6.3.6.2 Configuring MySQL for SSL

To use SSL connections between the MySQL server and client programs, your system must support either OpenSSL or yaSSL, and your version of MySQL must be built with SSL support. To make it easier to use secure connections, as of version 5.0.10, MySQL is bundled with yaSSL, which uses the same licensing model as MySQL. (OpenSSL uses an Apache-style license.) yaSSL support is available on all platforms supported by Oracle Corporation.

To get secure connections to work with MySQL and SSL, you must do the following:

  1. If you are not using a binary (precompiled) version of MySQL that has been built with SSL support, and you are going to use OpenSSL rather than the bundled yaSSL library, install OpenSSL if it has not already been installed. We have tested MySQL with OpenSSL 0.9.6. To obtain OpenSSL, visit http://www.openssl.org.

    Building MySQL using OpenSSL requires a shared OpenSSL library, otherwise linker errors occur. Alternatively, build MySQL using yaSSL.

  2. If you are not using a binary (precompiled) version of MySQL that has been built with SSL support, configure a MySQL source distribution to use SSL. When you configure MySQL, invoke the configure script with the appropriate option to select the SSL library that you want to use.

    For yaSSL:

    shell> ./configure --with-yassl
    

    For OpenSSL:

    shell> ./configure --with-openssl
    

    Before MySQL 5.0, it was also neccessary to use --with-vio, but that option is no longer required.

    Then compile and install the distribution.

    On Unix platforms, yaSSL retrieves true random numbers from either /dev/urandom or /dev/random. Bug#13164 lists workarounds for some very old platforms which do not support these devices.

  3. To check whether a server binary is compiled with SSL support, invoke it with the --ssl option. An error will occur if the server does not support SSL:

    shell> mysqld --ssl --help
    060525 14:18:52 [ERROR] mysqld: unknown option '--ssl'
    

    To check whether a running mysqld server supports SSL, examine the value of the have_ssl system variable (if you have no have_ssl variable, check for have_openssl):

    mysql> SHOW VARIABLES LIKE 'have_ssl';
    +---------------+-------+
    | Variable_name | Value |
    +---------------+-------+
    | have_ssl      | YES   |
    +---------------+-------+
    

    If the value is YES, the server supports SSL connections. If the value is DISABLED, the server is capable of supporting SSL connections but was not started with the appropriate --ssl-xxx options to enable them to be used; see Section 6.3.6.3, “Using SSL Connections”.