Configuring LDAP Services for Novell eDirectory
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Scenario: Using STARTTLS—
You create a clear connection (to port 389) and do some
anonymous searches. However, when you get into secure data, you prefer to start a TLS session. You
issue a STARTTLS extended operation to upgrade from a clear connection to an encrypted
connection. Your data is secure.
You stop TLS to turn an encrypted session into a clear connection. A clear connection requires less
overhead because data to and from the client is not encrypted and decrypted. Therefore, data moves
faster when you use a clear connection. At this point, the connection is downgraded to Anonymous.
When you authenticate, you use the LDAP Bind operation. Bind establishes your ID based on your
provided credentials. When you stop TLS, the LDAP service removes any authentication previously
established. Your authentication state changes to Anonymous. Therefore, if you want a state other
than Anonymous you must reauthenticate.
Scenario: Reauthenticating—
Henri runs STOPTLS. His status changes to Anonymous. To access
and use his files on the Net, Henri runs the Bind command, provides his login credentials, is
authenticated, and continues working in clear text on the Internet.
13.6.3 Configuring the Server for TLS
When a TLS session is instantiated, a handshake occurs. The server and the client exchange data.
The server determines how the handshake occurs. To establish that the server is legitimate, the
server always sends the server's certificate to the client. This handshake guarantees to the client that
the server is indeed the expected server.
To require that the client also establish legitimacy, you set a value on the server. This attribute is
ldapTLSVerifyClientCertificate.
Before the server can support TLS, you must provide the server with an X.509 certificate that the
server can use to establish its legitimacy.
This certificate is automatically provided during the eDirectory installation. During installation, Key
Material objects are created as part of Public Key Infrastructure (PKI) and Novell Modular
Authentication Services (NMAS
TM
). The following figure illustrates these objects in iManager:
Value
Description
0
Off. During a handshake, the server provides a certificate to the client. The server
never requires the client to send a certificate. The client can use or ignore the
certificate. A secure session is established.
1
During the handshake, the server provides a certificate to the client and requests a
certificate from the client. The client can choose to send its certificate back. The
client's certificate is validated. If the server cannot validate the client's certificate, the
connection is terminated.
If the client doesn't send a certificate, the server maintains the connection.
2
During the handshake, the server requests and requires a certificate from the client. If
the client does not provide a certificate, or if the certificate can't be validated, the
connection is terminated.
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