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python2/00146-hashlib-fips.patch

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From ece76465680b0df5b3fce7bf8ff1ff0253933889 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Mon, 2 Sep 2019 17:33:29 +0200
Subject: [PATCH 01/11] Remove HASH_OBJ_CONSTRUCTOR
See https://github.com/python/cpython/commit/c7e219132aff1e21cb9ccb0a9b570dc6c750039b
---
Modules/_hashopenssl.c | 59 ------------------------------------------
1 file changed, 59 deletions(-)
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 78445ebabdd3..cb81e9765251 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -48,10 +48,6 @@
* to allow the user to optimize based on the platform they're using. */
#define HASHLIB_GIL_MINSIZE 2048
-#ifndef HASH_OBJ_CONSTRUCTOR
-#define HASH_OBJ_CONSTRUCTOR 0
-#endif
-
#if defined(OPENSSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x00908000)
#define _OPENSSL_SUPPORTS_SHA2
#endif
@@ -384,53 +380,6 @@ EVP_repr(PyObject *self)
return PyString_FromString(buf);
}
-#if HASH_OBJ_CONSTRUCTOR
-static int
-EVP_tp_init(EVPobject *self, PyObject *args, PyObject *kwds)
-{
- static char *kwlist[] = {"name", "string", NULL};
- PyObject *name_obj = NULL;
- Py_buffer view = { 0 };
- char *nameStr;
- const EVP_MD *digest;
-
- if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|s*:HASH", kwlist,
- &name_obj, &view)) {
- return -1;
- }
-
- if (!PyArg_Parse(name_obj, "s", &nameStr)) {
- PyErr_SetString(PyExc_TypeError, "name must be a string");
- PyBuffer_Release(&view);
- return -1;
- }
-
- digest = EVP_get_digestbyname(nameStr);
- if (!digest) {
- PyErr_SetString(PyExc_ValueError, "unknown hash function");
- PyBuffer_Release(&view);
- return -1;
- }
- EVP_DigestInit(self->ctx, digest);
-
- self->name = name_obj;
- Py_INCREF(self->name);
-
- if (view.obj) {
- if (view.len >= HASHLIB_GIL_MINSIZE) {
- Py_BEGIN_ALLOW_THREADS
- EVP_hash(self, view.buf, view.len);
- Py_END_ALLOW_THREADS
- } else {
- EVP_hash(self, view.buf, view.len);
- }
- PyBuffer_Release(&view);
- }
-
- return 0;
-}
-#endif
-
PyDoc_STRVAR(hashtype_doc,
"A hash represents the object used to calculate a checksum of a\n\
@@ -487,9 +436,6 @@ static PyTypeObject EVPtype = {
0, /* tp_descr_set */
0, /* tp_dictoffset */
#endif
-#if HASH_OBJ_CONSTRUCTOR
- (initproc)EVP_tp_init, /* tp_init */
-#endif
};
static PyObject *
@@ -928,11 +874,6 @@ init_hashlib(void)
return;
}
-#if HASH_OBJ_CONSTRUCTOR
- Py_INCREF(&EVPtype);
- PyModule_AddObject(m, "HASH", (PyObject *)&EVPtype);
-#endif
-
/* these constants are used by the convenience constructors */
INIT_CONSTRUCTOR_CONSTANTS(md5);
INIT_CONSTRUCTOR_CONSTANTS(sha1);
From d7339af75678c760f6d6c0eb455b0eb889c22574 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Mon, 2 Sep 2019 18:02:25 +0200
Subject: [PATCH 02/11] Add the usedforsecurity argument to _hashopenssl
---
Modules/_hashopenssl.c | 63 ++++++++++++++++++++++++++++++++----------
1 file changed, 48 insertions(+), 15 deletions(-)
