[3.7] bpo-38820: OpenSSL 3.0.0 compatibility. (GH-17190)

Doc/library/ssl.rst

@@ -1247,6 +1247,9 @@ SSL sockets also have the following additional methods and attributes:
       The returned dictionary includes additional X509v3 extension items
         such as ``crlDistributionPoints``, ``caIssuers`` and ``OCSP`` URIs.
 
+   .. versionchanged:: 3.7.6
+      IPv6 address strings no longer have a trailing new line.
+
 .. method:: SSLSocket.cipher()
 
    Returns a three-value tuple containing the name of the cipher being used, the

Lib/test/test_ssl.py

@@ -500,7 +500,7 @@ def test_parse_cert_CVE_2013_4238(self):
                    ('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'))
+                   ('IP Address', '2001:DB8:0:0:0:0:0:1'))
         else:
             # OpenSSL 0.9.7 doesn't support IPv6 addresses in subjectAltName
             san = (('DNS', 'altnull.python.org\x00example.com'),
@@ -527,7 +527,7 @@ def test_parse_all_sans(self):
                     (('commonName', 'dirname example'),))),
                 ('URI', 'https://www.python.org/'),
                 ('IP Address', '127.0.0.1'),
-                ('IP Address', '0:0:0:0:0:0:0:1\n'),
+                ('IP Address', '0:0:0:0:0:0:0:1'),
                 ('Registered ID', '1.2.3.4.5')
             )
         )
@@ -554,11 +554,11 @@ def test_openssl_version(self):
         # Some sanity checks follow
         # >= 0.9
         self.assertGreaterEqual(n, 0x900000)
-        # < 3.0
-        self.assertLess(n, 0x30000000)
+        # < 4.0
+        self.assertLess(n, 0x40000000)
         major, minor, fix, patch, status = t
-        self.assertGreaterEqual(major, 0)
-        self.assertLess(major, 3)
+        self.assertGreaterEqual(major, 1)
+        self.assertLess(major, 4)
         self.assertGreaterEqual(minor, 0)
         self.assertLess(minor, 256)
         self.assertGreaterEqual(fix, 0)

Misc/NEWS.d/next/Library/2019-11-16-16-09-07.bpo-38820.ivhUSV.rst

@@ -0,0 +1,2 @@
+Make Python compatible with OpenSSL 3.0.0. :func:`ssl.SSLSocket.getpeercert`
+no longer returns IPv6 addresses with a trailing new line.

Modules/_ssl.c

@@ -1377,14 +1377,61 @@ _get_peer_alt_names (X509 *certificate) {
                 PyTuple_SET_ITEM(t, 1, v);
                 break;
 
+            case GEN_IPADD:
+                /* OpenSSL < 3.0.0 adds a trailing \n to IPv6. 3.0.0 removed
+                 * the trailing newline. Remove it in all versions
+                 */
+                t = PyTuple_New(2);
+                if (t == NULL)
+                    goto fail;
+
+                v = PyUnicode_FromString("IP Address");
+                if (v == NULL) {
+                    Py_DECREF(t);
+                    goto fail;
+                }
+                PyTuple_SET_ITEM(t, 0, v);
+
+                if (name->d.ip->length == 4) {
+                    unsigned char *p = name->d.ip->data;
+                    v = PyUnicode_FromFormat(
+                        "%d.%d.%d.%d",
+                        p[0], p[1], p[2], p[3]
+                    );
+                } else if (name->d.ip->length == 16) {
+                    /* PyUnicode_FromFormat() does not support %X */
+                    unsigned char *p = name->d.ip->data;
+                    len = sprintf(
+                        buf,
+                        "%X:%X:%X:%X:%X:%X:%X:%X",
+                        p[0] << 8 | p[1],
+                        p[2] << 8 | p[3],
+                        p[4] << 8 | p[5],
+                        p[6] << 8 | p[7],
+                        p[8] << 8 | p[9],
+                        p[10] << 8 | p[11],
+                        p[12] << 8 | p[13],
+                        p[14] << 8 | p[15]
+                    );
+                    v = PyUnicode_FromStringAndSize(buf, len);
+                } else {
+                    v = PyUnicode_FromString("<invalid>");
+                }
+
+                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: