Bug#25309 SSL connections without CA certificate broken since MySQL 5.0.23

 - Turn off verification of peer if both ca_path and ca_file is null
   i.e from only passing --ssl-key=<client_key> and --ssl-cert=<client_cert>
   to the mysql utility programs.
   The server will authenticate the client accoring to GRANT tables
   but the client won't authenticate the server 

mysql-test/r/openssl_1.result

@@ -51,3 +51,5 @@ SSL error: Unable to get private key from ''
 mysqltest: Could not open connection 'default': 2026 SSL connection error
 SSL error: Unable to get certificate from ''
 mysqltest: Could not open connection 'default': 2026 SSL connection error
+Variable_name	Value
+Ssl_cipher	DHE-RSA-AES256-SHA

mysql-test/t/openssl_1.test

@@ -95,4 +95,11 @@ drop table t1;
 --error 1
 --exec $MYSQL_TEST --ssl-cert= --max-connect-retries=1 < $MYSQLTEST_VARDIR/tmp/test.sql 2>&1
 
-
+#
+# Bug#25309 SSL connections without CA certificate broken since MySQL 5.0.23
+#
+# Test that we can open encrypted connection to server without
+# verification of servers certificate by setting both ca certificate
+# and ca path to NULL
+#
+--exec $MYSQL --ssl --ssl-key=$MYSQL_TEST_DIR/std_data/client-key.pem --ssl-cert=$MYSQL_TEST_DIR/std_data/client-cert.pem -e "SHOW STATUS LIKE 'ssl_Cipher'" 2>&1

vio/viosslfactories.c

@@ -301,6 +301,14 @@ new_VioSSLConnectorFd(const char *key_file, const char *cert_file,
 {
   struct st_VioSSLFd *ssl_fd;
   int verify= SSL_VERIFY_PEER;
+
+  /*
+    Turn off verification of servers certificate if both
+    ca_file and ca_path is set to NULL
+  */
+  if (ca_file == 0 && ca_path == 0)
+    verify= SSL_VERIFY_NONE;
+
   if (!(ssl_fd= new_VioSSLFd(key_file, cert_file, ca_file,
                              ca_path, cipher, TLSv1_client_method())))
   {