Using LDAP Authentication with TLS/SSL

You can control access to Greenplum Database with an LDAP server and, optionally, secure the connection with encryption by adding parameters to pg_hba.conf file entries.

Greenplum Database supports LDAP authentication with the TLS/SSL protocol to encrypt communication with an LDAP server:

LDAP authentication with STARTTLS and TLS protocol – STARTTLS starts with a clear text connection (no encryption) and upgrades it to a secure connection (with encryption).
LDAP authentication with a secure connection and TLS/SSL (LDAPS) – Greenplum Database uses the TLS or SSL protocol based on the protocol that is used by the LDAP server.

If no protocol is specified, Greenplum Database communicates with the LDAP server with a clear text connection.

To use LDAP authentication, the Greenplum Database master host must be configured as an LDAP client. See your LDAP documentation for information about configuring LDAP clients.

Enabing LDAP Authentication with STARTTLS and TLS

To enable STARTTLS with the TLS protocol, specify the ldaptls parameter with the value 1. The default port is 389. In this example, the authentication method parameters include the ldaptls parameter.

ldap ldapserver=myldap.com ldaptls=1 ldapprefix="uid=" ldapsuffix=",ou=People,dc=pivotal,dc=com"

Specify a non-default port, with the ldapport parameter. In this example, the authentication method includes the ldaptls parameter and the and ldapport parameter to specify the port 550.

ldap ldapserver=myldap.com ldaptls=1 ldapport=500 ldapprefix="uid=" ldapsuffix=",ou=People,dc=pivotal,dc=com"

Enabing LDAP Authentication with a Secure Connection and TLS/SSL

To enable a secure connection with TLS/SSL, add ldaps:// as the prefix to the LDAP server name specified in the ldapserver parameter. The default port is 636.

This example ldapserver parameter specifies a secure connection and the TLS/SSL protocol for the LDAP server myldap.com.

ldapserver=ldaps://myldap.com

To specify a non-default port, add a colon (:) and the port number after the LDAP server name. This example ldapserver parameter includes the ldaps:// prefix and the non-default port 550.

ldapserver=ldaps://myldap.com:550

Notes

Greenplum Database logs an error if the following are specified in an pg_hba.conf file entry:

If both the ldaps:// prefix and the ldaptls=1 parameter are specified.
If both the ldaps:// prefix and the ldapport parameter are specified.

Enabling encrypted communication for LDAP authentication only encrypts the communication between Greenplum Database and the LDAP server.

See Encrypting Client/Server Connections for information about encrypting client connections.

Examples

These are example entries from an pg_hba.conf file.

This example specifies LDAP authentication with no encryption between Greenplum Database and the LDAP server.

host all plainuser 0.0.0.0/0 ldap ldapserver=myldap.com ldapprefix="uid=" ldapsuffix=",ou=People,dc=pivotal,dc=com"

This example specifies LDAP authentication with the STARTTLS and TLS protocol between Greenplum Database and the LDAP server.

host all tlsuser 0.0.0.0/0 ldap ldapserver=myldap.com ldaptls=1 ldapprefix="uid=" ldapsuffix=",ou=People,dc=pivotal,dc=com"

This example specifies LDAP authentication with a secure connection and TLS/SSL protocol between Greenplum Database and the LDAP server.

host all ldapsuser 0.0.0.0/0 ldap ldapserver=ldaps://myldap.com ldapprefix="uid=" ldapsuffix=",ou=People,dc=pivotal,dc=com"