Add Session functions, necessary to implement new features in Python …

…3.6. (#4205)

src/_cffi_src/openssl/ssl.py

@@ -306,6 +306,10 @@
 
 SSL_SESSION *SSL_get_session(const SSL *);
 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *, unsigned int *);
+long SSL_SESSION_get_time(const SSL_SESSION *);
+long SSL_SESSION_get_timeout(const SSL_SESSION *);
+int SSL_SESSION_has_ticket(const SSL_SESSION *);
+long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *);
 
 /* not a macro, but older OpenSSLs don't pass the args as const */
 char *SSL_CIPHER_description(const SSL_CIPHER *, char *, int);
@@ -570,6 +574,16 @@
     memcpy(out, session->master_key, outlen);
     return outlen;
 }
+/* from ssl/ssl_sess.c */
+int SSL_SESSION_has_ticket(const SSL_SESSION *s)
+{
+    return (s->tlsext_ticklen > 0) ? 1 : 0;
+}
+/* from ssl/ssl_sess.c */
+unsigned long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
+{
+    return s->tlsext_tick_lifetime_hint;
+}
 #endif
 
 static const long Cryptography_HAS_SECURE_RENEGOTIATION = 1;