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From a350f1e323977baffc6d709c0dc877c7f3faba73 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <encukou@gmail.com>
Date: Wed, 11 Aug 2021 16:51:03 +0200
Subject: [PATCH 01/10] Backport PyModule_AddObjectRef as
_PyModule_AddObjectRef
Having PyModule_AddObjectRef available should make backporting
newer patches easier. The new API is much safer.
The backport adds an underscore so that we don't break extension
modules that define PyModule_AddObjectRef themselves on Python<=3.9
(which would be a virtuous thing to do).
---
Include/modsupport.h | 10 ++++++++++
Python/modsupport.c | 13 +++++++++++--
2 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/Include/modsupport.h b/Include/modsupport.h
index 4c4aab6..d9fac52 100644
--- a/Include/modsupport.h
+++ b/Include/modsupport.h
@@ -136,7 +136,17 @@ PyAPI_FUNC(PyObject * const *) _PyArg_UnpackKeywords(
void _PyArg_Fini(void);
#endif /* Py_LIMITED_API */
+// Add an attribute with name 'name' and value 'obj' to the module 'mod.
+// On success, return 0 on success.
+// On error, raise an exception and return -1.
+// Backported from Python 3.10, where it's available without the underscore
+// in the name, to ease porting patches to RHEL
+PyAPI_FUNC(int) _PyModule_AddObjectRef(PyObject *mod, const char *name, PyObject *value);
+
+// Similar to PyModule_AddObjectRef() but steal a reference to 'obj'
+// (Py_DECREF(obj)) on success (if it returns 0).
PyAPI_FUNC(int) PyModule_AddObject(PyObject *, const char *, PyObject *);
+
PyAPI_FUNC(int) PyModule_AddIntConstant(PyObject *, const char *, long);
PyAPI_FUNC(int) PyModule_AddStringConstant(PyObject *, const char *, const char *);
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03090000
diff --git a/Python/modsupport.c b/Python/modsupport.c
index 13482c6..fca1083 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -631,7 +631,7 @@ va_build_stack(PyObject **small_stack, Py_ssize_t small_stack_len,
int
-PyModule_AddObject(PyObject *m, const char *name, PyObject *o)
+_PyModule_AddObjectRef(PyObject *m, const char *name, PyObject *o)
{
PyObject *dict;
if (!PyModule_Check(m)) {
@@ -655,10 +655,19 @@ PyModule_AddObject(PyObject *m, const char *name, PyObject *o)
}
if (PyDict_SetItemString(dict, name, o))
return -1;
- Py_DECREF(o);
return 0;
}
+int
+PyModule_AddObject(PyObject *mod, const char *name, PyObject *value)
+{
+ int res = _PyModule_AddObjectRef(mod, name, value);
+ if (res == 0) {
+ Py_DECREF(value);
+ }
+ return res;
+}
+
int
PyModule_AddIntConstant(PyObject *m, const char *name, long value)
{
--
2.37.3
From 500314edea579965f5641d8ebdce8c8899fe2838 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <encukou@gmail.com>
Date: Fri, 13 Aug 2021 13:16:43 +0200
Subject: [PATCH 02/10] _hashopenssl: Uncomment and use initialization function
list
This simplifies backporting of future changes.
We use this change instead of Python 3.10's:
bpo-1635741: Port _hashlib to multiphase initialization (GH-23358)
---
Modules/_hashopenssl.c | 30 +++++-------------------------
1 file changed, 5 insertions(+), 25 deletions(-)
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 4db058c..56dfff9 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -2227,7 +2227,6 @@ hashlib_init_hmactype(PyObject *module)
return 0;
}
-#if 0
static PyModuleDef_Slot hashlib_slots[] = {
/* OpenSSL 1.0.2 and LibreSSL */
{Py_mod_exec, hashlib_openssl_legacy_init},
@@ -2238,7 +2237,6 @@ static PyModuleDef_Slot hashlib_slots[] = {
{Py_mod_exec, hashlib_md_meth_names},
{0, NULL}
};
-#endif
static struct PyModuleDef _hashlibmodule = {
PyModuleDef_HEAD_INIT,
@@ -2266,29 +2264,11 @@ PyInit__hashlib(void)
return NULL;
}
- if (hashlib_openssl_legacy_init(m) < 0) {
- Py_DECREF(m);
- return NULL;
- }
- if (hashlib_init_hashtable(m) < 0) {
- Py_DECREF(m);
- return NULL;
- }
- if (hashlib_init_evptype(m) < 0) {
- Py_DECREF(m);
- return NULL;
- }
- if (hashlib_init_evpxoftype(m) < 0) {
- Py_DECREF(m);
- return NULL;
- }
- if (hashlib_init_hmactype(m) < 0) {
- Py_DECREF(m);
- return NULL;
- }
- if (hashlib_md_meth_names(m) == -1) {
- Py_DECREF(m);
- return NULL;
+ for (int i=0; hashlib_slots[i].slot; i++) {
+ if (((int (*)(PyObject*))hashlib_slots[i].value)(m) < 0) {
+ Py_DECREF(m);
+ return NULL;
+ }
}
return m;
--
2.37.3
From 76402d145bb24912f92d4013b8464e87b1493b45 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Sat, 27 Mar 2021 14:55:03 +0100
Subject: [PATCH 03/10] bpo-40645: use C implementation of HMAC (GH-24920,
GH-25063, GH-26079)
This backports the feature and 2 subsequent bugfixes
from: https://bugs.python.org/issue40645
Signed-off-by: Christian Heimes <christian@python.org>
Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>
Co-Authored-By: Pablo Galindo <Pablogsal@gmail.com>
---
Lib/hashlib.py | 1 +
Lib/hmac.py | 86 ++++++----
Lib/test/test_hmac.py | 114 +++++++------
.../2021-03-19-10-22-17.bpo-40645.5pXhb-.rst | 2 +
Modules/_hashopenssl.c | 150 ++++++++++++++++--
Modules/clinic/_hashopenssl.c.h | 38 +----
6 files changed, 265 insertions(+), 126 deletions(-)
create mode 100644 Misc/NEWS.d/next/Library/2021-03-19-10-22-17.bpo-40645.5pXhb-.rst
diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index 58c340d..ffa3be0 100644
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -173,6 +173,7 @@ try:
algorithms_available = algorithms_available.union(
_hashlib.openssl_md_meth_names)
except ImportError:
+ _hashlib = None
new = __py_new
__get_hash = __get_builtin_constructor
diff --git a/Lib/hmac.py b/Lib/hmac.py
index 180bc37..8b4f920 100644
--- a/Lib/hmac.py
+++ b/Lib/hmac.py
@@ -8,11 +8,12 @@ try:
import _hashlib as _hashopenssl
except ImportError:
_hashopenssl = None
- _openssl_md_meths = None
+ _functype = None
from _operator import _compare_digest as compare_digest
else:
- _openssl_md_meths = frozenset(_hashopenssl.openssl_md_meth_names)
compare_digest = _hashopenssl.compare_digest
+ _functype = type(_hashopenssl.openssl_sha256) # builtin type
+
import hashlib as _hashlib
trans_5C = bytes((x ^ 0x5C) for x in range(256))
@@ -23,7 +24,6 @@ trans_36 = bytes((x ^ 0x36) for x in range(256))
digest_size = None
-
class HMAC:
"""RFC 2104 HMAC class. Also complies with RFC 4231.
@@ -32,7 +32,7 @@ class HMAC:
blocksize = 64 # 512-bit HMAC; can be changed in subclasses.
__slots__ = (
- "_digest_cons", "_inner", "_outer", "block_size", "digest_size"
+ "_hmac", "_inner", "_outer", "block_size", "digest_size"
)
def __init__(self, key, msg=None, digestmod=''):
@@ -55,15 +55,30 @@ class HMAC:
if not digestmod:
raise TypeError("Missing required parameter 'digestmod'.")
+ if _hashopenssl and isinstance(digestmod, (str, _functype)):
+ try:
+ self._init_hmac(key, msg, digestmod)
+ except _hashopenssl.UnsupportedDigestmodError:
+ self._init_old(key, msg, digestmod)
+ else:
+ self._init_old(key, msg, digestmod)
+
+ def _init_hmac(self, key, msg, digestmod):
+ self._hmac = _hashopenssl.hmac_new(key, msg, digestmod=digestmod)
+ self.digest_size = self._hmac.digest_size
+ self.block_size = self._hmac.block_size
+
+ def _init_old(self, key, msg, digestmod):
if callable(digestmod):
- self._digest_cons = digestmod
+ digest_cons = digestmod
elif isinstance(digestmod, str):
- self._digest_cons = lambda d=b'': _hashlib.new(digestmod, d)
+ digest_cons = lambda d=b'': _hashlib.new(digestmod, d)
else:
- self._digest_cons = lambda d=b'': digestmod.new(d)
+ digest_cons = lambda d=b'': digestmod.new(d)
- self._outer = self._digest_cons()
- self._inner = self._digest_cons()
+ self._hmac = None
+ self._outer = digest_cons()
+ self._inner = digest_cons()
self.digest_size = self._inner.digest_size
if hasattr(self._inner, 'block_size'):
@@ -79,13 +94,13 @@ class HMAC:
RuntimeWarning, 2)
blocksize = self.blocksize
+ if len(key) > blocksize:
+ key = digest_cons(key).digest()
+
# self.blocksize is the default blocksize. self.block_size is
# effective block size as well as the public API attribute.
self.block_size = blocksize
- if len(key) > blocksize:
- key = self._digest_cons(key).digest()
-
key = key.ljust(blocksize, b'\0')
self._outer.update(key.translate(trans_5C))
self._inner.update(key.translate(trans_36))
@@ -94,23 +109,15 @@ class HMAC:
@property
def name(self):
- return "hmac-" + self._inner.name
-
- @property
- def digest_cons(self):
- return self._digest_cons
-
- @property
- def inner(self):
- return self._inner
-
- @property
- def outer(self):
- return self._outer
+ if self._hmac:
+ return self._hmac.name
+ else:
+ return f"hmac-{self._inner.name}"
def update(self, msg):
"""Feed data from msg into this hashing object."""
- self._inner.update(msg)
+ inst = self._hmac or self._inner
+ inst.update(msg)
def copy(self):
"""Return a separate copy of this hashing object.