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index cb81e9765251..f2dbc095cc66 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -441,7 +441,7 @@ static PyTypeObject EVPtype = {
static PyObject *
EVPnew(PyObject *name_obj,
const EVP_MD *digest, const EVP_MD_CTX *initial_ctx,
- const unsigned char *cp, Py_ssize_t len)
+ const unsigned char *cp, Py_ssize_t len, int usedforsecurity)
{
EVPobject *self;
@@ -456,7 +456,23 @@ EVPnew(PyObject *name_obj,
if (initial_ctx) {
EVP_MD_CTX_copy(self->ctx, initial_ctx);
} else {
- EVP_DigestInit(self->ctx, digest);
+ EVP_MD_CTX_init(self->ctx);
+
+ /*
+ If the user has declared that this digest is being used in a
+ non-security role (e.g. indexing into a data structure), set
+ the exception flag for openssl to allow it
+ */
+ if (!usedforsecurity) {
+#ifdef EVP_MD_CTX_FLAG_NON_FIPS_ALLOW
+ EVP_MD_CTX_set_flags(self->ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
+#endif
+ }
+ if (!EVP_DigestInit_ex(self->ctx, digest, NULL)) {
+ _setException(PyExc_ValueError);
+ Py_DECREF(self);
+ return NULL;
+ }
}
if (cp && len) {
@@ -485,15 +501,16 @@ The MD5 and SHA1 algorithms are always supported.\n");
static PyObject *
EVP_new(PyObject *self, PyObject *args, PyObject *kwdict)
{
- static char *kwlist[] = {"name", "string", NULL};
+ static char *kwlist[] = {"name", "string", "usedforsecurity", NULL};
PyObject *name_obj = NULL;
Py_buffer view = { 0 };
PyObject *ret_obj;
char *name;
const EVP_MD *digest;
+ int usedforsecurity = 1;
- if (!PyArg_ParseTupleAndKeywords(args, kwdict, "O|s*:new", kwlist,
- &name_obj, &view)) {
+ if (!PyArg_ParseTupleAndKeywords(args, kwdict, "O|s*i:new", kwlist,
+ &name_obj, &view, &usedforsecurity)) {
return NULL;
}
@@ -506,7 +523,7 @@ EVP_new(PyObject *self, PyObject *args, PyObject *kwdict)
digest = EVP_get_digestbyname(name);
ret_obj = EVPnew(name_obj, digest, NULL, (unsigned char*)view.buf,
- view.len);
+ view.len, usedforsecurity);
PyBuffer_Release(&view);
return ret_obj;
@@ -771,30 +788,46 @@ generate_hash_name_list(void)
* the generic one passing it a python string and are noticeably
* faster than calling a python new() wrapper. Thats important for
* code that wants to make hashes of a bunch of small strings.
+ *
+ * For usedforsecurity=False, the optimization is not used.
*/
#define GEN_CONSTRUCTOR(NAME) \
static PyObject * \
- EVP_new_ ## NAME (PyObject *self, PyObject *args) \
+ EVP_new_ ## NAME (PyObject *self, PyObject *args, PyObject *kwdict) \
{ \
+ static char *kwlist[] = {"string", "usedforsecurity", NULL}; \
Py_buffer view = { 0 }; \
PyObject *ret_obj; \
+ int usedforsecurity=1; \
\
- if (!PyArg_ParseTuple(args, "|s*:" #NAME , &view)) { \
+ if (!PyArg_ParseTupleAndKeywords( \
+ args, kwdict, "|s*i:" #NAME, kwlist, \
+ &view, &usedforsecurity \
+ )) { \
return NULL; \
} \
- \
- ret_obj = EVPnew( \
- CONST_ ## NAME ## _name_obj, \
- NULL, \
- CONST_new_ ## NAME ## _ctx_p, \
- (unsigned char*)view.buf, view.len); \
+ if (usedforsecurity == 0) { \
+ ret_obj = EVPnew( \
+ CONST_ ## NAME ## _name_obj, \
+ EVP_get_digestbyname(#NAME), \
+ NULL, \
+ (unsigned char*)view.buf, view.len, \
+ usedforsecurity); \
