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|
# HG changeset patch
# User Christian Heimes <christian@cheimes.de>
# Date 1376693687 -7200
# Node ID bd2360476bdbb1477b81b0e18b8d86b3452ba77b
# Parent 87fcc13ade91874971ad577efaa2254c744a2b07
Issue #18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes
inside subjectAltName correctly. Formerly the module has used OpenSSL's
GENERAL_NAME_print() function to get the string represention of ASN.1
strings for rfc822Name (email), dNSName (DNS) and
uniformResourceIdentifier (URI).
diff --git a/Lib/test/nullbytecert.pem b/Lib/test/nullbytecert.pem
new file mode 100644
--- /dev/null
+++ b/Lib/test/nullbytecert.pem
@@ -0,0 +1,90 @@
+Certificate:
+ Data:
+ Version: 3 (0x2)
+ Serial Number: 0 (0x0)
+ Signature Algorithm: sha1WithRSAEncryption
+ Issuer: C=US, ST=Oregon, L=Beaverton, O=Python Software Foundation, OU=Python Core Development, CN=null.python.org\x00example.org/emailAddress=python-dev@python.org
+ Validity
+ Not Before: Aug 7 13:11:52 2013 GMT
+ Not After : Aug 7 13:12:52 2013 GMT
+ Subject: C=US, ST=Oregon, L=Beaverton, O=Python Software Foundation, OU=Python Core Development, CN=null.python.org\x00example.org/emailAddress=python-dev@python.org
+ Subject Public Key Info:
+ Public Key Algorithm: rsaEncryption
+ Public-Key: (2048 bit)
+ Modulus:
+ 00:b5:ea:ed:c9:fb:46:7d:6f:3b:76:80:dd:3a:f3:
+ 03:94:0b:a7:a6:db:ec:1d:df:ff:23:74:08:9d:97:
+ 16:3f:a3:a4:7b:3e:1b:0e:96:59:25:03:a7:26:e2:
+ 88:a9:cf:79:cd:f7:04:56:b0:ab:79:32:6e:59:c1:
+ 32:30:54:eb:58:a8:cb:91:f0:42:a5:64:27:cb:d4:
+ 56:31:88:52:ad:cf:bd:7f:f0:06:64:1f:cc:27:b8:
+ a3:8b:8c:f3:d8:29:1f:25:0b:f5:46:06:1b:ca:02:
+ 45:ad:7b:76:0a:9c:bf:bb:b9:ae:0d:16:ab:60:75:
+ ae:06:3e:9c:7c:31:dc:92:2f:29:1a:e0:4b:0c:91:
+ 90:6c:e9:37:c5:90:d7:2a:d7:97:15:a3:80:8f:5d:
+ 7b:49:8f:54:30:d4:97:2c:1c:5b:37:b5:ab:69:30:
+ 68:43:d3:33:78:4b:02:60:f5:3c:44:80:a1:8f:e7:
+ f0:0f:d1:5e:87:9e:46:cf:62:fc:f9:bf:0c:65:12:
+ f1:93:c8:35:79:3f:c8:ec:ec:47:f5:ef:be:44:d5:
+ ae:82:1e:2d:9a:9f:98:5a:67:65:e1:74:70:7c:cb:
+ d3:c2:ce:0e:45:49:27:dc:e3:2d:d4:fb:48:0e:2f:
+ 9e:77:b8:14:46:c0:c4:36:ca:02:ae:6a:91:8c:da:
+ 2f:85
+ Exponent: 65537 (0x10001)
+ X509v3 extensions:
+ X509v3 Basic Constraints: critical
+ CA:FALSE
+ X509v3 Subject Key Identifier:
+ 88:5A:55:C0:52:FF:61:CD:52:A3:35:0F:EA:5A:9C:24:38:22:F7:5C
+ X509v3 Key Usage:
+ Digital Signature, Non Repudiation, Key Encipherment
+ X509v3 Subject Alternative Name:
+ *************************************************************
+ WARNING: The values for DNS, email and URI are WRONG. OpenSSL
+ doesn't print the text after a NULL byte.
