Added tls bindings for new OpenSSL APIs (#5595)

fixes #5379
closes #5483

Author: alex

src/_cffi_src/openssl/ssl.py

@@ -24,6 +24,7 @@
 static const long Cryptography_HAS_PSK;
 static const long Cryptography_HAS_VERIFIED_CHAIN;
 static const long Cryptography_HAS_KEYLOG;
+static const long Cryptography_HAS_GET_PROTO_VERSION;
 
 /* Internally invented symbol to tell us if SSL_MODE_RELEASE_BUFFERS is
  * supported
@@ -312,6 +313,16 @@
 long SSL_total_renegotiations(SSL *);
 long SSL_get_secure_renegotiation_support(SSL *);
 
+long SSL_CTX_set_min_proto_version(SSL_CTX *, int);
+long SSL_CTX_set_max_proto_version(SSL_CTX *, int);
+long SSL_set_min_proto_version(SSL *, int);
+long SSL_set_max_proto_version(SSL *, int);
+
+long SSL_CTX_get_min_proto_version(SSL_CTX *);
+long SSL_CTX_get_max_proto_version(SSL_CTX *);
+long SSL_get_min_proto_version(SSL *);
+long SSL_get_max_proto_version(SSL *);
+
 /* Defined as unsigned long because SSL_OP_ALL is greater than signed 32-bit
    and Windows defines long as 32-bit. */
 unsigned long SSL_CTX_set_options(SSL_CTX *, unsigned long);
@@ -330,10 +341,6 @@
 
 /*  methods */
 
-/*
- * TLSv1_1 and TLSv1_2 are recent additions.  Only sufficiently new versions of
- * OpenSSL support them.
- */
 const SSL_METHOD *TLSv1_1_method(void);
 const SSL_METHOD *TLSv1_1_server_method(void);
 const SSL_METHOD *TLSv1_1_client_method(void);
@@ -363,6 +370,10 @@
 const SSL_METHOD *SSLv23_server_method(void);
 const SSL_METHOD *SSLv23_client_method(void);
 
+const SSL_METHOD *TLS_method(void);
+const SSL_METHOD *TLS_server_method(void);
+const SSL_METHOD *TLS_client_method(void);
+
 /*- These aren't macros these arguments are all const X on openssl > 1.0.x -*/
 SSL_CTX *SSL_CTX_new(SSL_METHOD *);
 long SSL_CTX_get_timeout(const SSL_CTX *);
@@ -674,4 +685,15 @@
 #else
 static const long Cryptography_HAS_TLSv1_3 = 1;
 #endif
+
+#if CRYPTOGRAPHY_OPENSSL_LESS_THAN_111 && !CRYPTOGRAPHY_IS_LIBRESSL
+static const long Cryptography_HAS_GET_PROTO_VERSION = 0;
+
+long (*SSL_CTX_get_min_proto_version)(SSL_CTX *) = NULL;
+long (*SSL_CTX_get_max_proto_version)(SSL_CTX *) = NULL;
+long (*SSL_get_min_proto_version)(SSL *) = NULL;
+long (*SSL_get_max_proto_version)(SSL *) = NULL;
+#else
+static const long Cryptography_HAS_GET_PROTO_VERSION = 1;
+#endif
 """

src/cryptography/hazmat/bindings/openssl/_conditional.py

@@ -262,6 +262,15 @@ def cryptography_has_srtp():
     ]
 
 
+def cryptography_has_get_proto_version():
+    return [
+        "SSL_CTX_get_min_proto_version",
+        "SSL_CTX_get_max_proto_version",
+        "SSL_get_min_proto_version",
+        "SSL_get_max_proto_version",
+    ]
+
+
 # This is a mapping of
 # {condition: function-returning-names-dependent-on-that-condition} so we can
 # loop over them and delete unsupported names at runtime. It will be removed
@@ -309,4 +318,5 @@ def cryptography_has_srtp():
     "Cryptography_HAS_ENGINE": cryptography_has_engine,
     "Cryptography_HAS_VERIFIED_CHAIN": cryptography_has_verified_chain,
     "Cryptography_HAS_SRTP": cryptography_has_srtp,
+    "Cryptography_HAS_GET_PROTO_VERSION": cryptography_has_get_proto_version,
 }