+ } else { \
+ ret_obj = EVPnew( \
+ CONST_ ## NAME ## _name_obj, \
+ NULL, \
+ CONST_new_ ## NAME ## _ctx_p, \
+ (unsigned char*)view.buf, view.len, \
+ usedforsecurity); \
+ } \
PyBuffer_Release(&view); \
return ret_obj; \
}
/* a PyMethodDef structure for the constructor */
#define CONSTRUCTOR_METH_DEF(NAME) \
- {"openssl_" #NAME, (PyCFunction)EVP_new_ ## NAME, METH_VARARGS, \
+ {"openssl_" #NAME, (PyCFunction)EVP_new_ ## NAME, METH_VARARGS|METH_KEYWORDS, \
PyDoc_STR("Returns a " #NAME \
" hash object; optionally initialized with a string") \
}
From c8102e61fb3ade364d4bb7f2fe3f3452e2018ecd Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Mon, 2 Sep 2019 17:59:53 +0200
Subject: [PATCH 03/11] hashlib.py: Avoid the builtin constructor
---
Lib/hashlib.py | 58 +++++++++++++-------------------------------------
1 file changed, 15 insertions(+), 43 deletions(-)
diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index bbd06b9996ee..404ed6891fb9 100644
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -69,65 +69,37 @@
'pbkdf2_hmac')
-def __get_builtin_constructor(name):
- try:
- if name in ('SHA1', 'sha1'):
- import _sha
- return _sha.new
- elif name in ('MD5', 'md5'):
- import _md5
- return _md5.new
- elif name in ('SHA256', 'sha256', 'SHA224', 'sha224'):
- import _sha256
- bs = name[3:]
- if bs == '256':
- return _sha256.sha256
- elif bs == '224':
- return _sha256.sha224
- elif name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
- import _sha512
- bs = name[3:]
- if bs == '512':
- return _sha512.sha512
- elif bs == '384':
- return _sha512.sha384
- except ImportError:
- pass # no extension module, this hash is unsupported.
-
- raise ValueError('unsupported hash type ' + name)
-
-
def __get_openssl_constructor(name):
try:
f = getattr(_hashlib, 'openssl_' + name)
# Allow the C module to raise ValueError. The function will be
# defined but the hash not actually available thanks to OpenSSL.
- f()
+ #
+ # We pass "usedforsecurity=False" to disable FIPS-based restrictions:
+ # at this stage we're merely seeing if the function is callable,
+ # rather than using it for actual work.
+ f(usedforsecurity=False)
# Use the C function directly (very fast)
return f
except (AttributeError, ValueError):
- return __get_builtin_constructor(name)
-
-
-def __py_new(name, string=''):
- """new(name, string='') - Return a new hashing object using the named algorithm;
- optionally initialized with a string.
- """
- return __get_builtin_constructor(name)(string)
+ raise
-def __hash_new(name, string=''):
- """new(name, string='') - Return a new hashing object using the named algorithm;
- optionally initialized with a string.
+def __hash_new(name, string='', usedforsecurity=True):
+ """new(name, string='', usedforsecurity=True) - Return a new hashing object
+ using the named algorithm; optionally initialized with a string.
+
+ Override 'usedforsecurity' to False when using for non-security purposes in
+ a FIPS environment
"""
try:
- return _hashlib.new(name, string)
+ return _hashlib.new(name, string, usedforsecurity)
except ValueError:
