When you create a Directory Proxy Server instance, the certificate database is automatically populated with the CA certificates of certain trusted CAs. You can add trusted CA certificates to the certificate database if necessary, by using the Directory Service Control Center (DSCC) or by using the dpadm command. For more information, see To Install a CA-Signed Server Certificate for Directory Proxy Server in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition.
When a client provides a certificate to Directory Proxy Server, the server verifies that certificate against the list of trusted CA certificates in its certificate database. The verification is successful if the server's certificate database contains the client certificate itself, or the CA certificate with which the client certificate was generated.
The server certificate can be one of the following:
Self-signed certificate. A public and private key pair, where the public key is signed by Directory Proxy Server.
Trusted CA certificate. A single certificate that is automatically generated by the company’s internal certificate server or by a known Certificate Authority (CA).
Directory Proxy Server also supports the use of a server certificate chain. A server certificate chain is a collection of certificates that are automatically generated by the company’s internal certificate server or by a known CA. The certificates in a chain trace back to the original CA, providing proof of identity. This proof is required each time you obtain or install a new server certificate.
When an instance of Directory Proxy Server is created, a default self-signed certificate is created. By default, Directory Proxy Server manages the SSL certificate database password internally.
You can install any number of certificates on a server. When you configure SSL for an instance of Directory Proxy Server, you must install at least one server certificate and one trusted CA certificate.
For an explanation of how certificate-based authentication works, see Certificate-Based Authentication. For information about how to configure certificate-based authentication for Directory Proxy Server, see To Configure Certificate-based Authentication in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition.