Repository Management with Nexus

8.4. Connection and Authentication

Figure 8.2, “A Simple LDAP Connection and Authentication Setup” shows a simplified LDAP configuration for Nexus configured to connect to an LDAP server running on localhost port 10389 using the search base of ou=system. On a more standard installation, you would likely not want to use Simple Authentication as it sends the password in clear text over the network, and you would also use a search base which corresponds to your organization’s top-level domain components such as dc=sonatype,dc=com.

figs/web/ldap_configure_connection_and_authentication.png

Figure 8.2. A Simple LDAP Connection and Authentication Setup


The following parameters can be configured in the Connection and Authentiation sections of the LDAP Configuration panel.

Protocol
Valid values in this drop-down are ldap and ldaps which correspond to the Lightweight Directory Access Protocol and the Lightweight Directory Access Protocol over SSL.
Hostname
The hostname or IP address of the LDAP
Port
The port on which the LDAP server is listening. Port 389 is the default port for the ldap protocol, and port 636 is the default port for the ldaps.
Search Base
The search base is the Distinguished Name (DN) to be appended to the LDAP query. The search base usually corresponds to the domain name of an organization. For example, the search base on the Sonatype LDAP server could be dc=sonatype,dc=com.
Authentication Method

Nexus provides four distinct authentication methods to be used when connecting to the LDAP Server:

Simple Authentication
Simple authentication is not recommended for production deployments not using the secure ldaps protocol as it sends a clear-text password over the network.
Anonymous Authentication
Used when Nexus only needs read-only access to non-protected entries and attributes when binding to the LDAP
Digest-MD5
This is an improvement on the CRAM-MD5 authentication method. For more information, see http://www.ietf.org/rfc/rfc2831.txt
CRAM-MD5
The Challenge-Response Authentication Method (CRAM) based on the HMAC-MD5 MAC algorithm. In this authentication method, the server sends a challenge string to the client, the client responds with a username followed by a Hex digest which the server compares to an expected value. For more information, see RFC 2195

For a full discussion of LDAP authentication approaches, see http://www.ietf.org/rfc/rfc2829.txt and http://www.ietf.org/rfc/rfc2251.txt

SASL Realm
The Simple Authentication and Security Layer (SASL) Realm to connect with. The SASL Realm is only available if the authentication method is Digest-MD5 or CRAM-MD5.
Username
Username of an LDAP User to connect (or bind) with. This is a Distinguished Name of a user who has read access to all users and groups
Password
Password for an Administrative LDAP User