# If the _hashlib module (OpenSSL) doesn't support the named
# hash, try using our builtin implementations.
# This allows for SHA224/256 and SHA384/512 support even though
# the OpenSSL library prior to 0.9.8 doesn't provide them.
- return __get_builtin_constructor(name)(string)
+ raise
try:
@@ -218,4 +190,4 @@ def prf(msg, inner=inner, outer=outer):
# Cleanup locals()
del __always_supported, __func_name, __get_hash
-del __py_new, __hash_new, __get_openssl_constructor
+del __hash_new, __get_openssl_constructor
From 2ade3e5a6c5732c0692c4cc2235a2bbe0948f50b Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Mon, 2 Sep 2019 17:56:46 +0200
Subject: [PATCH 04/11] Adjust docstrings & comments
---
Lib/hashlib.py | 29 ++++++++++++++++++++++-------
Modules/_hashopenssl.c | 9 ++++++++-
2 files changed, 30 insertions(+), 8 deletions(-)
diff --git a/Lib/hashlib.py b/Lib/hashlib.py
index 404ed6891fb9..46d0b470ab4a 100644
--- a/Lib/hashlib.py
+++ b/Lib/hashlib.py
@@ -6,9 +6,12 @@
__doc__ = """hashlib module - A common interface to many hash functions.
-new(name, string='') - returns a new hash object implementing the
- given hash function; initializing the hash
- using the given string data.
+new(name, string='', usedforsecurity=True)
+ - returns a new hash object implementing the given hash function;
+ initializing the hash using the given string data.
+
+ "usedforsecurity" is a non-standard extension for better supporting
+ FIPS-compliant environments (see below)
Named constructor functions are also available, these are much faster
than using new():
@@ -25,6 +28,20 @@
Choose your hash function wisely. Some have known collision weaknesses.
sha384 and sha512 will be slow on 32 bit platforms.
+Our implementation of hashlib uses OpenSSL.
+
+OpenSSL has a "FIPS mode", which, if enabled, may restrict the available hashes
+to only those that are compliant with FIPS regulations. For example, it may
+deny the use of MD5, on the grounds that this is not secure for uses such as
+authentication, system integrity checking, or digital signatures.
+
+If you need to use such a hash for non-security purposes (such as indexing into
+a data structure for speed), you can override the keyword argument
+"usedforsecurity" from True to False to signify that your code is not relying
+on the hash for security purposes, and this will allow the hash to be usable
+even in FIPS mode. This is not a standard feature of Python 2.7's hashlib, and
+is included here to better support FIPS mode.
+
Hash objects have these methods:
- update(arg): Update the hash object with the string arg. Repeated calls
are equivalent to a single call with the concatenation of all
@@ -82,6 +99,7 @@ def __get_openssl_constructor(name):
# Use the C function directly (very fast)
return f
except (AttributeError, ValueError):
+ # RHEL only: Fallbacks removed; we always use OpenSSL for hashes.
raise
@@ -95,10 +113,7 @@ def __hash_new(name, string='', usedforsecurity=True):
try:
return _hashlib.new(name, string, usedforsecurity)
except ValueError:
- # If the _hashlib module (OpenSSL) doesn't support the named
- # hash, try using our builtin implementations.
- # This allows for SHA224/256 and SHA384/512 support even though
- # the OpenSSL library prior to 0.9.8 doesn't provide them.
+ # RHEL only: Fallbacks removed; we always use OpenSSL for hashes.
raise
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index f2dbc095cc66..d24432e048bf 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -496,7 +496,14 @@ PyDoc_STRVAR(EVP_new__doc__,
An optional string argument may be provided and will be\n\
automatically hashed.\n\
\n\
-The MD5 and SHA1 algorithms are always supported.\n");
+The MD5 and SHA1 algorithms are always supported.\n \
+\n\
+An optional \"usedforsecurity=True\" keyword argument is provided for use in\n\
+environments that enforce FIPS-based restrictions. Some implementations of\n\
+OpenSSL can be configured to prevent the usage of non-secure algorithms (such\n\
+as MD5). If you have a non-security use for these algorithms (e.g. a hash\n\
+table), you can override this argument by marking the callsite as\n\
+\"usedforsecurity=False\".");
static PyObject *
EVP_new(PyObject *self, PyObject *args, PyObject *kwdict)
From 6698e1d84c3f19bbb4438b2b2c78a5ef8bd5ad42 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Thu, 29 Aug 2019 10:25:28 +0200
Subject: [PATCH 05/11] Expose OpenSSL FIPS_mode as _hashlib.get_fips_mode
---
Modules/_hashopenssl.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index d24432e048bf..74f9ab9ec150 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -860,10 +860,32 @@ GEN_CONSTRUCTOR(sha384)
GEN_CONSTRUCTOR(sha512)
#endif
+static PyObject *
+_hashlib_get_fips_mode(PyObject *module, PyObject *unused)
+{
+ // XXX: This function skips error checking.