@@ -119,10 +126,14 @@ class HMAC:
"""
# Call __new__ directly to avoid the expensive __init__.
other = self.__class__.__new__(self.__class__)
- other._digest_cons = self._digest_cons
other.digest_size = self.digest_size
- other._inner = self._inner.copy()
- other._outer = self._outer.copy()
+ if self._hmac:
+ other._hmac = self._hmac.copy()
+ other._inner = other._outer = None
+ else:
+ other._hmac = None
+ other._inner = self._inner.copy()
+ other._outer = self._outer.copy()
return other
def _current(self):
@@ -130,9 +141,12 @@ class HMAC:
To be used only internally with digest() and hexdigest().
"""
- h = self._outer.copy()
- h.update(self._inner.digest())
- return h
+ if self._hmac:
+ return self._hmac
+ else:
+ h = self._outer.copy()
+ h.update(self._inner.digest())
+ return h
def digest(self):
"""Return the hash value of this hashing object.
@@ -179,9 +193,11 @@ def digest(key, msg, digest):
A hashlib constructor returning a new hash object. *OR*
A module supporting PEP 247.
"""
- if (_hashopenssl is not None and
- isinstance(digest, str) and digest in _openssl_md_meths):
- return _hashopenssl.hmac_digest(key, msg, digest)
+ if _hashopenssl is not None and isinstance(digest, (str, _functype)):
+ try:
+ return _hashopenssl.hmac_digest(key, msg, digest)
+ except _hashopenssl.UnsupportedDigestmodError:
+ pass
if callable(digest):
digest_cons = digest
diff --git a/Lib/test/test_hmac.py b/Lib/test/test_hmac.py
index 6daf22c..adf52ad 100644
--- a/Lib/test/test_hmac.py
+++ b/Lib/test/test_hmac.py
@@ -11,14 +11,21 @@ from test.support import hashlib_helper
from _operator import _compare_digest as operator_compare_digest
try:
+ import _hashlib as _hashopenssl
from _hashlib import HMAC as C_HMAC
from _hashlib import hmac_new as c_hmac_new
from _hashlib import compare_digest as openssl_compare_digest
except ImportError:
+ _hashopenssl = None
C_HMAC = None
c_hmac_new = None
openssl_compare_digest = None
+try:
+ import _sha256 as sha256_module
+except ImportError:
+ sha256_module = None
+
def ignore_warning(func):
@functools.wraps(func)
@@ -32,22 +39,27 @@ def ignore_warning(func):
class TestVectorsTestCase(unittest.TestCase):
- def asssert_hmac(
- self, key, data, digest, hashfunc, hashname, digest_size, block_size
+ def assert_hmac_internals(
+ self, h, digest, hashname, digest_size, block_size
):
- h = hmac.HMAC(key, data, digestmod=hashfunc)
self.assertEqual(h.hexdigest().upper(), digest.upper())
self.assertEqual(h.digest(), binascii.unhexlify(digest))
self.assertEqual(h.name, f"hmac-{hashname}")
self.assertEqual(h.digest_size, digest_size)
self.assertEqual(h.block_size, block_size)
+ def assert_hmac(
+ self, key, data, digest, hashfunc, hashname, digest_size, block_size
+ ):
+ h = hmac.HMAC(key, data, digestmod=hashfunc)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
+
h = hmac.HMAC(key, data, digestmod=hashname)
- self.assertEqual(h.hexdigest().upper(), digest.upper())
- self.assertEqual(h.digest(), binascii.unhexlify(digest))
- self.assertEqual(h.name, f"hmac-{hashname}")
- self.assertEqual(h.digest_size, digest_size)
- self.assertEqual(h.block_size, block_size)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
h = hmac.HMAC(key, digestmod=hashname)
h2 = h.copy()
@@ -56,11 +68,9 @@ class TestVectorsTestCase(unittest.TestCase):
self.assertEqual(h.hexdigest().upper(), digest.upper())
h = hmac.new(key, data, digestmod=hashname)
- self.assertEqual(h.hexdigest().upper(), digest.upper())
- self.assertEqual(h.digest(), binascii.unhexlify(digest))
- self.assertEqual(h.name, f"hmac-{hashname}")
- self.assertEqual(h.digest_size, digest_size)
- self.assertEqual(h.block_size, block_size)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
h = hmac.new(key, None, digestmod=hashname)
h.update(data)
@@ -81,23 +91,18 @@ class TestVectorsTestCase(unittest.TestCase):
hmac.digest(key, data, digest=hashfunc),
binascii.unhexlify(digest)
)
- with unittest.mock.patch('hmac._openssl_md_meths', {}):
- self.assertEqual(
- hmac.digest(key, data, digest=hashname),
- binascii.unhexlify(digest)
- )
- self.assertEqual(
- hmac.digest(key, data, digest=hashfunc),
- binascii.unhexlify(digest)
- )
+
+ h = hmac.HMAC.__new__(hmac.HMAC)
+ h._init_old(key, data, digestmod=hashname)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
if c_hmac_new is not None:
h = c_hmac_new(key, data, digestmod=hashname)
- self.assertEqual(h.hexdigest().upper(), digest.upper())
- self.assertEqual(h.digest(), binascii.unhexlify(digest))
- self.assertEqual(h.name, f"hmac-{hashname}")
- self.assertEqual(h.digest_size, digest_size)
- self.assertEqual(h.block_size, block_size)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
h = c_hmac_new(key, digestmod=hashname)
h2 = h.copy()
@@ -105,12 +110,24 @@ class TestVectorsTestCase(unittest.TestCase):
h.update(data)
self.assertEqual(h.hexdigest().upper(), digest.upper())
+ func = getattr(_hashopenssl, f"openssl_{hashname}")
+ h = c_hmac_new(key, data, digestmod=func)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
+
+ h = hmac.HMAC.__new__(hmac.HMAC)
+ h._init_hmac(key, data, digestmod=hashname)
+ self.assert_hmac_internals(
+ h, digest, hashname, digest_size, block_size
+ )
+
@hashlib_helper.requires_hashdigest('md5', openssl=True)
def test_md5_vectors(self):
# Test the HMAC module against test vectors from the RFC.
def md5test(key, data, digest):
- self.asssert_hmac(
+ self.assert_hmac(
key, data, digest,
hashfunc=hashlib.md5,
hashname="md5",
@@ -150,7 +167,7 @@ class TestVectorsTestCase(unittest.TestCase):
@hashlib_helper.requires_hashdigest('sha1', openssl=True)
def test_sha_vectors(self):
def shatest(key, data, digest):
- self.asssert_hmac(
+ self.assert_hmac(
key, data, digest,
hashfunc=hashlib.sha1,
hashname="sha1",
@@ -191,7 +208,7 @@ class TestVectorsTestCase(unittest.TestCase):
def hmactest(key, data, hexdigests):
digest = hexdigests[hashfunc]
- self.asssert_hmac(
+ self.assert_hmac(
key, data, digest,
hashfunc=hashfunc,
hashname=hash_name,
@@ -427,6 +444,15 @@ class ConstructorTestCase(unittest.TestCase):
):
C_HMAC()
+ @unittest.skipUnless(sha256_module is not None, 'need _sha256')
+ def test_with_sha256_module(self):
+ h = hmac.HMAC(b"key", b"hash this!", digestmod=sha256_module.sha256)
+ self.assertEqual(h.hexdigest(), self.expected)
+ self.assertEqual(h.name, "hmac-sha256")
+
+ digest = hmac.digest(b"key", b"hash this!", sha256_module.sha256)
+ self.assertEqual(digest, binascii.unhexlify(self.expected))
+
class SanityTestCase(unittest.TestCase):
@@ -447,21 +473,21 @@ class SanityTestCase(unittest.TestCase):
class CopyTestCase(unittest.TestCase):
@hashlib_helper.requires_hashdigest('sha256')
- def test_attributes(self):
+ def test_attributes_old(self):
# Testing if attributes are of same type.
- h1 = hmac.HMAC(b"key", digestmod="sha256")
+ h1 = hmac.HMAC.__new__(hmac.HMAC)
+ h1._init_old(b"key", b"msg", digestmod="sha256")
h2 = h1.copy()
- self.assertTrue(h1._digest_cons == h2._digest_cons,
- "digest constructors don't match.")
self.assertEqual(type(h1._inner), type(h2._inner),
"Types of inner don't match.")
self.assertEqual(type(h1._outer), type(h2._outer),
"Types of outer don't match.")
@hashlib_helper.requires_hashdigest('sha256')
- def test_realcopy(self):
+ def test_realcopy_old(self):
# Testing if the copy method created a real copy.
- h1 = hmac.HMAC(b"key", digestmod="sha256")
+ h1 = hmac.HMAC.__new__(hmac.HMAC)
+ h1._init_old(b"key", b"msg", digestmod="sha256")
h2 = h1.copy()
# Using id() in case somebody has overridden __eq__/__ne__.
self.assertTrue(id(h1) != id(h2), "No real copy of the HMAC instance.")
@@ -469,17 +495,15 @@ class CopyTestCase(unittest.TestCase):
"No real copy of the attribute 'inner'.")
self.assertTrue(id(h1._outer) != id(h2._outer),
"No real copy of the attribute 'outer'.")
- self.assertEqual(h1._inner, h1.inner)
- self.assertEqual(h1._outer, h1.outer)
- self.assertEqual(h1._digest_cons, h1.digest_cons)
+ self.assertIs(h1._hmac, None)
+ @unittest.skipIf(_hashopenssl is None, "test requires _hashopenssl")
@hashlib_helper.requires_hashdigest('sha256')
- def test_properties(self):
- # deprecated properties
- h1 = hmac.HMAC(b"key", digestmod="sha256")
- self.assertEqual(h1._inner, h1.inner)
- self.assertEqual(h1._outer, h1.outer)
- self.assertEqual(h1._digest_cons, h1.digest_cons)
+ def test_realcopy_hmac(self):
+ h1 = hmac.HMAC.__new__(hmac.HMAC)
+ h1._init_hmac(b"key", b"msg", digestmod="sha256")
+ h2 = h1.copy()
+ self.assertTrue(id(h1._hmac) != id(h2._hmac))
@hashlib_helper.requires_hashdigest('sha256')
def test_equality(self):
diff --git a/Misc/NEWS.d/next/Library/2021-03-19-10-22-17.bpo-40645.5pXhb-.rst b/Misc/NEWS.d/next/Library/2021-03-19-10-22-17.bpo-40645.5pXhb-.rst
new file mode 100644
index 0000000..a9ab1c0
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-03-19-10-22-17.bpo-40645.5pXhb-.rst
@@ -0,0 +1,2 @@
+The :mod:`hmac` module now uses OpenSSL's HMAC implementation when digestmod
+argument is a hash name or builtin hash function.
