bpo-30008: Fix OpenSSL no-deprecated compilation (GH-20397)

Fix :mod:`ssl`` code to be compatible with OpenSSL 1.1.x builds that use
``no-deprecated`` and ``--api=1.1.0``.

Note: Tests assume full OpenSSL API and fail with limited API.

Signed-off-by: Christian Heimes <christian@python.org>
Co-authored-by: Mark Wright <gienah@gentoo.org>

Misc/NEWS.d/next/Library/2020-05-25-22-18-38.bpo-30008.CKC3td.rst

@@ -0,0 +1,2 @@
+Fix :mod:`ssl` code to be compatible with OpenSSL 1.1.x builds that use
+``no-deprecated`` and ``--api=1.1.0``.

Modules/_ssl.c

@@ -142,6 +142,24 @@ static void _PySSLFixErrno(void) {
 #  define PY_OPENSSL_1_1_API 1
 #endif
 
+/* OpenSSL API compat */
+#ifdef OPENSSL_API_COMPAT
+#if OPENSSL_API_COMPAT >= 0x10100000L
+
+/* OpenSSL API 1.1.0+ does not include version methods */
+#ifndef OPENSSL_NO_TLS1_METHOD
+#define OPENSSL_NO_TLS1_METHOD 1
+#endif
+#ifndef OPENSSL_NO_TLS1_1_METHOD
+#define OPENSSL_NO_TLS1_1_METHOD 1
+#endif
+#ifndef OPENSSL_NO_TLS1_2_METHOD
+#define OPENSSL_NO_TLS1_2_METHOD 1
+#endif
+
+#endif /* >= 1.1.0 compcat */
+#endif /* OPENSSL_API_COMPAT */
+
 /* LibreSSL 2.7.0 provides necessary OpenSSL 1.1.0 APIs */
 #if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER >= 0x2070000fL
 #  define PY_OPENSSL_1_1_API 1
@@ -201,6 +219,12 @@ static void _PySSLFixErrno(void) {
 #define TLS_method SSLv23_method
 #define TLS_client_method SSLv23_client_method
 #define TLS_server_method SSLv23_server_method
+#define ASN1_STRING_get0_data ASN1_STRING_data
+#define X509_get0_notBefore X509_get_notBefore
+#define X509_get0_notAfter X509_get_notAfter
+#define OpenSSL_version_num SSLeay
+#define OpenSSL_version SSLeay_version
+#define OPENSSL_VERSION SSLEAY_VERSION
 
 static int X509_NAME_ENTRY_set(const X509_NAME_ENTRY *ne)
 {
@@ -885,7 +909,7 @@ _ssl_configure_hostname(PySSLSocket *self, const char* server_hostname)
                 goto error;
             }
         } else {
-            if (!X509_VERIFY_PARAM_set1_ip(param, ASN1_STRING_data(ip),
+            if (!X509_VERIFY_PARAM_set1_ip(param, ASN1_STRING_get0_data(ip),
                                            ASN1_STRING_length(ip))) {
                 _setSSLError(NULL, 0, __FILE__, __LINE__);
                 goto error;
@@ -1361,7 +1385,7 @@ _get_peer_alt_names (X509 *certificate) {
                     goto fail;
                 }
                 PyTuple_SET_ITEM(t, 0, v);
-                v = PyUnicode_FromStringAndSize((char *)ASN1_STRING_data(as),
+                v = PyUnicode_FromStringAndSize((char *)ASN1_STRING_get0_data(as),
                                                 ASN1_STRING_length(as));
                 if (v == NULL) {
                     Py_DECREF(t);
@@ -1657,7 +1681,7 @@ _decode_certificate(X509 *certificate) {
     ASN1_INTEGER *serialNumber;
     char buf[2048];
     int len, result;
-    ASN1_TIME *notBefore, *notAfter;
+    const ASN1_TIME *notBefore, *notAfter;
     PyObject *pnotBefore, *pnotAfter;
 
     retval = PyDict_New();
@@ -1719,7 +1743,7 @@ _decode_certificate(X509 *certificate) {
     Py_DECREF(sn_obj);
 