+ // This is only appropriate for RHEL.
+
+ // From the OpenSSL docs:
+ // "If the library was built without support of the FIPS Object Module,
+ // then the function will return 0 with an error code of
+ // CRYPTO_R_FIPS_MODE_NOT_SUPPORTED (0x0f06d065)."
+ // In RHEL:
+ // * we do build with FIPS, so the function always succeeds
+ // * even if it didn't, people seem used to errors being left on the
+ // OpenSSL error stack.
+
+ // For more info, see:
+ // https://bugzilla.redhat.com/show_bug.cgi?id=1745499
+
+ return PyInt_FromLong(FIPS_mode());
+}
+
/* List of functions exported by this module */
static struct PyMethodDef EVP_functions[] = {
{"new", (PyCFunction)EVP_new, METH_VARARGS|METH_KEYWORDS, EVP_new__doc__},
+ {"get_fips_mode", (PyCFunction)_hashlib_get_fips_mode, METH_NOARGS, NULL},
CONSTRUCTOR_METH_DEF(md5),
CONSTRUCTOR_METH_DEF(sha1),
#ifdef _OPENSSL_SUPPORTS_SHA2
From 9a8833619658c6be5ca72c60189a64da05536d85 Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Mon, 2 Sep 2019 18:00:26 +0200
Subject: [PATCH 06/11] Adjust tests
---
Lib/test/test_hashlib.py | 118 ++++++++++++++++++++++++---------------
1 file changed, 74 insertions(+), 44 deletions(-)
diff --git a/Lib/test/test_hashlib.py b/Lib/test/test_hashlib.py
index b8d6388feaf9..b03fc84f82b4 100644
--- a/Lib/test/test_hashlib.py
+++ b/Lib/test/test_hashlib.py
@@ -34,6 +34,8 @@ def hexstr(s):
r = r + h[(i >> 4) & 0xF] + h[i & 0xF]
return r
+from _hashlib import get_fips_mode
+
class HashLibTestCase(unittest.TestCase):
supported_hash_names = ( 'md5', 'MD5', 'sha1', 'SHA1',
@@ -63,10 +65,10 @@ def __init__(self, *args, **kwargs):
# of hashlib.new given the algorithm name.
for algorithm, constructors in self.constructors_to_test.items():
constructors.add(getattr(hashlib, algorithm))
- def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm):
+ def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm, usedforsecurity=True):
if data is None:
- return hashlib.new(_alg)
- return hashlib.new(_alg, data)
+ return hashlib.new(_alg, usedforsecurity=usedforsecurity)
+ return hashlib.new(_alg, data, usedforsecurity=usedforsecurity)
constructors.add(_test_algorithm_via_hashlib_new)
_hashlib = self._conditional_import_module('_hashlib')
@@ -80,28 +82,13 @@ def _test_algorithm_via_hashlib_new(data=None, _alg=algorithm):
if constructor:
constructors.add(constructor)
- _md5 = self._conditional_import_module('_md5')
- if _md5:
- self.constructors_to_test['md5'].add(_md5.new)
- _sha = self._conditional_import_module('_sha')
- if _sha:
- self.constructors_to_test['sha1'].add(_sha.new)
- _sha256 = self._conditional_import_module('_sha256')
- if _sha256:
- self.constructors_to_test['sha224'].add(_sha256.sha224)
- self.constructors_to_test['sha256'].add(_sha256.sha256)
- _sha512 = self._conditional_import_module('_sha512')
- if _sha512:
- self.constructors_to_test['sha384'].add(_sha512.sha384)
- self.constructors_to_test['sha512'].add(_sha512.sha512)
-
super(HashLibTestCase, self).__init__(*args, **kwargs)
def test_hash_array(self):
a = array.array("b", range(10))
constructors = self.constructors_to_test.itervalues()
for cons in itertools.chain.from_iterable(constructors):
- c = cons(a)
+ c = cons(a, usedforsecurity=False)
c.hexdigest()
def test_algorithms_attribute(self):