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 56dfff9..ca9fea9 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -260,6 +260,8 @@ typedef struct {
PyTypeObject *EVPXOFtype;
#endif
_Py_hashtable_t *hashtable;
+ PyObject *constructs;
+ PyObject *unsupported_digestmod_error;
} _hashlibstate;
static inline _hashlibstate*
@@ -420,6 +422,48 @@ py_digest_by_name(PyObject *module, const char *name, enum Py_hash_type py_ht)
return digest;
}
+/* Get digest EVP from object
+ *
+ * * string
+ * * _hashopenssl builtin function
+ *
+ * on error returns NULL with exception set.
+ */
+static PY_EVP_MD*
+py_digest_by_digestmod(PyObject *module, PyObject *digestmod, enum Py_hash_type py_ht) {
+ PY_EVP_MD* evp;
+ PyObject *name_obj = NULL;
+ const char *name;
+
+ if (PyUnicode_Check(digestmod)) {
+ name_obj = digestmod;
+ } else {
+ _hashlibstate *state = get_hashlib_state(module);
+ // borrowed ref
+ name_obj = PyDict_GetItem(state->constructs, digestmod);
+ }
+ if (name_obj == NULL) {
+ _hashlibstate *state = get_hashlib_state(module);
+ PyErr_Clear();
+ PyErr_Format(
+ state->unsupported_digestmod_error,
+ "Unsupported digestmod %R", digestmod);
+ return NULL;
+ }
+
+ name = PyUnicode_AsUTF8(name_obj);
+ if (name == NULL) {
+ return NULL;
+ }
+
+ evp = py_digest_by_name(module, name, py_ht);
+ if (evp == NULL) {
+ return NULL;
+ }
+
+ return evp;
+}
+
static EVPobject *
newEVPobject(PyTypeObject *type)
{
@@ -1238,7 +1282,6 @@ pbkdf2_hmac_impl(PyObject *module, const char *hash_name,
PY_EVP_MD *digest = py_digest_by_name(module, hash_name, Py_ht_pbkdf2);
if (digest == NULL) {
- PyErr_SetString(PyExc_ValueError, "unsupported hash type");
goto end;
}
@@ -1443,25 +1486,21 @@ _hashlib.hmac_digest as _hashlib_hmac_singleshot
key: Py_buffer
msg: Py_buffer
- digest: str
+ digest: object
Single-shot HMAC.
[clinic start generated code]*/
static PyObject *
_hashlib_hmac_singleshot_impl(PyObject *module, Py_buffer *key,
- Py_buffer *msg, const char *digest)
-/*[clinic end generated code: output=15658ede5ab98185 input=019dffc571909a46]*/
+ Py_buffer *msg, PyObject *digest)
+/*[clinic end generated code: output=82f19965d12706ac input=0a0790cc3db45c2e]*/
{
unsigned char md[EVP_MAX_MD_SIZE] = {0};
unsigned int md_len = 0;
unsigned char *result;
PY_EVP_MD *evp;
- evp = py_digest_by_name(module, digest, Py_ht_mac);
- if (evp == NULL) {
- return NULL;
- }
if (key->len > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"key is too long.");
@@ -1473,7 +1512,7 @@ _hashlib_hmac_singleshot_impl(PyObject *module, Py_buffer *key,
return NULL;
}
- evp = py_digest_by_name(module, digest, Py_ht_mac);
+ evp = py_digest_by_digestmod(module, digest, Py_ht_mac);
if (evp == NULL) {
return NULL;
}
@@ -1505,15 +1544,15 @@ _hashlib.hmac_new
key: Py_buffer
msg as msg_obj: object(c_default="NULL") = b''
- digestmod: str(c_default="NULL") = None
+ digestmod: object(c_default="NULL") = None
Return a new hmac object.
[clinic start generated code]*/
static PyObject *
_hashlib_hmac_new_impl(PyObject *module, Py_buffer *key, PyObject *msg_obj,
- const char *digestmod)
-/*[clinic end generated code: output=9a35673be0cbea1b input=a0878868eb190134]*/
+ PyObject *digestmod)
+/*[clinic end generated code: output=c20d9e4d9ed6d219 input=5f4071dcc7f34362]*/
{
PyTypeObject *type = get_hashlib_state(module)->HMACtype;
PY_EVP_MD *digest;
@@ -1527,14 +1566,14 @@ _hashlib_hmac_new_impl(PyObject *module, Py_buffer *key, PyObject *msg_obj,
return NULL;
}
- if ((digestmod == NULL) || !strlen(digestmod)) {
+ if (digestmod == NULL) {
PyErr_SetString(
PyExc_TypeError, "Missing required parameter 'digestmod'.");
return NULL;
}
- digest = py_digest_by_name(module, digestmod, Py_ht_mac);
- if (!digest) {
+ digest = py_digest_by_digestmod(module, digestmod, Py_ht_mac);
+ if (digest == NULL) {
return NULL;
}
@@ -2117,6 +2156,8 @@ hashlib_traverse(PyObject *m, visitproc visit, void *arg)
#ifdef PY_OPENSSL_HAS_SHAKE
Py_VISIT(state->EVPXOFtype);
#endif
+ Py_VISIT(state->constructs);
+ Py_VISIT(state->unsupported_digestmod_error);
return 0;
}
@@ -2129,10 +2170,14 @@ hashlib_clear(PyObject *m)
#ifdef PY_OPENSSL_HAS_SHAKE
Py_CLEAR(state->EVPXOFtype);
#endif
+ Py_CLEAR(state->constructs);
+ Py_CLEAR(state->unsupported_digestmod_error);
+
if (state->hashtable != NULL) {
_Py_hashtable_destroy(state->hashtable);
state->hashtable = NULL;
}
+
return 0;
}
@@ -2227,6 +2272,79 @@ hashlib_init_hmactype(PyObject *module)
return 0;
}
+static int
+hashlib_init_constructors(PyObject *module)
+{
+ /* Create dict from builtin openssl_hash functions to name
+ * {_hashlib.openssl_sha256: "sha256", ...}
+ */
+ PyModuleDef *mdef;
+ PyMethodDef *fdef;
+ PyObject *proxy;
+ PyObject *func, *name_obj;
+ _hashlibstate *state = get_hashlib_state(module);
+
+ mdef = PyModule_GetDef(module);
+ if (mdef == NULL) {
+ return -1;
+ }
+
+ state->constructs = PyDict_New();
+ if (state->constructs == NULL) {
+ return -1;
+ }
+
+ for (fdef = mdef->m_methods; fdef->ml_name != NULL; fdef++) {
+ if (strncmp(fdef->ml_name, "openssl_", 8)) {
+ continue;
+ }
+ name_obj = PyUnicode_FromString(fdef->ml_name + 8);
+ if (name_obj == NULL) {
+ return -1;
+ }
+ func = PyObject_GetAttrString(module, fdef->ml_name);
+ if (func == NULL) {
+ Py_DECREF(name_obj);
+ return -1;
+ }
+ int rc = PyDict_SetItem(state->constructs, func, name_obj);
+ Py_DECREF(func);
+ Py_DECREF(name_obj);
+ if (rc < 0) {
+ return -1;
+ }
+ }
+
+ proxy = PyDictProxy_New(state->constructs);
+ if (proxy == NULL) {
+ return -1;
+ }
+
+ int rc = _PyModule_AddObjectRef(module, "_constructors", proxy);
+ Py_DECREF(proxy);
+ if (rc < 0) {
+ return -1;
+ }
+ return 0;
+}
+
+static int
+hashlib_exception(PyObject *module)
+{
+ _hashlibstate *state = get_hashlib_state(module);
+ state->unsupported_digestmod_error = PyErr_NewException(
+ "_hashlib.UnsupportedDigestmodError", PyExc_ValueError, NULL);
+ if (state->unsupported_digestmod_error == NULL) {
+ return -1;
+ }
+ if (_PyModule_AddObjectRef(module, "UnsupportedDigestmodError",
+ state->unsupported_digestmod_error) < 0) {
+ return -1;
+ }
+ return 0;
+}
+
+
static PyModuleDef_Slot hashlib_slots[] = {
/* OpenSSL 1.0.2 and LibreSSL */
{Py_mod_exec, hashlib_openssl_legacy_init},
@@ -2235,6 +2353,8 @@ static PyModuleDef_Slot hashlib_slots[] = {
{Py_mod_exec, hashlib_init_evpxoftype},
{Py_mod_exec, hashlib_init_hmactype},
{Py_mod_exec, hashlib_md_meth_names},
+ {Py_mod_exec, hashlib_init_constructors},
+ {Py_mod_exec, hashlib_exception},
{0, NULL}
};
diff --git a/Modules/clinic/_hashopenssl.c.h b/Modules/clinic/_hashopenssl.c.h
index 68aa765..4466ec4 100644
--- a/Modules/clinic/_hashopenssl.c.h
+++ b/Modules/clinic/_hashopenssl.c.h
@@ -1106,7 +1106,7 @@ PyDoc_STRVAR(_hashlib_hmac_singleshot__doc__,
static PyObject *
_hashlib_hmac_singleshot_impl(PyObject *module, Py_buffer *key,
- Py_buffer *msg, const char *digest);
+ Py_buffer *msg, PyObject *digest);
static PyObject *
_hashlib_hmac_singleshot(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
@@ -1117,7 +1117,7 @@ _hashlib_hmac_singleshot(PyObject *module, PyObject *const *args, Py_ssize_t nar
PyObject *argsbuf[3];
Py_buffer key = {NULL, NULL};
Py_buffer msg = {NULL, NULL};
- const char *digest;
+ PyObject *digest;
args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 3, 3, 0, argsbuf);
if (!args) {
@@ -1137,19 +1137,7 @@ _hashlib_hmac_singleshot(PyObject *module, PyObject *const *args, Py_ssize_t nar
_PyArg_BadArgument("hmac_digest", "argument 'msg'", "contiguous buffer", args[1]);
goto exit;
}
- if (!PyUnicode_Check(args[2])) {
- _PyArg_BadArgument("hmac_digest", "argument 'digest'", "str", args[2]);
- goto exit;
- }
- Py_ssize_t digest_length;
- digest = PyUnicode_AsUTF8AndSize(args[2], &digest_length);
- if (digest == NULL) {
- goto exit;
- }
- if (strlen(digest) != (size_t)digest_length) {
- PyErr_SetString(PyExc_ValueError, "embedded null character");
- goto exit;
- }
+ digest = args[2];
return_value = _hashlib_hmac_singleshot_impl(module, &key, &msg, digest);
exit:
@@ -1176,7 +1164,7 @@ PyDoc_STRVAR(_hashlib_hmac_new__doc__,
static PyObject *
_hashlib_hmac_new_impl(PyObject *module, Py_buffer *key, PyObject *msg_obj,
- const char *digestmod);
+ PyObject *digestmod);
static PyObject *
_hashlib_hmac_new(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
@@ -1188,7 +1176,7 @@ _hashlib_hmac_new(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyO
Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
Py_buffer key = {NULL, NULL};
PyObject *msg_obj = NULL;
- const char *digestmod = NULL;
+ PyObject *digestmod = NULL;
args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 1, 3, 0, argsbuf);
if (!args) {
@@ -1210,19 +1198,7 @@ _hashlib_hmac_new(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyO
goto skip_optional_pos;
}
}
- if (!PyUnicode_Check(args[2])) {
- _PyArg_BadArgument("hmac_new", "argument 'digestmod'", "str", args[2]);
- goto exit;
- }
- Py_ssize_t digestmod_length;
- digestmod = PyUnicode_AsUTF8AndSize(args[2], &digestmod_length);
- if (digestmod == NULL) {
- goto exit;
- }
- if (strlen(digestmod) != (size_t)digestmod_length) {
- PyErr_SetString(PyExc_ValueError, "embedded null character");
- goto exit;
- }
+ digestmod = args[2];
skip_optional_pos:
return_value = _hashlib_hmac_new_impl(module, &key, msg_obj, digestmod);
@@ -1442,4 +1418,4 @@ exit:
#ifndef _HASHLIB_GET_FIPS_MODE_METHODDEF
#define _HASHLIB_GET_FIPS_MODE_METHODDEF
#endif /* !defined(_HASHLIB_GET_FIPS_MODE_METHODDEF) */
-/*[clinic end generated code: output=b6b280e46bf0b139 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=7ff9aad0bd53e7ce input=a9049054013a1b77]*/
--
2.37.3
From 668a5b57d6454ff1a0e5c4db80002321e38cadfd Mon Sep 17 00:00:00 2001
From: Charalampos Stratakis <cstratak@redhat.com>
Date: Thu, 12 Dec 2019 16:58:31 +0100
Subject: [PATCH 04/10] Expose blake2b and blake2s hashes from OpenSSL
These aren't as powerful as Python's own implementation, but they can be
used under FIPS.