     (void) BIO_reset(biobuf);
-    notBefore = X509_get_notBefore(certificate);
+    notBefore = X509_get0_notBefore(certificate);
     ASN1_TIME_print(biobuf, notBefore);
     len = BIO_gets(biobuf, buf, sizeof(buf)-1);
     if (len < 0) {
@@ -1736,7 +1760,7 @@ _decode_certificate(X509 *certificate) {
     Py_DECREF(pnotBefore);
 
     (void) BIO_reset(biobuf);
-    notAfter = X509_get_notAfter(certificate);
+    notAfter = X509_get0_notAfter(certificate);
     ASN1_TIME_print(biobuf, notAfter);
     len = BIO_gets(biobuf, buf, sizeof(buf)-1);
     if (len < 0) {
@@ -3079,17 +3103,23 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
         ctx = SSL_CTX_new(SSLv3_method());
         break;
 #endif
-#if defined(TLS1_VERSION) && !defined(OPENSSL_NO_TLS1)
+#if (defined(TLS1_VERSION) && \
+        !defined(OPENSSL_NO_TLS1) && \
+        !defined(OPENSSL_NO_TLS1_METHOD))
     case PY_SSL_VERSION_TLS1:
         ctx = SSL_CTX_new(TLSv1_method());
         break;
 #endif
-#if defined(TLS1_1_VERSION) && !defined(OPENSSL_NO_TLS1_1)
+#if (defined(TLS1_1_VERSION) && \
+        !defined(OPENSSL_NO_TLS1_1) && \
+        !defined(OPENSSL_NO_TLS1_1_METHOD))
     case PY_SSL_VERSION_TLS1_1:
         ctx = SSL_CTX_new(TLSv1_1_method());
         break;
 #endif
-#if defined(TLS1_2_VERSION) && !defined(OPENSSL_NO_TLS1_2)
+#if (defined(TLS1_2_VERSION) && \
+        !defined(OPENSSL_NO_TLS1_2) && \
+        !defined(OPENSSL_NO_TLS1_2_METHOD))
     case PY_SSL_VERSION_TLS1_2:
         ctx = SSL_CTX_new(TLSv1_2_method());
         break;
@@ -3207,7 +3237,7 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
        conservative and assume it wasn't fixed until release. We do this check
        at runtime to avoid problems from the dynamic linker.
        See #25672 for more on this. */
-    libver = SSLeay();
+    libver = OpenSSL_version_num();
     if (!(libver >= 0x10001000UL && libver < 0x1000108fUL) &&
         !(libver >= 0x10000000UL && libver < 0x100000dfUL)) {
         SSL_CTX_set_mode(self->ctx, SSL_MODE_RELEASE_BUFFERS);
@@ -5286,7 +5316,11 @@ PySSL_RAND(int len, int pseudo)
     if (bytes == NULL)
         return NULL;
     if (pseudo) {
+#ifdef PY_OPENSSL_1_1_API
+        ok = RAND_bytes((unsigned char*)PyBytes_AS_STRING(bytes), len);
+#else
         ok = RAND_pseudo_bytes((unsigned char*)PyBytes_AS_STRING(bytes), len);
+#endif
         if (ok == 0 || ok == 1)
             return Py_BuildValue("NO", bytes, ok == 1 ? Py_True : Py_False);
     }
@@ -6373,7 +6407,7 @@ PyInit__ssl(void)
     /* SSLeay() gives us the version of the library linked against,
        which could be different from the headers version.
     */
-    libver = SSLeay();
+    libver = OpenSSL_version_num();
     r = PyLong_FromUnsignedLong(libver);
     if (r == NULL)
         return NULL;
@@ -6383,7 +6417,7 @@ PyInit__ssl(void)
     r = Py_BuildValue("IIIII", major, minor, fix, patch, status);
     if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION_INFO", r))
         return NULL;
-    r = PyUnicode_FromString(SSLeay_version(SSLEAY_VERSION));
+    r = PyUnicode_FromString(OpenSSL_version(OPENSSL_VERSION));
     if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION", r))
         return NULL;
 

Tools/ssl/multissltests.py

@@ -314,6 +314,7 @@ class AbstractBuilder(object):
             "shared", "--debug",
             "--prefix={}".format(self.install_dir)
         ]
+        # cmd.extend(["no-deprecated", "--api=1.1.0"])
         env = os.environ.copy()
         # set rpath
         env["LD_RUN_PATH"] = self.lib_dir