@@ -122,28 +109,9 @@ def test_unknown_hash(self):
self.assertRaises(ValueError, hashlib.new, 'spam spam spam spam spam')
self.assertRaises(TypeError, hashlib.new, 1)
- def test_get_builtin_constructor(self):
- get_builtin_constructor = hashlib.__dict__[
- '__get_builtin_constructor']
- self.assertRaises(ValueError, get_builtin_constructor, 'test')
- try:
- import _md5
- except ImportError:
- pass
- # This forces an ImportError for "import _md5" statements
- sys.modules['_md5'] = None
- try:
- self.assertRaises(ValueError, get_builtin_constructor, 'md5')
- finally:
- if '_md5' in locals():
- sys.modules['_md5'] = _md5
- else:
- del sys.modules['_md5']
- self.assertRaises(TypeError, get_builtin_constructor, 3)
-
def test_hexdigest(self):
for name in self.supported_hash_names:
- h = hashlib.new(name)
+ h = hashlib.new(name, usedforsecurity=False)
self.assertTrue(hexstr(h.digest()) == h.hexdigest())
def test_large_update(self):
@@ -153,16 +121,16 @@ def test_large_update(self):
abcs = aas + bees + cees
for name in self.supported_hash_names:
- m1 = hashlib.new(name)
+ m1 = hashlib.new(name, usedforsecurity=False)
m1.update(aas)
m1.update(bees)
m1.update(cees)
- m2 = hashlib.new(name)
+ m2 = hashlib.new(name, usedforsecurity=False)
m2.update(abcs)
self.assertEqual(m1.digest(), m2.digest(), name+' update problem.')
- m3 = hashlib.new(name, abcs)
+ m3 = hashlib.new(name, abcs, usedforsecurity=False)
self.assertEqual(m1.digest(), m3.digest(), name+' new problem.')
def check(self, name, data, digest):
@@ -170,7 +138,7 @@ def check(self, name, data, digest):
# 2 is for hashlib.name(...) and hashlib.new(name, ...)
self.assertGreaterEqual(len(constructors), 2)
for hash_object_constructor in constructors:
- computed = hash_object_constructor(data).hexdigest()
+ computed = hash_object_constructor(data, usedforsecurity=False).hexdigest()
self.assertEqual(
computed, digest,
"Hash algorithm %s constructed using %s returned hexdigest"
@@ -195,7 +163,7 @@ def check_update(self, name, data, digest):
def check_unicode(self, algorithm_name):
# Unicode objects are not allowed as input.
- expected = hashlib.new(algorithm_name, str(u'spam')).hexdigest()
+ expected = hashlib.new(algorithm_name, str(u'spam'), usedforsecurity=False).hexdigest()
self.check(algorithm_name, u'spam', expected)
def test_unicode(self):
@@ -393,6 +361,68 @@ def hash_in_chunks(chunk_size):
self.assertEqual(expected_hash, hasher.hexdigest())
+ def test_issue9146(self):
+ # Ensure that various ways to use "MD5" from "hashlib" don't segfault:
+ m = hashlib.md5(usedforsecurity=False)
+ m.update(b'abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = hashlib.new('md5', usedforsecurity=False)
+ m.update(b'abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = hashlib.md5(b'abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = hashlib.new('md5', b'abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ def assertRaisesDisabledForFIPS(self, callable_obj=None, *args, **kwargs):
+ try:
+ callable_obj(*args, **kwargs)
+ except ValueError, e:
+ if not e.args[0].endswith('disabled for FIPS'):
+ self.fail('Incorrect exception raised')
+ else:
+ self.fail('Exception was not raised')
+
+ @unittest.skipUnless(get_fips_mode(),
+ 'FIPS enforcement required for this test.')
