6.4.11 Using the Oracle Cloud Infrastructure Vault Keyring Component

Note

The Oracle Cloud Infrastructure Vault keyring component is included in MySQL Enterprise Edition, a commercial product. To learn more about commercial products, see https://www.mysql.com/products/.

component_keyring_oci is part of the component infrastructure that communicates with Oracle Cloud Infrastructure Vault for back end storage. No key information is permanently stored in MySQL server local storage. All keys are stored in Oracle Cloud Infrastructure Vault, making this component well suited for Oracle Cloud Infrastructure MySQL customers for management of their MySQL Enterprise Edition keys.

In MySQL 8.0.24, MySQL Keyring began transitioning from plugins to use the component infrastructure. The introduction of component_keyring_oci in MySQL 8.0.31 is a continuation of that effort. For more information, see Keyring Components Versus Keyring Plugins.

Note

Only one keyring component or plugin should be enabled at a time. Enabling multiple keyring components or plugins is unsupported and results may not be as anticipated.

To use component_keyring_oci for keystore management, you must:

1. Write a manifest that tells the server to load component_keyring_oci, as described in Section 6.4.2, “Keyring Component Installation”.

2. Write a configuration file for component_keyring_oci, as described here.

After writing a manifest and configuration file, you should be able to access keys that were created using the keyring_oci plugin, provided that you specify the same set of configuration options to initialize the keyring component. The built-in backward compatibility of component_keyring_oci simplifies migrating from the keyring plugin to the component.

• Configuration Notes

• Verify the Component Installation

• Vault Keyring Component Usage

Configuration Notes

When it initializes, component_keyring_oci reads either a global configuration file, or a global configuration file paired with a local configuration file:

• The component attempts to read its global configuration file from the directory where the component library file is installed (that is, the server plugin directory).

• If the global configuration file indicates use of a local configuration file, the component attempts to read its local configuration file from the data directory.

• Although global and local configuration files are located in different directories, the file name is component_keyring_oci.cnf in both locations.

• It is an error for no configuration file to exist. component_keyring_oci cannot initialize without a valid configuration.

Local configuration files permit setting up multiple server instances to use component_keyring_oci, such that component configuration for each server instance is specific to a given data directory instance. This enables the same keyring component to be used with a distinct Oracle Cloud Infrastructure Vault for each instance.

You are assumed to be familiar with Oracle Cloud Infrastructure concepts, but the following documentation may be helpful when setting up resources to be used by component_keyring_oci:

• Overview of Vault

• Required Keys and OCIDs

• Managing Keys

• Managing Compartments

• Managing Vaults

• Managing Secrets

component_keyring_oci configuration files have these properties:

• A configuration file must be in valid JSON format.

• A configuration file permits these configuration items:

  • "read_local_config": This item is permitted only in the global configuration file. If the item is not present, the component uses only the global configuration file. If the item is present, its value is true or false, indicating whether the component should read configuration information from the local configuration file.

    If the "read_local_config" item is present in the global configuration file along with other items, the component checks the "read_local_config" item value first:

    • If the value is false, the component processes the other items in the global configuration file and ignores the local configuration file.

    • If the value is true, the component ignores the other items in the global configuration file and attempts to read the local configuration file.

  • “user”: The OCID of the Oracle Cloud Infrastructure user that component_keyring_oci uses for connections. Prior to using component_keyring_oci, the user account must exist and be granted access to use the configured Oracle Cloud Infrastructure tenancy, compartment, and vault resources. To obtain the user OCID from the Console, use the instructions at Required Keys and OCIDs.

    This value is mandatory.

  • “tenancy”: The OCID of the Oracle Cloud Infrastructure tenancy that component_keyring_oci uses as the location of the MySQL compartment. Prior to using component_keyring_oci, you must create a tenancy if it does not exist. To obtain the tenancy OCID from the Console, use the instructions at Required Keys and OCIDs.

    This value is mandatory.

  • “compartment”: The OCID of the tenancy compartment that component_keyring_oci uses as the location of the MySQL keys. Prior to using component_keyring_oci, you must create a MySQL compartment or subcompartment if it does not exist. This compartment should contain no vault keys or vault secrets. It should not be used by systems other than MySQL Keyring. For information about managing compartments and obtaining the OCID, see Managing Compartments.

    This value is mandatory.

  • “virtual_vault”: The OCID of the Oracle Cloud Infrastructure Vault that component_keyring_oci uses for encryption operations. Prior to using component_keyring_oci, you must create a new vault in the MySQL compartment if it does not exist. (Alternatively, you can reuse an existing vault that is in a parent compartment of the MySQL compartment.) Compartment users can see and use only the keys in their respective compartments. For information about creating a vault and obtaining the vault OCID, see Managing Vaults.

    This value is mandatory.

  • “encryption_endpoint”: The endpoint of the Oracle Cloud Infrastructure encryption server that component_keyring_oci uses for generating encrypted or encoded information (ciphertext) for new keys. The encryption endpoint is vault specific and Oracle Cloud Infrastructure assigns it at vault-creation time. To obtain the endpoint OCID, view the configuration details for your keyring_oci vault, using the instructions at Managing Vaults.

    This value is mandatory.

  • "management_endpoint": The endpoint of the Oracle Cloud Infrastructure key management server that component_keyring_oci uses for listing existing keys. The key management endpoint is vault specific and Oracle Cloud Infrastructure assigns it at vault-creation time. To obtain the endpoint OCID, view the configuration details for your keyring_oci vault, using the instructions at Managing Vaults.

    This value is mandatory.

  • “vaults_endpoint”: The endpoint of the Oracle Cloud Infrastructure vaults server that component_keyring_oci uses for obtaining the value of secrets. The vaults endpoint is vault specific and Oracle Cloud Infrastructure assigns it at vault-creation time. To obtain the endpoint OCID, view the configuration details for your keyring_oci vault, using the instructions at Managing Vaults.

