Network Deployment (Distributed operating systems), v8.0 > Secure applications and their environment > Authenticate users > Select a registry or repository > Configure LDAP user registries

Configure LDAP search filters

Use this topic to configure the LDAP search filters. These steps are required to modify existing user and group filters for a particular LDAP directory type, and also to set up certificate filters to map certificates to entries in the LDAP server.

WAS uses LDAP filters to search and obtain information about users and groups from an LDAP directory server. A default set of filters is provided for each LDAP server that the product supports. We can modify these filters to fitthe LDAP configuration. After the filters are modified and you click OK or Apply the directory type in the Standalone LDAP registry panel changes to custom, which indicates that custom filters are used. Also, you can develop filters to support any additional type of LDAP server. The effort to support additional LDAP directories is optional and other LDAP directory types are not supported. Complete the following steps in the admin console.

Procedure

1. Click Security > Global security.

2. Under User account repository, select Standalone LDAP registry and click Configure.

3. Under Additional properties, click Advanced LDAP user registry settings.
4. Modify the user filter, if necessary. The user filter is used for searching the registry for users and is typically used for the security role-to-user assignment. The filter is also used to authenticate a user with the attribute specified in the filter. The filter specifies the property used to look up users in the directory service.

   In the following example, the property that is assigned to %v, which is the short name of the user, must be a unique key. Two LDAP entries with the same object class cannot have the same short name.

   To look up users based on their user IDs (uid) and to use the inetOrgPerson object class, specify the following syntax:

   (&(uid=%v)(objectclass=inetOrgPerson)

   For more information about this syntax, see the Use specific directory servers as the LDAP server documentation.

5. Modify the Kerberos user filter, if necessary. The Kerberos user filter name is used for searching the registry for the Kerberos principal name. Specify the LDAP attribute that holds the Kerberos principal name.
   IBM Lotus Domino default krbuser filter:
   (&(krbPrincipalName=%v)(objectcategory=Person))
   IBM SecureWay Directory Server default krbuser filter:
   (&(krbPrincipalName=%v)(objectcategory=ePerson))
   Microsoft Active Directory default krbuser filter:
   (&(userprincipalname=%v)(objectcategory=user))
   Sun Java System Directory Server default krbuser filter:
   (&(krbPrincipalName=%v)(objectcategory=inetOrgPerson))
   Novell eDirectory default krbuser filter:
   (&(krbPrincipalName=%v)(objectcategory=Person))

6. Optional: If your using Federated Repositories, modify the Kerberos attribute name if necessary. The Kerberos attribute name is used for searching the registry for Kerberos principal. Specify the LDAP attribute that holds the Kerberos principal name.
   IBM Lotus Domino default krbuser filter:
   krbPrincipalName
   IBM SecureWay Directory Server default krbuser filter:
   krbPrincipalName
   Microsoft Active Directory default krbuser filter:
   userprincipalname
   Sun Java System Directory Server default krbuser filter:
   krbPrincipalName
   Novell eDirectory default krbuser filter:
   krbPrincipalName
7. Modify the group filter, if necessary. The group filter is used in searching the registry for groups and is typically used for the security role-to-group assignment. Also, the filter is used to specify the property by which to look up groups in the directory service.

   In the following example, the property that is assigned to %v, which is the short name of the group, must be a unique key. Two LDAP entries with the same object class cannot have the same short name.

   To look up groups based on their common names (CN) and to use either the groupOfNames object class or the groupOfUniqueNames object class, specify the following syntax:

   (&(cn=%v)(|(objectclass=groupOfNames)(objectclass=groupOfUniqueNames)))

   For more information about this syntax, see the Use specific directory servers as the LDAP server documentation.

8. Modify the user ID map, if necessary. This filter maps the short name of a user to an LDAP entry and specifies the piece of information that represents users when these users are displayed with their short names. For example, to display entries of object class = inetOrgPerson by their IDs, specify inetOrgPerson:uid. This field takes multiple objectclass:property pairs, delimited by a semicolon (;).

   To provide a consistent value for methods like the getCallerPrincipal method and the getUserPrincipal method, the short name that is obtained by using this filter is used. For example, the CN=Bob Smith, ou=austin.ibm.com, o=IBM, c=US user can log in using any attributes that are defined, for example, email address, social security number, and so on, but when these methods are called, the bob user ID is returned no matter how the user logs in.

   Only the getUserDisplayName API honors the user ID map.

9. Modify the group ID map filter, if necessary. This filter maps the short name of a group to an LDAP entry and specifies the piece of information that represents groups when groups display. For example, to display groups by their names, specify *:cn. The asterisk (*) is a wildcard character that searches on any object class in this case. This field takes multiple objectclass:property pairs, delimited by a semicolon (;).
10. Modify the group member ID map filter, if necessary. This filter identifies user-to-group memberships. For SecureWay, and Domino directory types, this field is used to query all the groups that match the specified object classes to see if the user is contained in the specified attribute. For example, to get all the users that belong to groups with the groupOfNames object class and the users that are contained in the member attributes, specify groupOfNames:member. This syntax, which is a property of an object class, stores the list of members that belong to the group that is represented by the object class. This field takes multiple objectclass:property pairs that are delimited by a semicolon (;). For more information about this syntax, see the Use specific directory servers as the LDAP server.