+ def test_hashlib_fips_mode(self):
+ # Ensure that we raise a ValueError on vanilla attempts to use MD5
+ # in hashlib in a FIPS-enforced setting:
+ self.assertRaisesDisabledForFIPS(hashlib.md5)
+ self.assertRaisesDisabledForFIPS(hashlib.new, 'md5')
+
+ @unittest.skipUnless(get_fips_mode(),
+ 'FIPS enforcement required for this test.')
+ def test_hashopenssl_fips_mode(self):
+ # Verify the _hashlib module's handling of md5:
+ import _hashlib
+
+ assert hasattr(_hashlib, 'openssl_md5')
+
+ # Ensure that _hashlib raises a ValueError on vanilla attempts to
+ # use MD5 in a FIPS-enforced setting:
+ self.assertRaisesDisabledForFIPS(_hashlib.openssl_md5)
+ self.assertRaisesDisabledForFIPS(_hashlib.new, 'md5')
+
+ # Ensure that in such a setting we can whitelist a callsite with
+ # usedforsecurity=False and have it succeed:
+ m = _hashlib.openssl_md5(usedforsecurity=False)
+ m.update('abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = _hashlib.new('md5', usedforsecurity=False)
+ m.update('abc\n')
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = _hashlib.openssl_md5('abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
+ m = _hashlib.new('md5', 'abc\n', usedforsecurity=False)
+ self.assertEquals(m.hexdigest(), "0bee89b07a248e27c83fc3d5951213c1")
+
class KDFTests(unittest.TestCase):
pbkdf2_test_vectors = [
From 31e527aa4f57845dfb0c3dd4f0e9192af5a5b4e2 Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Mon, 2 Sep 2019 18:00:47 +0200
Subject: [PATCH 07/11] Don't build non-OpenSSL hash implementations
---
setup.py | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/setup.py b/setup.py
index 33cecc687573..272d2f1b5bb8 100644
--- a/setup.py
+++ b/setup.py
@@ -874,21 +874,6 @@ def detect_modules(self):
print ("warning: openssl 0x%08x is too old for _hashlib" %
openssl_ver)
missing.append('_hashlib')
- if COMPILED_WITH_PYDEBUG or not have_usable_openssl:
- # The _sha module implements the SHA1 hash algorithm.
- exts.append( Extension('_sha', ['shamodule.c']) )
- # The _md5 module implements the RSA Data Security, Inc. MD5
- # Message-Digest Algorithm, described in RFC 1321. The
- # necessary files md5.c and md5.h are included here.