    This value is mandatory.

  • “secrets_endpoint”: The endpoint of the Oracle Cloud Infrastructure secrets server that component_keyring_oci uses for listing, creating, and retiring secrets. The secrets endpoint is vault specific and Oracle Cloud Infrastructure assigns it at vault-creation time. To obtain the endpoint OCID, view the configuration details for your keyring_oci vault, using the instructions at Managing Vaults.

    This value is mandatory.

  • “master_key”: The OCID of the Oracle Cloud Infrastructure master encryption key that component_keyring_oci uses for encryption of secrets. Prior to using component_keyring_oci, you must create a cryptographic key for the Oracle Cloud Infrastructure compartment if it does not exist. Provide a MySQL-specific name for the generated key and do not use it for other purposes. For information about key creation, see Managing Keys.

    This value is mandatory.

  • “key_file”: The path name of the file containing the RSA private key that component_keyring_oci uses for Oracle Cloud Infrastructure authentication. You must also upload the corresponding RSA public key using the Console. The Console displays the key fingerprint value, which you can use to set the "key_fingerprint" value. For information about generating and uploading API keys, see Required Keys and OCIDs.

    This value is mandatory.

  • “key_fingerprint”: The fingerprint of the RSA private key that component_keyring_oci uses for Oracle Cloud Infrastructure authentication. To obtain the key fingerprint while creating the API keys, execute this command:

    openssl rsa -pubout -outform DER -in ~/.oci/oci_api_key.pem | openssl md5 -c

    Alternatively, obtain the fingerprint from the Console, which automatically displays the fingerprint when you upload the RSA public key. For information about obtaining key fingerprints, see Required Keys and OCIDs.

    This value is mandatory.

  • “ca_certificate”: The path name of the CA certificate bundle file that component_keyring_oci component uses for Oracle Cloud Infrastructure certificate verification. The file contains one or more certificates for peer verification. If no file is specified, the default CA bundle installed on the system is used. If the value is set to disabled (case-sensitive), component_keyring_oci performs no certificate verification.

Given the preceding configuration file properties, to configure component_keyring_oci, create a global configuration file named component_keyring_oci.cnf in the directory where the component_keyring_oci library file is installed, and optionally create a local configuration file, also named component_keyring_oci.cnf, in the data directory.

Verify the Component Installation

After performing any component-specific configuration, start the server. Verify component installation by examining the Performance Schema keyring_component_status table:

mysql> SELECT * FROM performance_schema.keyring_component_status;
+---------------------+--------------------------------------------------------------------+
| STATUS_KEY          | STATUS_VALUE                                                       |
+---------------------+--------------------------------------------------------------------+
| Component_name      | component_keyring_oci                                              |
| Author              | Oracle Corporation                                                 |
| License             | PROPRIETARY                                                        |
| Implementation_name | component_keyring_oci                                              |
| Version             | 1.0                                                                |
| Component_status    | Active                                                             |
| user                | ocid1.user.oc1..aaaaaaaasqly<...>                                  |
| tenancy             | ocid1.tenancy.oc1..aaaaaaaai<...>                                  |
| compartment         | ocid1.compartment.oc1..aaaaaaaah2swh<...>                          |
| virtual_vault       | ocid1.vault.oc1.iad.bbo5xyzkaaeuk.abuwcljtmvxp4r<...>              |
| master_key          | ocid1.key.oc1.iad.bbo5xyzkaaeuk.abuwcljrbsrewgap<...>              |
| encryption_endpoint | bbo5xyzkaaeuk-crypto.kms.us-<...>                                  |
| management_endpoint | bbo5xyzkaaeuk-management.kms.us-<...>                              |
| vaults_endpoint     | vaults.us-<...>                                                    |
| secrets_endpoint    | secrets.vaults.us-<...>                                            |
| key_file            | ~/.oci/oci_api_key.pem                                             |
| key_fingerprint     | ca:7c:e1:fa:86:b6:40:af:39:d6<...>                                 |
| ca_certificate      | disabled                                                           |
+---------------------+--------------------------------------------------------------------+

A Component_status value of Active indicates that the component initialized successfully.

If the component cannot be loaded, server startup fails. Check the server error log for diagnostic messages. If the component loads but fails to initialize due to configuration problems, the server starts but the Component_status value is Disabled. Check the server error log, correct the configuration issues, and use the ALTER INSTANCE RELOAD KEYRING statement to reload the configuration.

It is possible to query MySQL server for the list of existing keys. To see which keys exist, examine the Performance Schema keyring_keys table.

mysql> SELECT * FROM performance_schema.keyring_keys;
+-----------------------------+--------------+----------------+
| KEY_ID                      | KEY_OWNER    | BACKEND_KEY_ID |
+-----------------------------+--------------+----------------+
| audit_log-20210322T130749-1 |              |                |
| MyKey                       | me@localhost |                |
| YourKey                     | me@localhost |                |
+-----------------------------+--------------+----------------+

Vault Keyring Component Usage

component_keyring_oci supports the functions that comprise the standard MySQL Keyring service interface. Keyring operations performed by those functions are accessible at two levels:

• SQL interface: In SQL statements, call the functions described in Section 6.4.15, “General-Purpose Keyring Key-Management Functions”.

• C interface: In C-language code, call the keyring service functions described in The Keyring Service.

Example (using the SQL interface):

SELECT keyring_key_generate('MyKey', 'AES', 32);
SELECT keyring_key_remove('MyKey');

For information about the characteristics of key values permitted by component_keyring_oci, see Section 6.4.13, “Supported Keyring Key Types and Lengths”.