Sun Java System Directory Server Enterprise Edition 6.2 Developer's Guide

What a Password Check Plug-In Must Do

If you decide to implement your own password check plug-in, it must be of type passwordcheck. Your plug-in must implement at least the password checking function, SLAPI_PLUGIN_PASSWDCHECK_FN. This function verifies that all passwords supplied in the parameter block array, SLAPI_PASSWDCHECK_VALS, satisfy the quality check. The SLAPI_PASSWDCHECK_VALS may contain more than one password value.

The function must return the following values, depending on the password values to check.


Return this value when you must send a failure result to the client application for a reason other than quality check failure. You might return this value for example when the server is busy loading a large dictionary file. The server then would not be ready to check password quality.

When you return this value, the server aborts the add or modify operation in progress.


Return this value when all passwords in SLAPI_PASSWDCHECK_VALS satisfy the password quality check.


Return a positive integer when at least one of the passwords in SLAPI_PASSWDCHECK_VALS fails the password quality check.

When you return a positive integer, pass an error message back through SLAPI_RESULT_TEXT in the parameter block with slapi_pblock_set(). Allocate space for the message using slapi_ch_malloc(). The server takes responsibility to free the memory allocated for the message.

The message string must start with invalid password syntax: , exactly as it is given here.

The server sends the client application a result of LDAP_CONSTRAINT_VIOLATION, 19. If, however, passwordRootdnMayBypassModsChecks(5dsat) is set to allow password administrators, including the directory root DN user, to modify passwords irrespective of password policy checks, the server nevertheless accepts modifications by that user.

In the simple case used in this chapter, the work is minimal. For real—world cases, the work might however be significant, particularly if you choose to implement your own dictionary check. If you implement your own dictionary check, the plug-in might cache the dictionary content from a large file. In this case, load the dictionary as part of a plug-in start function rather than part of plug-in initialization. You thus avoid blocking startup of the server while the cache is constructed.