- exts.append( Extension('_md5',
- sources = ['md5module.c', 'md5.c'],
- depends = ['md5.h']) )
-
- min_sha2_openssl_ver = 0x00908000
- if COMPILED_WITH_PYDEBUG or openssl_ver < min_sha2_openssl_ver:
- # OpenSSL doesn't do these until 0.9.8 so we'll bring our own hash
- exts.append( Extension('_sha256', ['sha256module.c']) )
- exts.append( Extension('_sha512', ['sha512module.c']) )
# Modules that provide persistent dictionary-like semantics. You will
# probably want to arrange for at least one of them to be available on
From e9cd6a63ce17a0120b1d017bf08f05f3ed223bb1 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Mon, 2 Sep 2019 18:33:22 +0200
Subject: [PATCH 08/11] Allow for errros in pre-created context creation
---
Modules/_hashopenssl.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 74f9ab9ec150..7609e9e490f0 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -813,7 +813,7 @@ generate_hash_name_list(void)
)) { \
return NULL; \
} \
- if (usedforsecurity == 0) { \
+ if (usedforsecurity == 0 || CONST_new_ ## NAME ## _ctx_p == NULL) { \
ret_obj = EVPnew( \
CONST_ ## NAME ## _name_obj, \
EVP_get_digestbyname(#NAME), \
@@ -846,7 +846,9 @@ generate_hash_name_list(void)
CONST_ ## NAME ## _name_obj = PyString_FromString(#NAME); \
if (EVP_get_digestbyname(#NAME)) { \
CONST_new_ ## NAME ## _ctx_p = EVP_MD_CTX_new(); \
- EVP_DigestInit(CONST_new_ ## NAME ## _ctx_p, EVP_get_digestbyname(#NAME)); \
+ if (!EVP_DigestInit(CONST_new_ ## NAME ## _ctx_p, EVP_get_digestbyname(#NAME))) { \
+ CONST_new_ ## NAME ## _ctx_p = NULL; \
+ } \
} \
} \
} while (0);
From d0465ea1c07f24067b4d6f60f73a29c82f2ad03f Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Mon, 2 Sep 2019 18:40:08 +0200
Subject: [PATCH 09/11] use SHA-256 rather than MD5 in
multiprocessing.connection (patch 169; rhbz#879695)
---
Lib/multiprocessing/connection.py | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index 645a26f069ea..d4dc6ac19d53 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -56,6 +56,10 @@
# 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'
@@ -413,12 +417,16 @@ def PipeClient(address):
WELCOME = b'#WELCOME#'
FAILURE = b'#FAILURE#'
+def get_digestmod_for_hmac():
+ import hashlib
+ return getattr(hashlib, HMAC_DIGEST_NAME)
+
def deliver_challenge(connection, authkey):
import hmac
assert isinstance(authkey, bytes)
message = os.urandom(MESSAGE_LENGTH)
connection.send_bytes(CHALLENGE + message)
- digest = hmac.new(authkey, message).digest()
+ digest = hmac.new(authkey, message, get_digestmod_for_hmac()).digest()
response = connection.recv_bytes(256) # reject large message
if response == digest:
connection.send_bytes(WELCOME)
@@ -432,7 +440,7 @@ 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).digest()
+ digest = hmac.new(authkey, message, get_digestmod_for_hmac()).digest()
connection.send_bytes(digest)
response = connection.recv_bytes(256) # reject large message
if response != WELCOME:
From 82b181a2c55be0f0766fdf1f0a3e950d22fe0602 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <pviktori@redhat.com>
Date: Mon, 19 Aug 2019 13:59:40 +0200
Subject: [PATCH 10/11] Make uuid.uuid3 work (using libuuid via ctypes)
---
Lib/uuid.py | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/Lib/uuid.py b/Lib/uuid.py
index 80d33c0bd83f..bfb7477b5f58 100644
--- a/Lib/uuid.py
+++ b/Lib/uuid.py
@@ -455,6 +455,7 @@ def _netbios_getnode():
# If ctypes is available, use it to find system routines for UUID generation.
_uuid_generate_time = _UuidCreate = None
+_uuid_generate_md5 = None
try:
import ctypes, ctypes.util
import sys
@@ -471,6 +472,8 @@ def _netbios_getnode():
continue
if hasattr(lib, 'uuid_generate_time'):
_uuid_generate_time = lib.uuid_generate_time
+ # The library that has uuid_generate_time should have md5 too.
+ _uuid_generate_md5 = getattr(lib, 'uuid_generate_md5')
break
del _libnames
@@ -595,6 +598,11 @@ def uuid1(node=None, clock_seq=None):
def uuid3(namespace, name):
"""Generate a UUID from the MD5 hash of a namespace UUID and a name."""
+ if _uuid_generate_md5:
+ _buffer = ctypes.create_string_buffer(16)
+ _uuid_generate_md5(_buffer, namespace.bytes, name, len(name))
+ return UUID(bytes=_buffer.raw)
+
from hashlib import md5
hash = md5(namespace.bytes + name).digest()
return UUID(bytes=hash[:16], version=3)
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