+ *************************************************************
+ DNS:altnull.python.org, email:null@python.org, URI:http://null.python.org, IP Address:192.0.2.1, IP Address:2001:DB8:0:0:0:0:0:1
+ Signature Algorithm: sha1WithRSAEncryption
+ ac:4f:45:ef:7d:49:a8:21:70:8e:88:59:3e:d4:36:42:70:f5:
+ a3:bd:8b:d7:a8:d0:58:f6:31:4a:b1:a4:a6:dd:6f:d9:e8:44:
+ 3c:b6:0a:71:d6:7f:b1:08:61:9d:60:ce:75:cf:77:0c:d2:37:
+ 86:02:8d:5e:5d:f9:0f:71:b4:16:a8:c1:3d:23:1c:f1:11:b3:
+ 56:6e:ca:d0:8d:34:94:e6:87:2a:99:f2:ae:ae:cc:c2:e8:86:
+ de:08:a8:7f:c5:05:fa:6f:81:a7:82:e6:d0:53:9d:34:f4:ac:
+ 3e:40:fe:89:57:7a:29:a4:91:7e:0b:c6:51:31:e5:10:2f:a4:
+ 60:76:cd:95:51:1a:be:8b:a1:b0:fd:ad:52:bd:d7:1b:87:60:
+ d2:31:c7:17:c4:18:4f:2d:08:25:a3:a7:4f:b7:92:ca:e2:f5:
+ 25:f1:54:75:81:9d:b3:3d:61:a2:f7:da:ed:e1:c6:6f:2c:60:
+ 1f:d8:6f:c5:92:05:ab:c9:09:62:49:a9:14:ad:55:11:cc:d6:
+ 4a:19:94:99:97:37:1d:81:5f:8b:cf:a3:a8:96:44:51:08:3d:
+ 0b:05:65:12:eb:b6:70:80:88:48:72:4f:c6:c2:da:cf:cd:8e:
+ 5b:ba:97:2f:60:b4:96:56:49:5e:3a:43:76:63:04:be:2a:f6:
+ c1:ca:a9:94
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -25,6 +25,7 @@ ssl = test_support.import_module("ssl")
HOST = test_support.HOST
CERTFILE = None
SVN_PYTHON_ORG_ROOT_CERT = None
+NULLBYTECERT = None
def handle_error(prefix):
exc_format = ' '.join(traceback.format_exception(*sys.exc_info()))
@@ -123,6 +124,27 @@ class BasicSocketTests(unittest.TestCase
('DNS', 'projects.forum.nokia.com'))
)
+ def test_parse_cert_CVE_2013_4238(self):
+ p = ssl._ssl._test_decode_cert(NULLBYTECERT)
+ if test_support.verbose:
+ sys.stdout.write("\n" + pprint.pformat(p) + "\n")
+ subject = ((('countryName', 'US'),),
+ (('stateOrProvinceName', 'Oregon'),),
+ (('localityName', 'Beaverton'),),
+ (('organizationName', 'Python Software Foundation'),),
+ (('organizationalUnitName', 'Python Core Development'),),
+ (('commonName', 'null.python.org\x00example.org'),),
+ (('emailAddress', 'python-dev@python.org'),))
+ self.assertEqual(p['subject'], subject)
+ self.assertEqual(p['issuer'], subject)
+ self.assertEqual(p['subjectAltName'],
+ (('DNS', 'altnull.python.org\x00example.com'),
+ ('email', 'null@python.org\x00user@example.org'),
+ ('URI', 'http://null.python.org\x00http://example.org'),
+ ('IP Address', '192.0.2.1'),
+ ('IP Address', '2001:DB8:0:0:0:0:0:1\n'))
+ )
+
def test_DER_to_PEM(self):
with open(SVN_PYTHON_ORG_ROOT_CERT, 'r') as f:
pem = f.read()
@@ -1360,7 +1382,7 @@ else:
def test_main(verbose=False):
- global CERTFILE, SVN_PYTHON_ORG_ROOT_CERT, NOKIACERT
+ global CERTFILE, SVN_PYTHON_ORG_ROOT_CERT, NOKIACERT, NULLBYTECERT
CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir,
"keycert.pem")
SVN_PYTHON_ORG_ROOT_CERT = os.path.join(
@@ -1368,10 +1390,13 @@ def test_main(verbose=False):
"https_svn_python_org_root.pem")
NOKIACERT = os.path.join(os.path.dirname(__file__) or os.curdir,
"nokia.pem")
+ NULLBYTECERT = os.path.join(os.path.dirname(__file__) or os.curdir,
+ "nullbytecert.pem")
if (not os.path.exists(CERTFILE) or
not os.path.exists(SVN_PYTHON_ORG_ROOT_CERT) or
- not os.path.exists(NOKIACERT)):
+ not os.path.exists(NOKIACERT) or
+ not os.path.exists(NULLBYTECERT)):
raise test_support.TestFailed("Can't read certificate files!")