---
Lib/test/test_hashlib.py | 6 ++
Modules/_hashopenssl.c | 37 +++++++++++
Modules/clinic/_hashopenssl.c.h | 106 +++++++++++++++++++++++++++++++-
3 files changed, 148 insertions(+), 1 deletion(-)
diff --git a/Lib/test/test_hashlib.py b/Lib/test/test_hashlib.py
index f845c7a..7aaeb76 100644
--- a/Lib/test/test_hashlib.py
+++ b/Lib/test/test_hashlib.py
@@ -363,6 +363,12 @@ class HashLibTestCase(unittest.TestCase):
# 2 is for hashlib.name(...) and hashlib.new(name, ...)
self.assertGreaterEqual(len(constructors), 2)
for hash_object_constructor in constructors:
+
+ # OpenSSL's blake2s & blake2d don't support `key`
+ _name = hash_object_constructor.__name__
+ if 'key' in kwargs and _name.startswith('openssl_blake2'):
+ return
+
m = hash_object_constructor(data, **kwargs)
computed = m.hexdigest() if not shake else m.hexdigest(length)
self.assertEqual(
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index ca9fea9..9d98d20 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -1138,6 +1138,41 @@ _hashlib_openssl_sha512_impl(PyObject *module, PyObject *data_obj,
}
+/*[clinic input]
+_hashlib.openssl_blake2b
+ string as data_obj: object(py_default="b''") = NULL
+ *
+ usedforsecurity: bool = True
+Returns a blake2b hash object; optionally initialized with a string
+[clinic start generated code]*/
+
+static PyObject *
+_hashlib_openssl_blake2b_impl(PyObject *module, PyObject *data_obj,
+ int usedforsecurity)
+/*[clinic end generated code: output=7a838b1643cde13e input=4ad7fd54268f3689]*/
+
+{
+ return py_evp_fromname(module, Py_hash_blake2b, data_obj, usedforsecurity);
+}
+
+/*[clinic input]
+_hashlib.openssl_blake2s
+ string as data_obj: object(py_default="b''") = NULL
+ *
+ usedforsecurity: bool = True
+Returns a blake2s hash object; optionally initialized with a string
+[clinic start generated code]*/
+
+static PyObject *
+_hashlib_openssl_blake2s_impl(PyObject *module, PyObject *data_obj,
+ int usedforsecurity)
+/*[clinic end generated code: output=4eda6b40757471da input=1ed39481ffa4e26a]*/
+
+{
+ return py_evp_fromname(module, Py_hash_blake2s, data_obj, usedforsecurity);
+}
+
+
#ifdef PY_OPENSSL_HAS_SHA3
/*[clinic input]
@@ -2135,6 +2170,8 @@ static struct PyMethodDef EVP_functions[] = {
_HASHLIB_OPENSSL_SHA256_METHODDEF
_HASHLIB_OPENSSL_SHA384_METHODDEF
_HASHLIB_OPENSSL_SHA512_METHODDEF
+ _HASHLIB_OPENSSL_BLAKE2B_METHODDEF
+ _HASHLIB_OPENSSL_BLAKE2S_METHODDEF
_HASHLIB_OPENSSL_SHA3_224_METHODDEF
_HASHLIB_OPENSSL_SHA3_256_METHODDEF
_HASHLIB_OPENSSL_SHA3_384_METHODDEF
diff --git a/Modules/clinic/_hashopenssl.c.h b/Modules/clinic/_hashopenssl.c.h
index 4466ec4..54c22b2 100644
--- a/Modules/clinic/_hashopenssl.c.h
+++ b/Modules/clinic/_hashopenssl.c.h
@@ -540,6 +540,110 @@ exit:
return return_value;
}
+PyDoc_STRVAR(_hashlib_openssl_blake2b__doc__,
+"openssl_blake2b($module, /, string=b\'\', *, usedforsecurity=True)\n"
+"--\n"
+"\n"
+"Returns a blake2b hash object; optionally initialized with a string");
+
+#define _HASHLIB_OPENSSL_BLAKE2B_METHODDEF \
+ {"openssl_blake2b", (PyCFunction)(void(*)(void))_hashlib_openssl_blake2b, METH_FASTCALL|METH_KEYWORDS, _hashlib_openssl_blake2b__doc__},
+
+static PyObject *
+_hashlib_openssl_blake2b_impl(PyObject *module, PyObject *data_obj,
+ int usedforsecurity);
+
+static PyObject *
+_hashlib_openssl_blake2b(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+ PyObject *return_value = NULL;
+ static const char * const _keywords[] = {"string", "usedforsecurity", NULL};
+ static _PyArg_Parser _parser = {NULL, _keywords, "openssl_blake2b", 0};
+ PyObject *argsbuf[2];
+ Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 0;
+ PyObject *data_obj = NULL;
+ int usedforsecurity = 1;
+
+ args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 0, 1, 0, argsbuf);
+ if (!args) {
+ goto exit;
+ }
+ if (!noptargs) {
+ goto skip_optional_pos;
+ }
+ if (args[0]) {
+ data_obj = args[0];
+ if (!--noptargs) {
+ goto skip_optional_pos;
+ }
+ }
+skip_optional_pos:
+ if (!noptargs) {
+ goto skip_optional_kwonly;
+ }
+ usedforsecurity = PyObject_IsTrue(args[1]);
+ if (usedforsecurity < 0) {
+ goto exit;
+ }
+skip_optional_kwonly:
+ return_value = _hashlib_openssl_blake2b_impl(module, data_obj, usedforsecurity);
+
+exit:
+ return return_value;
+}
+
+PyDoc_STRVAR(_hashlib_openssl_blake2s__doc__,
+"openssl_blake2s($module, /, string=b\'\', *, usedforsecurity=True)\n"
+"--\n"
+"\n"
+"Returns a blake2s hash object; optionally initialized with a string");
+
+#define _HASHLIB_OPENSSL_BLAKE2S_METHODDEF \
+ {"openssl_blake2s", (PyCFunction)(void(*)(void))_hashlib_openssl_blake2s, METH_FASTCALL|METH_KEYWORDS, _hashlib_openssl_blake2s__doc__},
+
+static PyObject *
+_hashlib_openssl_blake2s_impl(PyObject *module, PyObject *data_obj,
+ int usedforsecurity);
+
+static PyObject *
+_hashlib_openssl_blake2s(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+ PyObject *return_value = NULL;
+ static const char * const _keywords[] = {"string", "usedforsecurity", NULL};
+ static _PyArg_Parser _parser = {NULL, _keywords, "openssl_blake2s", 0};
+ PyObject *argsbuf[2];
+ Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 0;
+ PyObject *data_obj = NULL;
+ int usedforsecurity = 1;
+
+ args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 0, 1, 0, argsbuf);
+ if (!args) {
+ goto exit;
+ }
+ if (!noptargs) {
+ goto skip_optional_pos;
+ }
+ if (args[0]) {
+ data_obj = args[0];
+ if (!--noptargs) {
+ goto skip_optional_pos;
+ }
+ }
+skip_optional_pos:
+ if (!noptargs) {
+ goto skip_optional_kwonly;
+ }
+ usedforsecurity = PyObject_IsTrue(args[1]);
+ if (usedforsecurity < 0) {
+ goto exit;
+ }
+skip_optional_kwonly:
+ return_value = _hashlib_openssl_blake2s_impl(module, data_obj, usedforsecurity);
+
+exit:
+ return return_value;
+}
+
#if defined(PY_OPENSSL_HAS_SHA3)
PyDoc_STRVAR(_hashlib_openssl_sha3_224__doc__,
@@ -1418,4 +1522,4 @@ exit:
#ifndef _HASHLIB_GET_FIPS_MODE_METHODDEF
#define _HASHLIB_GET_FIPS_MODE_METHODDEF
#endif /* !defined(_HASHLIB_GET_FIPS_MODE_METHODDEF) */
-/*[clinic end generated code: output=7ff9aad0bd53e7ce input=a9049054013a1b77]*/
+/*[clinic end generated code: output=fab05055e982f112 input=a9049054013a1b77]*/
--
2.37.3
From 1613c11b882e192456592a6adb63f73351f82829 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Thu, 1 Aug 2019 17:57:05 +0200
Subject: [PATCH 05/10] Use a stronger hash in multiprocessing handshake
Adapted from patch by David Malcolm,
https://bugs.python.org/issue17258
---
Lib/multiprocessing/connection.py | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index 510e4b5..b68f2fb 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -42,6 +42,10 @@ BUFSIZE = 8192
# A very generous timeout when it comes to local connections...
CONNECTION_TIMEOUT = 20.
