/cryptography/hazmat/backends/commoncrypto/backend.py
@@ -227,7 +227,8 @@ class Backend(object):
else:
raise InternalError(
"The backend returned an unknown error, consider filing a bug."
- " Code: {0}.".format(response)
+ " Code: {0}.".format(response),
+ response
)
def _release_cipher_ctx(self, ctx):
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index a476b1e9..ac025e95 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -15,9 +15,7 @@ import idna
import six
from cryptography import utils, x509
-from cryptography.exceptions import (
- InternalError, UnsupportedAlgorithm, _Reasons
-)
+from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.backends.interfaces import (
CMACBackend, CipherBackend, DERSerializationBackend, DSABackend,
EllipticCurveBackend, HMACBackend, HashBackend, PBKDF2HMACBackend,
@@ -42,7 +40,7 @@ from cryptography.hazmat.backends.openssl.x509 import (
_Certificate, _CertificateSigningRequest, _DISTPOINT_TYPE_FULLNAME,
_DISTPOINT_TYPE_RELATIVENAME
)
-from cryptography.hazmat.bindings.openssl.binding import Binding
+from cryptography.hazmat.bindings.openssl import binding
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import dsa, ec, rsa
from cryptography.hazmat.primitives.asymmetric.padding import (
@@ -58,14 +56,6 @@ from cryptography.x509.oid import ExtensionOID
_MemoryBIO = collections.namedtuple("_MemoryBIO", ["bio", "char_ptr"])
-_OpenSSLError = collections.namedtuple("_OpenSSLError",
- ["code", "lib", "func", "reason"])
-
-
-class UnhandledOpenSSLError(Exception):
- def __init__(self, msg, errors):
- super(UnhandledOpenSSLError, self).__init__(msg)
- self.errors = errors
def _encode_asn1_int(backend, x):
@@ -245,7 +235,7 @@ def _encode_basic_constraints(backend, basic_constraints):
constraints, backend._lib.BASIC_CONSTRAINTS_free
)
constraints.ca = 255 if basic_constraints.ca else 0
- if basic_constraints.ca:
+ if basic_constraints.ca and basic_constraints.path_length is not None:
constraints.pathlen = _encode_asn1_int(
backend, basic_constraints.path_length
)
@@ -524,7 +514,7 @@ class Backend(object):
name = "openssl"
def __init__(self):
- self._binding = Binding()
+ self._binding = binding.Binding()
self._ffi = self._binding.ffi
self._lib = self._binding.lib
@@ -541,14 +531,7 @@ class Backend(object):
self.activate_osrandom_engine()
def openssl_assert(self, ok):
- if not ok:
- errors = self._consume_errors()
- raise UnhandledOpenSSLError(
- "Unknown OpenSSL error. Please file an issue at https://github"
- ".com/pyca/cryptography/issues with information on how to "
- "reproduce this.",
- errors
- )
+ return binding._openssl_assert(self._lib, ok)
def activate_builtin_random(self):
# Obtain a new structural reference.
@@ -753,32 +736,8 @@ class Backend(object):
return self._ffi.buffer(buf)[:]
- def _err_string(self, code):
- err_buf = self._ffi.new("char[]", 256)
- self._lib.ERR_error_string_n(code, err_buf, 256)
- return self._ffi.string(err_buf, 256)[:]
-
def _consume_errors(self):
- errors = []
- while True:
- code = self._lib.ERR_get_error()
- if code == 0:
- break
-
- lib = self._lib.ERR_GET_LIB(code)
- func = self._lib.ERR_GET_FUNC(code)
- reason = self._lib.ERR_GET_REASON(code)
-
- errors.append(_OpenSSLError(code, lib, func, reason))
- return errors
-
- def _unknown_error(self, error):
- return InternalError(
- "Unknown error code {0} from OpenSSL, "
- "you should probably file a bug. {1}.".format(
- error.code, self._err_string(error.code)
- )
- )
+ return binding._consume_errors(self._lib)
def _bn_to_int(self, bn):
assert bn != self._ffi.NULL
diff --git a/src/cryptography/hazmat/backends/openssl/ciphers.py b/src/cryptography/hazmat/backends/openssl/ciphers.py
index 4c1c7bc9..a80708aa 100644
--- a/src/cryptography/hazmat/backends/openssl/ciphers.py
+++ b/src/cryptography/hazmat/backends/openssl/ciphers.py
@@ -136,23 +136,21 @@ class _CipherContext(object):
if not errors and isinstance(self._mode, modes.GCM):
raise InvalidTag
- assert errors
-
- if errors[0][1:] == (
- self._backend._lib.ERR_LIB_EVP,
- self._backend._lib.EVP_F_EVP_ENCRYPTFINAL_EX,
- self._backend._lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
- ) or errors[0][1:] == (
- self._backend._lib.ERR_LIB_EVP,
- self._backend._lib.EVP_F_EVP_DECRYPTFINAL_EX,
- self._backend._lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
- ):
- raise ValueError(
- "The length of the provided data is not a multiple of "
- "the block length."