tests = [BasicTests, BasicSocketTests]
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -738,13 +738,16 @@ static PyObject *
ext->value->length));
for(j = 0; j < sk_GENERAL_NAME_num(names); j++) {
-
/* get a rendering of each name in the set of names */
+ int gntype;
+ ASN1_STRING *as = NULL;
name = sk_GENERAL_NAME_value(names, j);
- if (name->type == GEN_DIRNAME) {
-
- /* we special-case DirName as a tuple of tuples of attributes */
+ gntype = name-> type;
+ switch (gntype) {
+ case GEN_DIRNAME:
+ /* we special-case DirName as a tuple of
+ tuples of attributes */
t = PyTuple_New(2);
if (t == NULL) {
@@ -764,11 +767,61 @@ static PyObject *
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
+ break;
- } else {
+ case GEN_EMAIL:
+ case GEN_DNS:
+ case GEN_URI:
+ /* GENERAL_NAME_print() doesn't handle NULL bytes in ASN1_string
+ correctly, CVE-2013-4238 */
+ t = PyTuple_New(2);
+ if (t == NULL)
+ goto fail;
+ switch (gntype) {
+ case GEN_EMAIL:
+ v = PyString_FromString("email");
+ as = name->d.rfc822Name;
+ break;
+ case GEN_DNS:
+ v = PyString_FromString("DNS");
+ as = name->d.dNSName;
+ break;
+ case GEN_URI:
+ v = PyString_FromString("URI");
+ as = name->d.uniformResourceIdentifier;
+ break;
+ }
+ if (v == NULL) {
+ Py_DECREF(t);
+ goto fail;
+ }
+ PyTuple_SET_ITEM(t, 0, v);
+ v = PyString_FromStringAndSize((char *)ASN1_STRING_data(as),
+ ASN1_STRING_length(as));
+ if (v == NULL) {
+ Py_DECREF(t);
+ goto fail;
+ }
+ PyTuple_SET_ITEM(t, 1, v);
+ break;
+ default:
/* for everything else, we use the OpenSSL print form */
-
+ switch (gntype) {
+ /* check for new general name type */
+ case GEN_OTHERNAME:
+ case GEN_X400:
+ case GEN_EDIPARTY:
+ case GEN_IPADD:
+ case GEN_RID:
+ break;
+ default:
+ if (PyErr_Warn(PyExc_RuntimeWarning,
+ "Unknown general name type") == -1) {
+ goto fail;
+ }
+ break;
+ }
(void) BIO_reset(biobuf);
GENERAL_NAME_print(biobuf, name);
len = BIO_gets(biobuf, buf, sizeof(buf)-1);
@@ -794,6 +847,7 @@ static PyObject *
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
+ break;
}
/* and add that rendering to the list */
|