+# The hmac module implicitly defaults to using MD5.
+# Support using a stronger algorithm for the challenge/response code:
+HMAC_DIGEST_NAME='sha256'
+
_mmap_counter = itertools.count()
default_family = 'AF_INET'
@@ -741,7 +745,7 @@ def deliver_challenge(connection, authkey):
"Authkey must be bytes, not {0!s}".format(type(authkey)))
message = os.urandom(MESSAGE_LENGTH)
connection.send_bytes(CHALLENGE + message)
- digest = hmac.new(authkey, message, 'md5').digest()
+ digest = hmac.new(authkey, message, HMAC_DIGEST_NAME).digest()
response = connection.recv_bytes(256) # reject large message
if response == digest:
connection.send_bytes(WELCOME)
@@ -757,7 +761,7 @@ def answer_challenge(connection, authkey):
message = connection.recv_bytes(256) # reject large message
assert message[:len(CHALLENGE)] == CHALLENGE, 'message = %r' % message
message = message[len(CHALLENGE):]
- digest = hmac.new(authkey, message, 'md5').digest()
+ digest = hmac.new(authkey, message, HMAC_DIGEST_NAME).digest()
connection.send_bytes(digest)
response = connection.recv_bytes(256) # reject large message
if response != WELCOME:
--
2.37.3
From c0413586c6fb26bd4b7c4d5c40094ceeffb74612 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Thu, 25 Jul 2019 17:19:06 +0200
Subject: [PATCH 06/10] Disable Python's hash implementations in FIPS mode,
forcing OpenSSL
---
Lib/hashlib.py | 11 +++++++----
Lib/test/test_hashlib.py | 17 ++++++++++++-----
Modules/_blake2/blake2b_impl.c | 4 ++++
Modules/_blake2/blake2module.c | 3 +++
Modules/_blake2/blake2s_impl.c | 4 ++++
Modules/hashlib.h | 23 +++++++++++++++++++++++
setup.py | 27 ++++++++++++++++-----------
7 files changed, 69 insertions(+), 20 deletions(-)
diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index ffa3be0..3e3f4dd 100644
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -70,14 +70,17 @@ __all__ = __always_supported + ('new', 'algorithms_guaranteed',
__builtin_constructor_cache = {}
-# Prefer our blake2 implementation
+# Prefer our blake2 implementation (unless in FIPS mode)
# OpenSSL 1.1.0 comes with a limited implementation of blake2b/s. The OpenSSL
# implementations neither support keyed blake2 (blake2 MAC) nor advanced
# features like salt, personalization, or tree hashing. OpenSSL hash-only
# variants are available as 'blake2b512' and 'blake2s256', though.
-__block_openssl_constructor = {
- 'blake2b', 'blake2s',
-}
+import _hashlib
+if _hashlib.get_fips_mode():
+ __block_openssl_constructor = set()
+else:
+ __block_openssl_constructor = {'blake2b', 'blake2s'}
+
def __get_builtin_constructor(name):
cache = __builtin_constructor_cache
diff --git a/Lib/test/test_hashlib.py b/Lib/test/test_hashlib.py
index 7aaeb76..fa4a8d7 100644
--- a/Lib/test/test_hashlib.py
+++ b/Lib/test/test_hashlib.py
@@ -35,14 +35,15 @@ else:
m.strip() for m in builtin_hashes.strip('"').lower().split(",")
}
-# hashlib with and without OpenSSL backend for PBKDF2
-# only import builtin_hashlib when all builtin hashes are available.
-# Otherwise import prints noise on stderr
+# RHEL: `_hashlib` is always importable and `hashlib` can't be imported
+# without it.
openssl_hashlib = import_fresh_module('hashlib', fresh=['_hashlib'])
-if builtin_hashes == default_builtin_hashes:
+try:
builtin_hashlib = import_fresh_module('hashlib', blocked=['_hashlib'])
-else:
+except ImportError:
builtin_hashlib = None
+else:
+ raise AssertionError('hashlib is importablee without _hashlib')
try:
from _hashlib import HASH, HASHXOF, openssl_md_meth_names, get_fips_mode
@@ -118,6 +119,12 @@ class HashLibTestCase(unittest.TestCase):
except ModuleNotFoundError as error:
if self._warn_on_extension_import and module_name in builtin_hashes:
warnings.warn('Did a C extension fail to compile? %s' % error)
+ except ImportError:
+ if get_fips_mode() and module_name == '_blake2':
+ # blake2b & blake2s disabled under FIPS
+ return None
+ else:
+ raise
return None
def __init__(self, *args, **kwargs):
diff --git a/Modules/_blake2/blake2b_impl.c b/Modules/_blake2/blake2b_impl.c
index 7fb1296..bc01cd5 100644
--- a/Modules/_blake2/blake2b_impl.c
+++ b/Modules/_blake2/blake2b_impl.c
@@ -96,6 +96,8 @@ py_blake2b_new_impl(PyTypeObject *type, PyObject *data, int digest_size,
BLAKE2bObject *self = NULL;
Py_buffer buf;
+ FAIL_RETURN_IN_FIPS_MODE(PyExc_ValueError, "_blake2");
+
self = new_BLAKE2bObject(type);
if (self == NULL) {
goto error;
@@ -274,6 +276,8 @@ _blake2_blake2b_update(BLAKE2bObject *self, PyObject *data)
{
Py_buffer buf;
+ FAIL_RETURN_IN_FIPS_MODE(PyExc_ValueError, "_blake2");
+
GET_BUFFER_VIEW_OR_ERROUT(data, &buf);
if (self->lock == NULL && buf.len >= HASHLIB_GIL_MINSIZE)
diff --git a/Modules/_blake2/blake2module.c b/Modules/_blake2/blake2module.c
index ff142c9..144ec03 100644
--- a/Modules/_blake2/blake2module.c
+++ b/Modules/_blake2/blake2module.c
@@ -9,6 +9,7 @@
*/
#include "Python.h"
+#include "../hashlib.h"
#include "impl/blake2.h"
@@ -57,6 +58,8 @@ PyInit__blake2(void)
PyObject *m;
PyObject *d;
+ FAIL_RETURN_IN_FIPS_MODE(PyExc_ImportError, "blake2");
+
m = PyModule_Create(&blake2_module);
if (m == NULL)
return NULL;
diff --git a/Modules/_blake2/blake2s_impl.c b/Modules/_blake2/blake2s_impl.c
index e3e90d0..e45f8f6 100644
--- a/Modules/_blake2/blake2s_impl.c
+++ b/Modules/_blake2/blake2s_impl.c
@@ -96,6 +96,8 @@ py_blake2s_new_impl(PyTypeObject *type, PyObject *data, int digest_size,
BLAKE2sObject *self = NULL;
Py_buffer buf;
+ FAIL_RETURN_IN_FIPS_MODE(PyExc_ValueError, "_blake2");
+
self = new_BLAKE2sObject(type);
if (self == NULL) {
goto error;
@@ -274,6 +276,8 @@ _blake2_blake2s_update(BLAKE2sObject *self, PyObject *data)
{
Py_buffer buf;
+ FAIL_RETURN_IN_FIPS_MODE(PyExc_ValueError, "_blake2");
+
GET_BUFFER_VIEW_OR_ERROUT(data, &buf);
if (self->lock == NULL && buf.len >= HASHLIB_GIL_MINSIZE)
diff --git a/Modules/hashlib.h b/Modules/hashlib.h
index 56ae7a5..45fb403 100644
--- a/Modules/hashlib.h
+++ b/Modules/hashlib.h
@@ -1,5 +1,11 @@
/* Common code for use by all hashlib related modules. */
+// RHEL: use OpenSSL to turn off unsupported modules under FIPS mode
+// EVP_default_properties_is_fips_enabled() on OpenSSL >= 3.0.0
+#include <openssl/evp.h>
+// FIPS_mode() on OpenSSL < 3.0.0
+#include <openssl/crypto.h>
+
/*
* Given a PyObject* obj, fill in the Py_buffer* viewp with the result
* of PyObject_GetBuffer. Sets an exception and issues the erraction
@@ -57,3 +63,20 @@
* to allow the user to optimize based on the platform they're using. */
#define HASHLIB_GIL_MINSIZE 2048
+__attribute__((__unused__))
+static int
+_Py_hashlib_fips_error(PyObject *exc, char *name) {
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+ if (EVP_default_properties_is_fips_enabled(NULL)) {
+#else
+ if (FIPS_mode()) {
+#endif
+ PyErr_Format(exc, "%s is not available in FIPS mode", name);
+ return 1;
+ }
+ return 0;
+}
+
+#define FAIL_RETURN_IN_FIPS_MODE(exc, name) do { \
+ if (_Py_hashlib_fips_error(exc, name)) return NULL; \
+} while (0)
diff --git a/setup.py b/setup.py
index 0bec170..479f4b5 100644
--- a/setup.py
+++ b/setup.py
@@ -2315,7 +2315,7 @@ class PyBuildExt(build_ext):
sources=sources,
depends=depends))
- def detect_openssl_hashlib(self):
+ def detect_openssl_args(self):
# Detect SSL support for the socket module (via _ssl)
config_vars = sysconfig.get_config_vars()
@@ -2335,16 +2335,14 @@ class PyBuildExt(build_ext):
openssl_libs = split_var('OPENSSL_LIBS', '-l')
if not openssl_libs:
# libssl and libcrypto not found
- self.missing.extend(['_ssl', '_hashlib'])
- return None, None
+ raise ValueError('Cannot build for RHEL without OpenSSL')
# Find OpenSSL includes
ssl_incs = find_file(
'openssl/ssl.h', self.inc_dirs, openssl_includes
)
if ssl_incs is None:
- self.missing.extend(['_ssl', '_hashlib'])
- return None, None
+ raise ValueError('Cannot build for RHEL without OpenSSL')
# OpenSSL 1.0.2 uses Kerberos for KRB5 ciphers
krb5_h = find_file(
@@ -2354,12 +2352,20 @@ class PyBuildExt(build_ext):
if krb5_h:
ssl_incs.extend(krb5_h)
+ return {