+ self._backend.openssl_assert(
+ errors[0][1:] == (
+ self._backend._lib.ERR_LIB_EVP,
+ self._backend._lib.EVP_F_EVP_ENCRYPTFINAL_EX,
+ self._backend._lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
+ ) or errors[0][1:] == (
+ self._backend._lib.ERR_LIB_EVP,
+ self._backend._lib.EVP_F_EVP_DECRYPTFINAL_EX,
+ self._backend._lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
)
- else:
- raise self._backend._unknown_error(errors[0])
+ )
+ raise ValueError(
+ "The length of the provided data is not a multiple of "
+ "the block length."
+ )
if (isinstance(self._mode, modes.GCM) and
self._operation == self._ENCRYPT):
diff --git a/src/cryptography/hazmat/backends/openssl/dsa.py b/src/cryptography/hazmat/backends/openssl/dsa.py
index a442bfb7..9b4c1aff 100644
--- a/src/cryptography/hazmat/backends/openssl/dsa.py
+++ b/src/cryptography/hazmat/backends/openssl/dsa.py
@@ -83,7 +83,7 @@ class _DSASignatureContext(object):
0, data_to_sign, len(data_to_sign), sig_buf,
buflen, self._private_key._dsa_cdata)
self._backend.openssl_assert(res == 1)
- assert buflen[0]
+ self._backend.openssl_assert(buflen[0])
return self._backend._ffi.buffer(sig_buf)[:buflen[0]]
diff --git a/src/cryptography/hazmat/backends/openssl/hashes.py b/src/cryptography/hazmat/backends/openssl/hashes.py
index a6b65f22..02ce5f0d 100644
--- a/src/cryptography/hazmat/backends/openssl/hashes.py
+++ b/src/cryptography/hazmat/backends/openssl/hashes.py
@@ -56,7 +56,7 @@ class _HashContext(object):
outlen = self._backend._ffi.new("unsigned int *")
res = self._backend._lib.EVP_DigestFinal_ex(self._ctx, buf, outlen)
self._backend.openssl_assert(res != 0)
- assert outlen[0] == self.algorithm.digest_size
+ self._backend.openssl_assert(outlen[0] == self.algorithm.digest_size)
res = self._backend._lib.EVP_MD_CTX_cleanup(self._ctx)
self._backend.openssl_assert(res == 1)
return self._backend._ffi.buffer(buf)[:outlen[0]]
diff --git a/src/cryptography/hazmat/backends/openssl/hmac.py b/src/cryptography/hazmat/backends/openssl/hmac.py
index 52c691a5..dcf2fbaf 100644
--- a/src/cryptography/hazmat/backends/openssl/hmac.py
+++ b/src/cryptography/hazmat/backends/openssl/hmac.py
@@ -71,7 +71,7 @@ class _HMACContext(object):
self._ctx, buf, outlen
)
self._backend.openssl_assert(res != 0)
- assert outlen[0] == self.algorithm.digest_size
+ self._backend.openssl_assert(outlen[0] == self.algorithm.digest_size)
self._backend._lib.HMAC_CTX_cleanup(self._ctx)
return self._backend._ffi.buffer(buf)[:outlen[0]]
diff --git a/src/cryptography/hazmat/bindings/commoncrypto/binding.py b/src/cryptography/hazmat/bindings/commoncrypto/binding.py
index 1695c041..dfe046b5 100644
--- a/src/cryptography/hazmat/bindings/commoncrypto/binding.py
+++ b/src/cryptography/hazmat/bindings/commoncrypto/binding.py
@@ -13,6 +13,3 @@ class Binding(object):
"""
lib = lib
ffi = ffi
-
- def __init__(self):
- pass
diff --git a/src/cryptography/hazmat/bindings/openssl/binding.py b/src/cryptography/hazmat/bindings/openssl/binding.py
