2.8.6 Configuring SSL Library Support

An SSL library is required for support of encrypted connections, entropy for random number generation, and other encryption-related operations. Your system must support either OpenSSL or yaSSL:

• All MySQL Enterprise Edition binary distributions are compiled using OpenSSL. It is not possible to use yaSSL with MySQL Enterprise Edition.

• Prior to MySQL 5.7.28, MySQL Community Edition binary distributions are compiled using yaSSL. As of MySQL 5.7.28, support for yaSSL is removed and all MySQL builds use OpenSSL.

• Prior to MySQL 5.7.28, MySQL Community Edition source distributions can be compiled using either OpenSSL or yaSSL. As of MySQL 5.7.28, support for yaSSL is removed.

If you compile MySQL from a source distribution, CMake configures the distribution to use the installed OpenSSL library by default.

To compile using OpenSSL, use this procedure:

1. Ensure that OpenSSL 1.0.1 or newer is installed on your system. If the installed OpenSSL version is older than 1.0.1, CMake produces an error at MySQL configuration time. If it is necessary to obtain OpenSSL, visit http://www.openssl.org.

2. The WITH_SSL CMake option determines which SSL library to use for compiling MySQL (see Section 2.8.7, “MySQL Source-Configuration Options”). The default is -DWITH_SSL=system, which uses OpenSSL. To make this explicit, specify that option. For example:

   cmake . -DWITH_SSL=system

   That command configures the distribution to use the installed OpenSSL library. Alternatively, to explicitly specify the path name to the OpenSSL installation, use the following syntax. This can be useful if you have multiple versions of OpenSSL installed, to prevent CMake from choosing the wrong one:

   cmake . -DWITH_SSL=path_name

3. Compile and install the distribution.

To check whether a mysqld server supports encrypted connections, examine the value of the have_ssl system variable:

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

If the value is YES, the server supports encrypted connections. If the value is DISABLED, the server is capable of supporting encrypted connections but was not started with the appropriate --ssl-xxx options to enable encrypted connections to be used; see Section 6.3.1, “Configuring MySQL to Use Encrypted Connections”.

To determine whether a server was compiled using OpenSSL or yaSSL, check the existence of any of the system or status variables that are present only for OpenSSL. See Section 6.3.4, “SSL Library-Dependent Capabilities”.