+ 'include_dirs': openssl_includes,
+ 'library_dirs': openssl_libdirs,
+ 'libraries': openssl_libs,
+ }
+
+ def detect_openssl_hashlib(self):
+
+ config_vars = sysconfig.get_config_vars()
+
if config_vars.get("HAVE_X509_VERIFY_PARAM_SET1_HOST"):
self.add(Extension(
'_ssl', ['_ssl.c'],
- include_dirs=openssl_includes,
- library_dirs=openssl_libdirs,
- libraries=openssl_libs,
+ **self.detect_openssl_args(),
depends=[
'socketmodule.h',
'_ssl/debughelpers.c',
@@ -2372,9 +2378,7 @@ class PyBuildExt(build_ext):
self.add(Extension('_hashlib', ['_hashopenssl.c'],
depends=['hashlib.h'],
- include_dirs=openssl_includes,
- library_dirs=openssl_libdirs,
- libraries=openssl_libs))
+ **self.detect_openssl_args()) )
def detect_hash_builtins(self):
# By default we always compile these even when OpenSSL is available
@@ -2431,6 +2435,7 @@ class PyBuildExt(build_ext):
'_blake2/blake2b_impl.c',
'_blake2/blake2s_impl.c'
],
+ **self.detect_openssl_args(), # for FIPS_mode verification
depends=blake2_deps
))
--
2.37.3
From 205bd746c16c7f8ac09251316c62bf78d6c31611 Mon Sep 17 00:00:00 2001
From: Charalampos Stratakis <cstratak@redhat.com>
Date: Fri, 29 Jan 2021 14:16:21 +0100
Subject: [PATCH 07/10] Use python's fall back crypto implementations only if
we are not in FIPS mode
---
Lib/hashlib.py | 69 +++-------------------------------------
Lib/test/test_hashlib.py | 23 +++++++++++++-
2 files changed, 27 insertions(+), 65 deletions(-)
diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index 3e3f4dd..b842f5f 100644
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -67,7 +67,6 @@ algorithms_available = set(__always_supported)
__all__ = __always_supported + ('new', 'algorithms_guaranteed',
'algorithms_available', 'pbkdf2_hmac')
-
__builtin_constructor_cache = {}
# Prefer our blake2 implementation (unless in FIPS mode)
@@ -83,6 +82,8 @@ else:
def __get_builtin_constructor(name):
+ if _hashlib.get_fips_mode():
+ raise ValueError('unsupported hash type ' + name + '(in FIPS mode)')
cache = __builtin_constructor_cache
constructor = cache.get(name)
if constructor is not None:
@@ -176,79 +177,19 @@ try:
algorithms_available = algorithms_available.union(
_hashlib.openssl_md_meth_names)
except ImportError:
- _hashlib = None
- new = __py_new
- __get_hash = __get_builtin_constructor
+ raise # importing _hashlib should never fail on RHEL
try:
# OpenSSL's PKCS5_PBKDF2_HMAC requires OpenSSL 1.0+ with HMAC and SHA
from _hashlib import pbkdf2_hmac
except ImportError:
- _trans_5C = bytes((x ^ 0x5C) for x in range(256))
- _trans_36 = bytes((x ^ 0x36) for x in range(256))
-
- def pbkdf2_hmac(hash_name, password, salt, iterations, dklen=None):
- """Password based key derivation function 2 (PKCS #5 v2.0)
-
- This Python implementations based on the hmac module about as fast
- as OpenSSL's PKCS5_PBKDF2_HMAC for short passwords and much faster
- for long passwords.
- """
- if not isinstance(hash_name, str):
- raise TypeError(hash_name)
-
- if not isinstance(password, (bytes, bytearray)):
- password = bytes(memoryview(password))
- if not isinstance(salt, (bytes, bytearray)):
- salt = bytes(memoryview(salt))
-
- # Fast inline HMAC implementation
- inner = new(hash_name)
- outer = new(hash_name)
- blocksize = getattr(inner, 'block_size', 64)
- if len(password) > blocksize:
- password = new(hash_name, password).digest()
- password = password + b'\x00' * (blocksize - len(password))
- inner.update(password.translate(_trans_36))
- outer.update(password.translate(_trans_5C))
-
- def prf(msg, inner=inner, outer=outer):
- # PBKDF2_HMAC uses the password as key. We can re-use the same
- # digest objects and just update copies to skip initialization.
- icpy = inner.copy()
- ocpy = outer.copy()
- icpy.update(msg)
- ocpy.update(icpy.digest())
- return ocpy.digest()
-
- if iterations < 1:
- raise ValueError(iterations)
- if dklen is None:
- dklen = outer.digest_size
- if dklen < 1:
- raise ValueError(dklen)
-
- dkey = b''
- loop = 1
- from_bytes = int.from_bytes
- while len(dkey) < dklen:
- prev = prf(salt + loop.to_bytes(4, 'big'))
- # endianness doesn't matter here as long to / from use the same
- rkey = int.from_bytes(prev, 'big')
- for i in range(iterations - 1):
- prev = prf(prev)
- # rkey = rkey ^ prev
- rkey ^= from_bytes(prev, 'big')
- loop += 1
- dkey += rkey.to_bytes(inner.digest_size, 'big')
-
- return dkey[:dklen]
+ raise # importing _hashlib should never fail on RHEL
try:
# OpenSSL's scrypt requires OpenSSL 1.1+
from _hashlib import scrypt
except ImportError:
- pass
+ raise # importing _hashlib should never fail on RHEL
for __func_name in __always_supported:
diff --git a/Lib/test/test_hashlib.py b/Lib/test/test_hashlib.py
index fa4a8d7..ec6c883 100644
--- a/Lib/test/test_hashlib.py
+++ b/Lib/test/test_hashlib.py
@@ -171,7 +171,13 @@ class HashLibTestCase(unittest.TestCase):
constructors.add(constructor)
def add_builtin_constructor(name):
- constructor = getattr(hashlib, "__get_builtin_constructor")(name)
+ try:
+ constructor = getattr(hashlib, "__get_builtin_constructor")(name)
+ except ValueError:
+ if get_fips_mode():
+ return
+ else:
+ raise
self.constructors_to_test[name].add(constructor)
_md5 = self._conditional_import_module('_md5')
@@ -266,6 +272,20 @@ class HashLibTestCase(unittest.TestCase):
def test_new_upper_to_lower(self):
self.assertEqual(hashlib.new("SHA256").name, "sha256")
+ @unittest.skipUnless(get_fips_mode(), "Builtin constructor only usable in FIPS mode")
+ def test_get_builtin_constructor_fips(self):
+ get_builtin_constructor = getattr(hashlib,
+ '__get_builtin_constructor')
+ with self.assertRaises(ValueError):
+ get_builtin_constructor('md5')
+ with self.assertRaises(ValueError):
+ get_builtin_constructor('sha256')
+ with self.assertRaises(ValueError):
+ get_builtin_constructor('blake2s')
+ with self.assertRaises(ValueError):
+ get_builtin_constructor('test')
+
+ @unittest.skipIf(get_fips_mode(), "No builtin constructors in FIPS mode")
def test_get_builtin_constructor(self):
get_builtin_constructor = getattr(hashlib,
'__get_builtin_constructor')
@@ -1061,6 +1081,7 @@ class KDFTests(unittest.TestCase):
iterations=1, dklen=None)
self.assertEqual(out, self.pbkdf2_results['sha1'][0][0])
+ @unittest.skip("The python implementation of pbkdf2_hmac has been removed")
@unittest.skipIf(builtin_hashlib is None, "test requires builtin_hashlib")
def test_pbkdf2_hmac_py(self):
self._test_pbkdf2_hmac(builtin_hashlib.pbkdf2_hmac, builtin_hashes)
--
2.37.3
From 016e7dbfd92bd24b5f7cb613786fb99456ca6069 Mon Sep 17 00:00:00 2001
From: Charalampos Stratakis <cstratak@redhat.com>
Date: Wed, 31 Jul 2019 15:43:43 +0200
Subject: [PATCH 08/10] Test equivalence of hashes for the various digests with
usedforsecurity=True/False
---
Lib/test/test_fips.py | 24 +++++++++++++++++++++
Lib/test/test_hashlib.py | 46 ++++++++++++++++++++++++++++++----------
2 files changed, 59 insertions(+), 11 deletions(-)
create mode 100644 Lib/test/test_fips.py
diff --git a/Lib/test/test_fips.py b/Lib/test/test_fips.py
new file mode 100644
index 0000000..1f99dd7
--- /dev/null
+++ b/Lib/test/test_fips.py
@@ -0,0 +1,24 @@
+import unittest
+import hashlib, _hashlib
+
+
+
+class HashlibFipsTests(unittest.TestCase):
+
+ @unittest.skipUnless(_hashlib.get_fips_mode(), "Test only when FIPS is enabled")
+ def test_fips_imports(self):
+ """blake2s and blake2b should fail to import in FIPS mode
+ """
+ with self.assertRaises(ValueError, msg='blake2s not available in FIPS'):
+ m = hashlib.blake2s()
+ with self.assertRaises(ValueError, msg='blake2b not available in FIPS'):
+ m = hashlib.blake2b()
+
+ @unittest.skipIf(_hashlib.get_fips_mode(), "blake2 hashes are not available under FIPS")
+ def test_blake2_hashes(self):
+ self.assertEqual(hashlib.blake2b(b'abc').hexdigest(), _hashlib.openssl_blake2b(b'abc').hexdigest())
+ self.assertEqual(hashlib.blake2s(b'abc').hexdigest(), _hashlib.openssl_blake2s(b'abc').hexdigest())
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/Lib/test/test_hashlib.py b/Lib/test/test_hashlib.py
