Securing WebLogic Server
WebLogic Server includes an embedded LDAP server that acts as the default security provider data store for the WebLogic Authentication, Authorization, Credential Mapping, and Role Mapping providers.The following sections explain how to manage the embedded LDAP server:
The embedded LDAP server contains user, group, group membership, security role, security policy, and credential map information. By default, each WebLogic Server domain has an embedded LDAP server configured with the default values set for each type of information. The WebLogic Authentication, Authorization, Credential Mapping, and Role Mapping providers use the embedded LDAP server as their data store. If you use any of these providers in a new security realm, you may want to change the default values for the embedded LDAP server to optimize its use in your environment.
See Configure the embedded LDAP server in the Administration Console online help.
The data file and change log file used by the embedded LDAP server can potentially grow quite large. You can configure maximum sizes for these files with the following
weblogic.Server command line arguments:
-Dweblogic.security.ldap.maxSize=<max bytes>, which limits the size of the data file used by the embedded LDAP server. When the data file exceeds the specified size, WebLogic Server eliminates from the data file space occupied by deleted entries.
-Dweblogic.security.ldap.changeLogThreshold=<number of entries>, which limits the size of the change log file used by the embedded LDAP server. When the change log file exceeds the specified number of entries, WebLogic Server truncates the change log by removing all entries that have been sent to all managed servers.
The WebLogic Server embedded LDAP server for a domain consists of a master LDAP server, maintained in the domain's Administration Server, and a replicated LDAP server maintained in each Managed Server in the domain. When changes are made using a Managed Server, updates are sent to the embedded LDAP server on the Administration Server. The embedded LDAP server on the Administration Server maintains a log of all changes. The embedded LDAP server on the Administration Server also maintains a list of Managed Servers and the current change status for each one. The embedded LDAP server on the Administration Server sends appropriate changes to each Managed Server and updates the change status for each server. This process occurs when an update is made to the embedded LDAP server on the Administration Server. However, depending on the number of updates, it may take several seconds or more for the change to be replicated to the Managed Server.
You can configure the behavior of the embedded LDAP server on the Administration Server and the Managed Servers in a domain using the Administration Console. On the Domain: Security: Embedded LDAP Server page in the Administration Console, you can set these attributes:
See Configure the embedded LDAP server in the Administration Console online help.
Note: Deleting and modifying the configured security providers through the WebLogic Administration Console may require manual clean up of the embedded LDAP server. Use an external LDAP browser to delete unnecessary information.
mydomainis the name of the WebLogic Server domain you are using.
Note: You can also view the contents of the embedded LDAP server by exporting its data and reviewing the exported file. See Exporting and Importing Information in the Embedded LDAP Server.
You can export and import data from the embedded LDAP server using either the WebLogic Server Administration Console or an LDAP browser. To export and import data with the Console, use the Migration page of each security provider. See Export data from a security provider and Import data into a security provider in the Administration Console online help.
This section describes how to use an LDAP browser to export and import data stored in the embedded LDAP server. Table 9-1 summarizes where data is stored in the hierarchy of the embedded LDAP server.
The embedded LDAP server supports the IETF LDAP Access Control Model for LDAPv3. This section describes how that access control is implemented within the embedded LDAP server. You can apply these rules directly to entries within the directory as intended by the standard or you can configure and maintain them by editing the access control file (
Note: The default behavior of the embedded LDAP server is to allow access only from the Admin account in WebLogic Server. The WebLogic security providers use only the Admin account to access the embedded LDAP server. If you are not planning to access the embedded LDAP server from an external LDAP browser or if you are planning only to use the Admin account, you do not need to edit the
acls.prop file and can ignore the information in this section.
The access control file (
acls.prop) maintained by the embedded LDAP server contains the complete list of access control lists (ACLs) for an entire LDAP directory. Each line in the access control file contains a single access control rule. An access control rule is made up of the following components:
Listing 9-1 shows a sample access control file.
Each access control rule is applied to a given location in the LDAP directory. The location is normally a distinguished name (DN) but the special location
[root] can be specified in the
acls.prop file if the access control rule applies to the entire directory.
If an entry in the directory is covered by conflicting access control rules (for example, where one rule is an Entry rule and the other is a Subtree rule), the Entry rule takes precedence over rules that apply because of the Subtree rule.
Access rights apply to an entire object or to attributes of the object. Access can be granted or denied. Either of the actions
deny may be used when you create or update the access control rule.
m permission is required for all attributes placed on an object when it is created. Just as the
o permissions are used in the Modify operation, the
m permission is used in the Add operation. The
o permissions have no bearing on the Add operation and
m has no bearing on the Modify operation. Since a new object does not yet exist, the
m permissions needed to create it must be granted to the parent of the new object. This requirement differs from
o permissions which must be granted on the object being modified. The
m permission is distinct and separate from the
o permissions so that there is no conflict between the permissions needed to add new children to an entry and the permissions needed to modify existing children of the same entry. In order to replace values with the Modify operation, a user must have both the
Add an entry below this LDAP entry. If granted, permits creation of an entry in the DIT subject to control on all attributes and values placed on the new entry at the time of creation. In order to add an entry, permission must also be granted to add at least the mandatory attributes.
If granted, permits an entry and its subentries (if any) to be exported; that is, removed from the current location and placed in a new location subject to the granting of suitable permission at the destination.
In order to export an entry or its subentries, there are no prerequisite permissions to the contained attributes, including the RDN attribute. This is true even when the operation causes new attribute values to be added or removed as the result of the changes to the RDN.
If granted, permits an entry and its subentries (if any) to be imported; that is, removed from one location and placed at the specified location (if suitable permissions for the new location are granted).
When you import an entry or its subentries, the contained attributes, including the RDN attributes, have no prerequisite permissions. This is true even when the operation causes new attribute values to be added or removed as the result of the changes to RDN.
Change the DN of an LDAP entry. Granting the
When you rename an entry, there are no prerequisite permissions for the contained attributes, including the RDN attributes. This is true even when the operation causes new attribute values to be added or removed as the result of the changes of RDN.
[entry]indicates the permissions apply to the entire object. This could mean actions such as delete the object, or add a child object.
[all]indicates the permissions apply to all attributes of the entry.
authzID—Applies to a single user that can be specified as part of the subject definition. The identity of that user in the LDAP directory is typically defined as a DN.
Group—Applies to a group of users specified by one of the following object classes:
Subtree—Applies to the DN specified as part of the subject and all subentries in the LDAP directory tree.
IP Address—Applies to a particular Internet address. This subject type is useful when all access must come through a proxy or other server. Applies only to a particular host, not to a range or subnet.
Public—Applies to anyone connected to the directory, whether they are authenticated or not.
This—Applies to the user whose DN matches that of the entry being accessed.
The decision whether to grant or deny a client access to the information in an entry is based on many factors related to the access control rules and the entry being protected. Throughout the decision making process, these guiding principles apply:
IP Addresssubject are given the highest precedence, followed by rules that are applied to a specific
Thissubject. Next in priority are rules that apply to
Groupsubjects. Last priority is given to rules that apply to