To enable secure connections, the proper options must be used to specify the appropriate certificate and key files. For a complete list of options related to establishment of secure connections, see Section 7.4.5, “Command Options for Secure Connections”.
If you need to create the required certificate and key files, see Section 7.4.6, “Creating SSL and RSA Certificates and Keys”.
To start the MySQL server so that it permits clients to connect securely, use options that identify the certificate and key files the server uses when establishing a secure connection:
For example, start the server with these lines in the
my.cnf file, changing the file names as
[mysqld] ssl-ca=ca.pem ssl-cert=server-cert.pem ssl-key=server-key.pem
Each option names a file in PEM format. If you have a MySQL source
distribution, you can test your setup using the demonstration
certificate and key files in its
As of MySQL 5.7.5, the server-side
--ssl option value is enabled by
default. Also as of MySQL 5.7.5, MySQL servers compiled using
OpenSSL can generate missing certificate and key files
automatically at startup. See
Section 220.127.116.11, “Creating SSL and RSA Certificates and Keys using MySQL”.
The server performs certificate and key file autodiscovery as of
MySQL 5.7.5 (for servers compiled using OpenSSL) or 5.7.6 (for
servers compiled using yaSSL). If
--ssl is enabled (possibly along
--ssl-cipher) and other
--ssl- options are
not given to configure secure connections explicitly, the server
attempts to enable support for secure connections automatically at
If the server discovers valid certificate and key files named
server-key.pemin the data directory, it enables support for secure connections by clients. (The files need not have been autogenerated; what matters is that they have the indicated names and are valid.)
If the server does not find valid certificate and key files in the data directory, it continues executing but does not enable secure connections.
If the server automatically enables support for secure connections, it writes a message to the error log. As of MySQL 5.7.6, if the server discovers that the CA certificate is self-signed, it writes a warning to the error log. (The certificate will be self-signed if created automatically by the server or manually using mysql_ssl_rsa_setup.)
For further control over whether clients must connect securely,
system variable; see Section 6.1.5, “Server System Variables”.
For information about permitted encryption protocols and ciphers,
see Section 7.4.3, “Secure Connection Protocols and Ciphers”.
To connect securely to a MySQL server that supports secure
connections, the options that a client must specify depend on the
encryption requirements of the MySQL account used by the client.
(See the discussion of the
REQUIRE clause in
Section 18.104.22.168, “CREATE USER Syntax”.)
Suppose that you want to connect using an account that has no
special encryption requirements or was created using a
CREATE USER statement that includes
REQUIRE SSL option. As a recommended set of
secure-connection options, start the server with at least
--ssl-key, and invoke the client
--ssl-ca. A client can
connect securely like this:
To require that a client certificate also be specified, create the
account using the
REQUIRE X509 option. Then the
client must also specify the proper client key and certificate
files or the server will reject the connection:
mysql --ssl-ca=ca.pem \
As of MySQL 5.7.7, client programs attempt to establish a secure connection by default whenever the server supports secure connections:
Before MySQL 5.7.3,
--ssl on the
client side is advisory:
permits but does not require the client to connect to the server
using encryption. Therefore, this option is not sufficient in
itself to cause a secure connection to be used. For example, if
you specify this option for a client program but the server has
not been configured to support secure connections, the client
falls back to an unencrypted connection.
For information about permitted encryption protocols and ciphers, see Section 7.4.3, “Secure Connection Protocols and Ciphers”.
A client can determine whether the current connection with the
server uses encryption by checking the value of the
Ssl_cipher status variable. If
the value is empty, the connection is not encrypted. Otherwise,
the connection is encrypted and the value indicates the encryption
cipher. For example:
SHOW STATUS LIKE 'Ssl_cipher';+---------------+--------------------+ | Variable_name | Value | +---------------+--------------------+ | Ssl_cipher | DHE-RSA-AES256-SHA | +---------------+--------------------+
For the mysql client, an alternative is to use
\s command and
\s... SSL: Cipher in use is DHE-RSA-AES256-SHA ...
\s... SSL: Not in use ...
The C API enables application programs to use secure connections:
To establish a secure connection, use the
mysql_ssl_set()C API function to set the appropriate certificate options before calling
mysql_real_connect(). See Section 22.214.171.124, “mysql_ssl_set()”. To require the use of a secure connection, call
MYSQL_OPT_SSL_MODEoption (use the
MYSQL_OPT_SSL_ENFORCEoption before MySQL 5.7.11). To establish permitted encryption protocols, call
To determine whether encryption is in use after the connection is established, use
mysql_get_ssl_cipher(). A non-
NULLreturn value indicates an encrypted connection and names the cipher used for encryption. A
NULLreturn value indicates that encryption is not being used. See Section 126.96.36.199, “mysql_get_ssl_cipher()”.
Replication uses the C API, so secure connections can be used between master and slave servers. See Section 18.3.8, “Setting Up Replication to Use Secure Connections”.