One aspect of password policy involves refusing passwords that do not meet your quality criteria. When a user submits a password value, that value is to be stored on her entry in the userPassword(5dsat) attribute. You might want the server to ensure the password value is not easy to guess or to discover. You might also want the server to log a warning when a weak password is accepted, or even to refuse weak passwords. Determining what you want is part of setting up a password policy.
The password policy entry attribute that governs to what extent the server checks password quality is pwdCheckQuality(5dsat). When this attribute is set to cause the server to check password quality, the server can call plug-ins to do so. This chapter shows how to write a plug-in that checks password quality.
For a more extensive explanation of password policy configuration, see Chapter 7, Directory Server Password Policy, in Sun Java System Directory Server Enterprise Edition 6.0 Administration Guide.