index 50d7f6d5..47b1d6e2 100644
--- a/src/cryptography/hazmat/bindings/openssl/binding.py
+++ b/src/cryptography/hazmat/bindings/openssl/binding.py
@@ -4,14 +4,46 @@
from __future__ import absolute_import, division, print_function
+import collections
import os
import threading
import types
+from cryptography.exceptions import InternalError
from cryptography.hazmat.bindings._openssl import ffi, lib
from cryptography.hazmat.bindings.openssl._conditional import CONDITIONAL_NAMES
+_OpenSSLError = collections.namedtuple("_OpenSSLError",
+ ["code", "lib", "func", "reason"])
+
+
+def _consume_errors(lib):
+ errors = []
+ while True:
+ code = lib.ERR_get_error()
+ if code == 0:
+ break
+
+ err_lib = lib.ERR_GET_LIB(code)
+ err_func = lib.ERR_GET_FUNC(code)
+ err_reason = lib.ERR_GET_REASON(code)
+
+ errors.append(_OpenSSLError(code, err_lib, err_func, err_reason))
+ return errors
+
+
+def _openssl_assert(lib, ok):
+ if not ok:
+ errors = _consume_errors(lib)
+ raise InternalError(
+ "Unknown OpenSSL error. Please file an issue at https://github.com"
+ "/pyca/cryptography/issues with information on how to reproduce "
+ "this.",
+ errors
+ )
+
+
@ffi.callback("int (*)(unsigned char *, int)", error=-1)
def _osrandom_rand_bytes(buf, size):
signed = ffi.cast("char *", buf)
@@ -64,7 +96,7 @@ class Binding(object):
@classmethod
def _register_osrandom_engine(cls):
- assert cls.lib.ERR_peek_error() == 0
+ _openssl_assert(cls.lib, cls.lib.ERR_peek_error() == 0)
looked_up_engine = cls.lib.ENGINE_by_id(cls._osrandom_engine_id)
if looked_up_engine != ffi.NULL:
raise RuntimeError("osrandom engine already registered")
@@ -72,19 +104,19 @@ class Binding(object):
cls.lib.ERR_clear_error()
engine = cls.lib.ENGINE_new()
- assert engine != cls.ffi.NULL
+ _openssl_assert(cls.lib, engine != cls.ffi.NULL)
try:
result = cls.lib.ENGINE_set_id(engine, cls._osrandom_engine_id)
- assert result == 1
+ _openssl_assert(cls.lib, result == 1)
result = cls.lib.ENGINE_set_name(engine, cls._osrandom_engine_name)
- assert result == 1
+ _openssl_assert(cls.lib, result == 1)
result = cls.lib.ENGINE_set_RAND(engine, cls._osrandom_method)
- assert result == 1
+ _openssl_assert(cls.lib, result == 1)
result = cls.lib.ENGINE_add(engine)
- assert result == 1
+ _openssl_assert(cls.lib, result == 1)
finally:
result = cls.lib.ENGINE_free(engine)
- assert result == 1
+ _openssl_assert(cls.lib, result == 1)
@classmethod
def _ensure_ffi_initialized(cls):
diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 237d5968..dac4046d 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -58,6 +58,12 @@ class InterfaceNotImplemented(Exception):
pass
+if hasattr(inspect, "signature"):
+ signature = inspect.signature
+else:
+ signature = inspect.getargspec
+
+
def verify_interface(iface, klass):
for method in iface.__abstractmethods__:
if not hasattr(klass, method):
@@ -67,13 +73,13 @@ def verify_interface(iface, klass):
if isinstance(getattr(iface, method), abc.abstractproperty):