    For the IBM Tivoli Directory Server, Sun ONE, and Active Directory, this field is used to query all users in a group with the information stored in the user object. For example, the memberof:member filter (for Active Directory) is used to get the memberof attribute of the user object to obtain all the groups to which the user belongs. The member attribute is used to get all the users in a group that use the Group object. Using the User object to obtain the group information improves performance.

11. Select the Perform a nested group search option ifthe LDAP server does not support recursive server-side searches.
12. Modify the Certificate map mode, if necessary. We can use the X.590 certificates for user authentication when LDAP is selected as the registry. This field is used to indicate whether to map the X.509 certificates into an LDAP directory user by EXACT_DN or CERTIFICATE_FILTER. If EXACT_DN is selected, the DN in the certificate must exactly match the user entry in the LDAP server, including case and spaces.

    Select the Ignore case for authorization option on the Standalone LDAP registry settings to make the authorization case insensitive.

    To access the Standalone LDAP registry settings panel...

    1. Click Security > Global security.

    2. Under User account repository, click the Available realm definitions drop-down list, selectStandalone LDAP registry.

13. If you select CERTIFICATE_FILTER, specify the LDAP filter for mapping attributes in the client certificate to entries in LDAP. If more than one LDAP entry matches the filter specification at run time, authentication fails because an ambiguous match results. The syntax or structure of this filter is: LDAP attribute=${Client certificate attribute} (for example, uid=${SubjectCN}).

    The left side of the filter specification is an LDAP attribute that depends on the schema thatthe LDAP server is configured to use. The right side of the filter specification is one of the public attributes in your client certificate. Note that the right side must begin with a dollar sign ($), open bracket ({), and end with a close bracket (}). Use the following certificate attribute values on the right side of the filter specification. The case of the strings is important.

    • ${UniqueKey}
    • ${PublicKey}
    • ${IssuerDN}
    • ${Issuer <xx>}

      where <xx> is replaced by the characters that represent any valid component of the Issuer Distinguished Name. For example, you might use ${IssuerCN} for the Issuer Common Name.

    • ${NotAfter}
    • ${NotBefore}
    • ${SerialNumber}
    • ${SigAlgName}
    • ${SigAlgOID}
    • ${SigAlgParams}
    • ${SubjectDN}
    • ${Subject <xx>}

      where <xx> is replaced by the characters that represent any valid component of the Subject Distinguished Name. For example, you might use ${SubjectCN} for the Subject Common Name.

    • ${Version}

    To enable this field, select CERTIFICATE_FILTER for the certificate mapping. Subject alternative names (SANs) are not supported as certificate filter items.

14. Click Apply.

    When any LDAP user or group filter is modified in the Advanced LDAP Settings panel click Apply. Clicking OK navigates you to the Standalone LDAP registry panel, which contains the previous LDAP directory type, rather than the custom LDAP directory type. Clicking OK or Apply in the Standalone LDAP registry panel saves the back-level LDAP directory type and the default filters of that directory. This action overwrites any changes to the filters that you made.

    To avoid overwriting changes, you can take either of the following actions:

    • Click Apply in the Advanced LDAP user registry settings panel. Click Security > Global security and change the User account repository type to Stand-alone custom registry.

    • Select Custom type from the Standalone LDAP registry panel. Click Apply and then change the filters by clicking the Advanced LDAP user registry settings panel. After you complete your changes, click Apply or OK.

    The validation of the changes does not take place in this panel. Validation is done when you click OK or Apply on the Global security panel. If you are in the process of enabling security for the first time, complete the remaining steps and go to the Global security panel. Select Standalone LDAP registry as the user account repository. If security is already enabled and any information on this panel changes, go to the Global security panel and click OK or Apply to validate your changes. If your changes are not validated, the server might not start.

Results

These steps result in the configuration of the LDAP search filters. These steps are required to modify existing user and group filters for a particular LDAP directory type. The steps are also used to set up certificate filters to map certificates to entries in the LDAP server.

What to do next

1. Validate this setup by clicking OK or Apply on the Global security panel.

2. Save, stop, and start all the product servers, including the cell, nodes and all of the application servers for any changes in this panel to become effective.

3. After the server starts, go through all the security-related tasks (getting users, getting groups, and so on) to verify that the changes to the filters function.

Standalone LDAP registries
Local operating system registries
Enable security
Migrate a stand-alone LDAP repository to a federated repositories LDAP repository configuration
Configure LDAP user registries

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