index ec6c883..0fd036f 100644
--- a/Lib/test/test_hashlib.py
+++ b/Lib/test/test_hashlib.py
@@ -20,6 +20,7 @@ import warnings
from test import support
from test.support import _4G, bigmemtest, import_fresh_module
from http.client import HTTPException
+from functools import partial
# Were we compiled --with-pydebug or with #define Py_DEBUG?
COMPILED_WITH_PYDEBUG = hasattr(sys, 'gettotalrefcount')
@@ -55,6 +56,11 @@ except ImportError:
def get_fips_mode():
return 0
+if get_fips_mode():
+ FIPS_DISABLED = {'md5'}
+else:
+ FIPS_DISABLED = set()
+
try:
import _blake2
except ImportError:
@@ -98,6 +104,11 @@ def read_vectors(hash_name):
parts[0] = bytes.fromhex(parts[0])
yield parts
+def _is_blake2_constructor(constructor):
+ if isinstance(constructor, partial):
+ constructor = constructor.func
+ return getattr(constructor, '__name__', '').startswith('openssl_blake2')
+
class HashLibTestCase(unittest.TestCase):
supported_hash_names = ( 'md5', 'MD5', 'sha1', 'SHA1',
@@ -142,15 +153,21 @@ class HashLibTestCase(unittest.TestCase):
continue
self.constructors_to_test[algorithm] = set()
+ def _add_constructor(algorithm, constructor):
+ constructors.add(partial(constructor, usedforsecurity=False))
+ if algorithm not in FIPS_DISABLED:
+ constructors.add(constructor)
+ constructors.add(partial(constructor, usedforsecurity=True))
+
# For each algorithm, test the direct constructor and the use
# of hashlib.new given the algorithm name.
for algorithm, constructors in self.constructors_to_test.items():
- constructors.add(getattr(hashlib, algorithm))
+ _add_constructor(algorithm, getattr(hashlib, algorithm))
def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm, **kwargs):
if data is None:
return hashlib.new(_alg, **kwargs)
return hashlib.new(_alg, data, **kwargs)
- constructors.add(_test_algorithm_via_hashlib_new)
+ _add_constructor(algorithm, _test_algorithm_via_hashlib_new)
_hashlib = self._conditional_import_module('_hashlib')
self._hashlib = _hashlib
@@ -162,13 +179,7 @@ class HashLibTestCase(unittest.TestCase):
for algorithm, constructors in self.constructors_to_test.items():
constructor = getattr(_hashlib, 'openssl_'+algorithm, None)
if constructor:
- try:
- constructor()
- except ValueError:
- # default constructor blocked by crypto policy
- pass
- else:
- constructors.add(constructor)
+ _add_constructor(algorithm, constructor)
def add_builtin_constructor(name):
try:
@@ -346,6 +357,8 @@ class HashLibTestCase(unittest.TestCase):
self.assertIn(h.name, self.supported_hash_names)
else:
self.assertNotIn(h.name, self.supported_hash_names)
+ if not h.name.startswith('blake2') and h.name not in FIPS_DISABLED:
+ self.assertEqual(h.name, hashlib.new(h.name).name)
self.assertEqual(
h.name,
hashlib.new(h.name, usedforsecurity=False).name
@@ -392,8 +405,10 @@ class HashLibTestCase(unittest.TestCase):
for hash_object_constructor in constructors:
# OpenSSL's blake2s & blake2d don't support `key`
- _name = hash_object_constructor.__name__
- if 'key' in kwargs and _name.startswith('openssl_blake2'):
+ if (
+ 'key' in kwargs
+ and _is_blake2_constructor(hash_object_constructor)
+ ):
return
m = hash_object_constructor(data, **kwargs)
@@ -974,6 +989,15 @@ class HashLibTestCase(unittest.TestCase):
):
HASHXOF()
+ @unittest.skipUnless(get_fips_mode(), 'Needs FIPS mode.')
+ def test_usedforsecurity_repeat(self):
+ """Make sure usedforsecurity flag isn't copied to other contexts"""
+ for i in range(3):
+ for cons in hashlib.md5, partial(hashlib.new, 'md5'):
+ self.assertRaises(ValueError, cons)
+ self.assertRaises(ValueError, partial(cons, usedforsecurity=True))
+ self.assertEqual(cons(usedforsecurity=False).hexdigest(),
+ 'd41d8cd98f00b204e9800998ecf8427e')
class KDFTests(unittest.TestCase):
--
2.37.3
From 7c7a3260746d06d5f319944dc40d51f7642d92dc Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Mon, 26 Aug 2019 19:39:48 +0200
Subject: [PATCH 09/10] Guard against Python HMAC in FIPS mode
---
Lib/hmac.py | 13 +++++++++----
Lib/test/test_hmac.py | 10 ++++++++++
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/Lib/hmac.py b/Lib/hmac.py
index 8b4f920..20ef96c 100644
--- a/Lib/hmac.py
+++ b/Lib/hmac.py
@@ -16,8 +16,9 @@ else:
import hashlib as _hashlib
-trans_5C = bytes((x ^ 0x5C) for x in range(256))
-trans_36 = bytes((x ^ 0x36) for x in range(256))
+if not _hashopenssl.get_fips_mode():
+ trans_5C = bytes((x ^ 0x5C) for x in range(256))
+ trans_36 = bytes((x ^ 0x36) for x in range(256))
# The size of the digests returned by HMAC depends on the underlying
# hashing module used. Use digest_size from the instance of HMAC instead.
@@ -48,17 +49,18 @@ class HMAC:
msg argument. Passing it as a keyword argument is
recommended, though not required for legacy API reasons.
"""
-
if not isinstance(key, (bytes, bytearray)):
raise TypeError("key: expected bytes or bytearray, but got %r" % type(key).__name__)
if not digestmod:
raise TypeError("Missing required parameter 'digestmod'.")
- if _hashopenssl and isinstance(digestmod, (str, _functype)):
+ if _hashopenssl.get_fips_mode() or (_hashopenssl and isinstance(digestmod, (str, _functype))):
try:
self._init_hmac(key, msg, digestmod)
except _hashopenssl.UnsupportedDigestmodError:
+ if _hashopenssl.get_fips_mode():
+ raise
self._init_old(key, msg, digestmod)
else:
self._init_old(key, msg, digestmod)
@@ -69,6 +71,9 @@ class HMAC:
self.block_size = self._hmac.block_size
def _init_old(self, key, msg, digestmod):
+ if _hashopenssl.get_fips_mode():
+ # In FIPS mode, use OpenSSL anyway: raise the appropriate error
+ return self._init_hmac(key, msg, digestmod)
if callable(digestmod):
digest_cons = digestmod
elif isinstance(digestmod, str):
diff --git a/Lib/test/test_hmac.py b/Lib/test/test_hmac.py
index adf52ad..41e6a14 100644
--- a/Lib/test/test_hmac.py
+++ b/Lib/test/test_hmac.py
@@ -5,6 +5,7 @@ import hashlib
import unittest
import unittest.mock
import warnings
+from _hashlib import get_fips_mode
from test.support import hashlib_helper
@@ -339,6 +340,7 @@ class TestVectorsTestCase(unittest.TestCase):
def test_sha512_rfc4231(self):
self._rfc4231_test_cases(hashlib.sha512, 'sha512', 64, 128)
+ #unittest.skipIf(get_fips_mode(), 'MockCrazyHash unacceptable in FIPS mode.')
@hashlib_helper.requires_hashdigest('sha256')
def test_legacy_block_size_warnings(self):
class MockCrazyHash(object):
@@ -351,6 +353,11 @@ class TestVectorsTestCase(unittest.TestCase):
def digest(self):
return self._x.digest()
+ if get_fips_mode():
+ with self.assertRaises(ValueError):
+ hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
+ return
+
with warnings.catch_warnings():
warnings.simplefilter('error', RuntimeWarning)
with self.assertRaises(RuntimeWarning):
@@ -444,6 +451,7 @@ class ConstructorTestCase(unittest.TestCase):
):
C_HMAC()
+ @unittest.skipIf(get_fips_mode(), "_sha256 unavailable in FIPS mode")
@unittest.skipUnless(sha256_module is not None, 'need _sha256')
def test_with_sha256_module(self):
h = hmac.HMAC(b"key", b"hash this!", digestmod=sha256_module.sha256)
@@ -472,6 +480,7 @@ class SanityTestCase(unittest.TestCase):
class CopyTestCase(unittest.TestCase):
+ @unittest.skipIf(get_fips_mode(), "_init_old unavailable in FIPS mode")
@hashlib_helper.requires_hashdigest('sha256')
def test_attributes_old(self):
# Testing if attributes are of same type.
@@ -483,6 +492,7 @@ class CopyTestCase(unittest.TestCase):
self.assertEqual(type(h1._outer), type(h2._outer),
"Types of outer don't match.")
+ @unittest.skipIf(get_fips_mode(), "_init_old unavailable in FIPS mode")
@hashlib_helper.requires_hashdigest('sha256')
def test_realcopy_old(self):
# Testing if the copy method created a real copy.
--
2.37.3
From 0db6e1bad3663006fe9352819bbbb53bfc5637be Mon Sep 17 00:00:00 2001
From: Petr Viktorin <encukou@gmail.com>
Date: Wed, 25 Aug 2021 16:44:43 +0200
Subject: [PATCH 10/10] Disable hash-based PYCs in FIPS mode
If FIPS mode is on, we can't use siphash-based HMAC
(_Py_KeyedHash), so:
- Unchecked hash PYCs can be imported, but not created
- Checked hash PYCs can not be imported nor created
- The default mode is timestamp-based PYCs, even if
SOURCE_DATE_EPOCH is set.
