Map SASL principals to DNs for ACI validation
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                 Key: DIRSERVER-1453
                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1453
             Project: Directory ApacheDS
          Issue Type: New Feature
            Reporter: Aaron J Angel


SASL authentication is not useful when using access control entries for 
authorization.  Access control is based on a user's DN, but SASL 
principals/userIDs do not appear to be automatically mapped to the appropriate 
user's DN.  For example, if I authentication using GSSAPI as the user 
'aKrbUser', whose credentials are stored in entry 
uid=aKrbUser,dc=example,dc=com, the user should be authenticated to the 
directory and mapped to uid=aKrbUser,dc=example,dc=com for access control 
validation.

See OpenLDAP's sasl-regexp parameter in slapd.conf for reference.  Example:

sasl-regexp cn=(.*),cn=example.com,cn=gssapi,cn=auth 
ldap:///dc=example,dc=com??sub?(uid=$1)

In OpenLDAP, the above line would search the directory context 
dc=example,dc=com for an entry where the uid attribute value matches the GSSAPI 
user ID and assign assign the entry's DN as the binddn.

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