# Can't properly verify these yet.
continue
- spec = inspect.getargspec(getattr(iface, method))
- actual = inspect.getargspec(getattr(klass, method))
- if spec != actual:
+ sig = signature(getattr(iface, method))
+ actual = signature(getattr(klass, method))
+ if sig != actual:
raise InterfaceNotImplemented(
"{0}.{1}'s signature differs from the expected. Expected: "
"{2!r}. Received: {3!r}".format(
- klass, method, spec, actual
+ klass, method, sig, actual
)
)
diff --git a/tests/hazmat/backends/test_openssl.py b/tests/hazmat/backends/test_openssl.py
index 5264ba55..8fd0d711 100644
--- a/tests/hazmat/backends/test_openssl.py
+++ b/tests/hazmat/backends/test_openssl.py
@@ -17,7 +17,7 @@ from cryptography import utils
from cryptography.exceptions import InternalError, _Reasons
from cryptography.hazmat.backends.interfaces import RSABackend
from cryptography.hazmat.backends.openssl.backend import (
- Backend, UnhandledOpenSSLError, backend
+ Backend, backend
)
from cryptography.hazmat.backends.openssl.ec import _sn_to_elliptic_curve
from cryptography.hazmat.primitives import hashes, serialization
@@ -124,7 +124,7 @@ class TestOpenSSL(object):
def test_openssl_assert(self):
backend.openssl_assert(True)
- with pytest.raises(UnhandledOpenSSLError):
+ with pytest.raises(InternalError):
backend.openssl_assert(False)
def test_consume_errors(self):
@@ -139,23 +139,6 @@ class TestOpenSSL(object):
assert backend._lib.ERR_peek_error() == 0
assert len(errors) == 10
- def test_openssl_error_string(self):
- backend._lib.ERR_put_error(
- backend._lib.ERR_LIB_EVP,
- backend._lib.EVP_F_EVP_DECRYPTFINAL_EX,
- 0,
- b"test_openssl.py",
- -1
- )
-
- errors = backend._consume_errors()
- exc = backend._unknown_error(errors[0])
-
- assert (
- "digital envelope routines:"
- "EVP_DecryptFinal_ex:digital envelope routines" in str(exc)
- )
-
def test_ssl_ciphers_registered(self):
meth = backend._lib.TLSv1_method()
ctx = backend._lib.SSL_CTX_new(meth)
diff --git a/tests/hazmat/primitives/test_X963_vectors.py b/tests/hazmat/primitives/test_x963_vectors.py
index 0332e601..0332e601 100644
--- a/tests/hazmat/primitives/test_X963_vectors.py
+++ b/tests/hazmat/primitives/test_x963_vectors.py
diff --git a/tests/test_x509.py b/tests/test_x509.py
index 220e71a5..0c022df1 100644
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -1601,6 +1601,30 @@ class TestCertificateBuilder(object):
decipher_only=False
)
+ @pytest.mark.requires_backend_interface(interface=RSABackend)
+ @pytest.mark.requires_backend_interface(interface=X509Backend)
+ def test_build_ca_request_with_path_length_none(self, backend):
+ private_key = RSA_KEY_2048.private_key(backend)
+
+ request = x509.CertificateSigningRequestBuilder().subject_name(
+ x509.Name([
+ x509.NameAttribute(NameOID.ORGANIZATION_NAME,
+ u'PyCA'),
+ ])
+ ).add_extension(
+ x509.BasicConstraints(ca=True, path_length=None), critical=True
+ ).sign(private_key, hashes.SHA1(), backend)
+
+ loaded_request = x509.load_pem_x509_csr(
+ request.public_bytes(encoding=serialization.Encoding.PEM), backend
+ )
+ subject = loaded_request.subject
+ assert isinstance(subject, x509.Name)
+ basic_constraints = request.extensions.get_extension_for_oid(
+ ExtensionOID.BASIC_CONSTRAINTS
+ )
+ assert basic_constraints.value.path_length is None
+
@pytest.mark.requires_backend_interface(interface=X509Backend)
class TestCertificateSigningRequestBuilder(object):
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-07 03:17:03 +0000