If FIPS mode is off, there are no changes in behavior.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1835169
---
Lib/py_compile.py | 2 ++
Lib/test/support/__init__.py | 14 +++++++++++++
Lib/test/test_cmd_line_script.py | 2 ++
Lib/test/test_compileall.py | 11 +++++++++-
Lib/test/test_imp.py | 2 ++
.../test_importlib/source/test_file_loader.py | 6 ++++++
Lib/test/test_py_compile.py | 11 ++++++++--
Lib/test/test_zipimport.py | 2 ++
Python/import.c | 20 +++++++++++++++++++
9 files changed, 67 insertions(+), 3 deletions(-)
diff --git a/Lib/py_compile.py b/Lib/py_compile.py
index bba3642..02db901 100644
--- a/Lib/py_compile.py
+++ b/Lib/py_compile.py
@@ -70,7 +70,9 @@ class PycInvalidationMode(enum.Enum):
def _get_default_invalidation_mode():
+ import _hashlib
if (os.environ.get('SOURCE_DATE_EPOCH') and not
+ _hashlib.get_fips_mode() and not
os.environ.get('RPM_BUILD_ROOT')):
return PycInvalidationMode.CHECKED_HASH
else:
diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 6dc0813..b9d5f9a 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -3296,6 +3296,20 @@ def clear_ignored_deprecations(*tokens: object) -> None:
warnings._filters_mutated()
+def fails_in_fips_mode(expected_error):
+ import _hashlib
+ if _hashlib.get_fips_mode():
+ def _decorator(func):
+ def _wrapper(self, *args, **kwargs):
+ with self.assertRaises(expected_error):
+ func(self, *args, **kwargs)
+ return _wrapper
+ else:
+ def _decorator(func):
+ return func
+ return _decorator
+
+
@contextlib.contextmanager
def adjust_int_max_str_digits(max_digits):
"""Temporarily change the integer string conversion length limit."""
diff --git a/Lib/test/test_cmd_line_script.py b/Lib/test/test_cmd_line_script.py
index 7cb1370..61df232 100644
--- a/Lib/test/test_cmd_line_script.py
+++ b/Lib/test/test_cmd_line_script.py
@@ -282,6 +282,7 @@ class CmdLineTest(unittest.TestCase):
self._check_script(zip_name, run_name, zip_name, zip_name, '',
zipimport.zipimporter)
+ @support.fails_in_fips_mode(ImportError)
def test_zipfile_compiled_checked_hash(self):
with support.temp_dir() as script_dir:
script_name = _make_test_script(script_dir, '__main__')
@@ -292,6 +293,7 @@ class CmdLineTest(unittest.TestCase):
self._check_script(zip_name, run_name, zip_name, zip_name, '',
zipimport.zipimporter)
+ @support.fails_in_fips_mode(ImportError)
def test_zipfile_compiled_unchecked_hash(self):
with support.temp_dir() as script_dir:
script_name = _make_test_script(script_dir, '__main__')
diff --git a/Lib/test/test_compileall.py b/Lib/test/test_compileall.py
index ab647d6..7d50f07 100644
--- a/Lib/test/test_compileall.py
+++ b/Lib/test/test_compileall.py
@@ -758,14 +758,23 @@ class CommandLineTestsBase:
out = self.assertRunOK('badfilename')
self.assertRegex(out, b"Can't list 'badfilename'")
- def test_pyc_invalidation_mode(self):
+ @support.fails_in_fips_mode(AssertionError)
+ def test_pyc_invalidation_mode_checked(self):
script_helper.make_script(self.pkgdir, 'f1', '')
pyc = importlib.util.cache_from_source(
os.path.join(self.pkgdir, 'f1.py'))
+
self.assertRunOK('--invalidation-mode=checked-hash', self.pkgdir)
with open(pyc, 'rb') as fp:
data = fp.read()
self.assertEqual(int.from_bytes(data[4:8], 'little'), 0b11)
+
+ @support.fails_in_fips_mode(AssertionError)
+ def test_pyc_invalidation_mode_unchecked(self):
+ script_helper.make_script(self.pkgdir, 'f1', '')
+ pyc = importlib.util.cache_from_source(
+ os.path.join(self.pkgdir, 'f1.py'))
+
self.assertRunOK('--invalidation-mode=unchecked-hash', self.pkgdir)
with open(pyc, 'rb') as fp:
data = fp.read()
diff --git a/Lib/test/test_imp.py b/Lib/test/test_imp.py
index fe394dc..802f0e8 100644
--- a/Lib/test/test_imp.py
+++ b/Lib/test/test_imp.py
@@ -343,6 +343,7 @@ class ImportTests(unittest.TestCase):
import _frozen_importlib
self.assertEqual(_frozen_importlib.__spec__.origin, "frozen")
+ @support.fails_in_fips_mode(ImportError)
def test_source_hash(self):
self.assertEqual(_imp.source_hash(42, b'hi'), b'\xc6\xe7Z\r\x03:}\xab')
self.assertEqual(_imp.source_hash(43, b'hi'), b'\x85\x9765\xf8\x9a\x8b9')
@@ -362,6 +363,7 @@ class ImportTests(unittest.TestCase):
res = script_helper.assert_python_ok(*args)
self.assertEqual(res.out.strip().decode('utf-8'), expected)
+ @support.fails_in_fips_mode(ImportError)
def test_find_and_load_checked_pyc(self):
# issue 34056
with support.temp_cwd():
diff --git a/Lib/test/test_importlib/source/test_file_loader.py b/Lib/test/test_importlib/source/test_file_loader.py
index ab44722..480cc81 100644
--- a/Lib/test/test_importlib/source/test_file_loader.py
+++ b/Lib/test/test_importlib/source/test_file_loader.py
@@ -17,6 +17,7 @@ import types
import unittest
import warnings
+from test import support
from test.support import make_legacy_pyc, unload
from test.test_py_compile import without_source_date_epoch
@@ -239,6 +240,7 @@ class SimpleTest(abc.LoaderTests):
loader.load_module('bad name')
@util.writes_bytecode_files
+ @support.fails_in_fips_mode(ImportError)
def test_checked_hash_based_pyc(self):
with util.create_modules('_temp') as mapping:
source = mapping['_temp']
@@ -270,6 +272,7 @@ class SimpleTest(abc.LoaderTests):
)
@util.writes_bytecode_files
+ @support.fails_in_fips_mode(ImportError)
def test_overridden_checked_hash_based_pyc(self):
with util.create_modules('_temp') as mapping, \
unittest.mock.patch('_imp.check_hash_based_pycs', 'never'):
@@ -295,6 +298,7 @@ class SimpleTest(abc.LoaderTests):
self.assertEqual(mod.state, 'old')
@util.writes_bytecode_files
+ @support.fails_in_fips_mode(ImportError)
def test_unchecked_hash_based_pyc(self):
with util.create_modules('_temp') as mapping:
source = mapping['_temp']
@@ -325,6 +329,7 @@ class SimpleTest(abc.LoaderTests):
)
@util.writes_bytecode_files
+ @support.fails_in_fips_mode(ImportError)
def test_overridden_unchecked_hash_based_pyc(self):
with util.create_modules('_temp') as mapping, \
unittest.mock.patch('_imp.check_hash_based_pycs', 'always'):
@@ -434,6 +439,7 @@ class BadBytecodeTest:
del_source=del_source)
test('_temp', mapping, bc_path)
+ @support.fails_in_fips_mode(ImportError)
def _test_partial_hash(self, test, *, del_source=False):
with util.create_modules('_temp') as mapping:
bc_path = self.manipulate_bytecode(
diff --git a/Lib/test/test_py_compile.py b/Lib/test/test_py_compile.py
index b2d3dcf..7e4b0c5 100644
--- a/Lib/test/test_py_compile.py
+++ b/Lib/test/test_py_compile.py
@@ -141,13 +141,16 @@ class PyCompileTestsBase:
importlib.util.cache_from_source(bad_coding)))
def test_source_date_epoch(self):
+ import _hashlib
py_compile.compile(self.source_path, self.pyc_path)
self.assertTrue(os.path.exists(self.pyc_path))
self.assertFalse(os.path.exists(self.cache_path))
with open(self.pyc_path, 'rb') as fp:
flags = importlib._bootstrap_external._classify_pyc(
fp.read(), 'test', {})
- if os.environ.get('SOURCE_DATE_EPOCH'):
+ if _hashlib.get_fips_mode():
+ expected_flags = 0b00
+ elif os.environ.get('SOURCE_DATE_EPOCH'):
expected_flags = 0b11
else:
expected_flags = 0b00
@@ -178,7 +181,8 @@ class PyCompileTestsBase:
# Specifying optimized bytecode should lead to a path reflecting that.
self.assertIn('opt-2', py_compile.compile(self.source_path, optimize=2))
- def test_invalidation_mode(self):
+ @support.fails_in_fips_mode(ImportError)
+ def test_invalidation_mode_checked(self):
py_compile.compile(
self.source_path,
invalidation_mode=py_compile.PycInvalidationMode.CHECKED_HASH,
@@ -187,6 +191,9 @@ class PyCompileTestsBase:
flags = importlib._bootstrap_external._classify_pyc(
fp.read(), 'test', {})
self.assertEqual(flags, 0b11)
+
+ @support.fails_in_fips_mode(ImportError)
+ def test_invalidation_mode_unchecked(self):
py_compile.compile(
self.source_path,
invalidation_mode=py_compile.PycInvalidationMode.UNCHECKED_HASH,
diff --git a/Lib/test/test_zipimport.py b/Lib/test/test_zipimport.py
index b7347a3..09ea990 100644
--- a/Lib/test/test_zipimport.py
+++ b/Lib/test/test_zipimport.py
@@ -186,6 +186,7 @@ class UncompressedZipImportTestCase(ImportHooksBaseTestCase):
TESTMOD + pyc_ext: (NOW, test_pyc)}
self.doTest(pyc_ext, files, TESTMOD)
+ @support.fails_in_fips_mode(ImportError)
def testUncheckedHashBasedPyc(self):
source = b"state = 'old'"
source_hash = importlib.util.source_hash(source)
@@ -200,6 +201,7 @@ class UncompressedZipImportTestCase(ImportHooksBaseTestCase):
self.assertEqual(mod.state, 'old')
self.doTest(None, files, TESTMOD, call=check)
+ @support.fails_in_fips_mode(ImportError)
@unittest.mock.patch('_imp.check_hash_based_pycs', 'always')
def test_checked_hash_based_change_pyc(self):
source = b"state = 'old'"
diff --git a/Python/import.c b/Python/import.c
index 8358d70..1b7fb85 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -2354,6 +2354,26 @@ static PyObject *
_imp_source_hash_impl(PyObject *module, long key, Py_buffer *source)
/*[clinic end generated code: output=edb292448cf399ea input=9aaad1e590089789]*/
{
+ PyObject *_hashlib = PyImport_ImportModule("_hashlib");
+ if (_hashlib == NULL) {
+ return NULL;
+ }
+ PyObject *fips_mode_obj = PyObject_CallMethod(_hashlib, "get_fips_mode", NULL);
+ Py_DECREF(_hashlib);
+ if (fips_mode_obj == NULL) {
+ return NULL;
+ }
+ int fips_mode = PyObject_IsTrue(fips_mode_obj);
+ Py_DECREF(fips_mode_obj);
+ if (fips_mode < 0) {
+ return NULL;
+ }
+ if (fips_mode) {
+ PyErr_SetString(
+ PyExc_ImportError,
+ "hash-based PYC validation (siphash24) not available in FIPS mode");
+ return NULL;
+ };
union {
uint64_t x;
char data[sizeof(uint64_t)];
--
2.37.3
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