Network Deployment (Distributed operating systems), v8.0 > Tune performance > Tune security > Tune, hardening, and maintaining security configurations

Tune security configurations

We can tune security to balance performance with function. We can achieve this balance following considerations for tuning general security, Common Secure Interoperability version 2 (CSIv2), LDAP authentication, web authentication, and authorization. Performance issues typically involve trade-offs between function and speed. Usually, the more function and the more processing that are involved, the slower the performance. Consider what type of security is necessary and what you can disable in the environment. For example, if the application servers are running in a Virtual Private Network (VPN), consider whether you can disable SSL. If we have a lot of users, can they be mapped to groups and then associated to your Java EE roles? These questions are things to consider when designing the security infrastructure.

Procedure

• Consider the following recommendations for tuning general security.
  • Consider disabling Java 2 security manager if you know exactly what code is put onto your server and you do not need to protect process resources. Remember that in doing so, you put your local resources at some risk.
  • Consider propagating new security settings to all nodes before restarting the dmgr and node agents, to change the new security policy.

    If the security configurations are not consistent across all servers, you get access denied errors. Therefore, propagate new security settings when enabling or disabling administrative security.

    Configuration changes are generally propagated using configuration synchronization. If auto-synchronization is enabled, you can wait for the automatic synchronization interval to pass, or you can force synchronization before the synchronization interval expires. If you are using manual synchronization, synchronize all the nodes.

    If the cell is in a configuration state and the security policy is mixed with nodes that have security enabled and disabled, you can use the syncNode utility to synchronize the nodes where the new settings are not propagated.

    For more detailed information about enabling security in a distributed environment, see Enable security for the realm.

  • Consider increasing the cache and token timeout if you feel the environment is secure enough. By increasing these values, we have to re-authenticate less often. This action supports subsequent requests to reuse the credentials that already are created. The downside of increasing the token timeout is the exposure of having a token hacked and providing the hacker more time to hack into the system before the token expires. We can use security cache properties to determine the initial size of the primary and secondary hashtable caches, which affect the frequency of rehashing and the distribution of the hash algorithms.

    See the article Authentication cache settings for a list of these properties.

  • Consider changing your administrative connector from Simple Object Access Protocol (SOAP) to RMI because RMI uses stateful connections while SOAP is completely stateless. Run a benchmark to determine if the performance is improved in the environment.

  • Use the wsadmin script to complete the access IDs for all the users and groups to speed up the application startup. Complete this action if applications contain many users or groups, or if applications are stopped and started frequently. WAS maps user and group names to unique access IDs in the authorization table. The exact format of the access ID depends on the repository. The access ID can only be determined during and after application deployment. Authorization tables created during assembly time do not have the proper access IDs. See the Commands for the AdminApp article for more information about how to update access IDs.
  • Consider tuning the ORB because it is a factor in enterprise bean performance with or without security enabled. Refer to the information about ORB tuning guidelines.

  • If using SSL, enable the SSL session tracking mechanism option as described in the information about session management settings.

  • In some cases, using the unrestricted Java Cryptography Extension (JCE) policy file can improve performance. Refer to the information about tuning Web Services Security.
  • Distribute the workload to multiple Java virtual machines (JVMs) instead of a single JVM on a single machine can improve the security performance because there is less contention for authorization decisions.

• Consider the following steps to tune Common Secure Interoperability version 2 (CSIv2).
  • Consider using SSL client certificates instead of a user ID and password to authenticate Java clients. Because you are already making the SSL connection, using mutual authentication adds little overhead while it removes the service context that contains the user ID and password completely.

  • If you send a large amount of data that is not very security sensitive, reduce the strength of your ciphers. The more data we have to bulk encrypt and the stronger the cipher, the longer this action takes. If the data is not sensitive, do not waste your processing with 128-bit ciphers.
  • Consider putting only an asterisk (*) in the trusted server ID list (meaning trust all servers) when you use identity assertion for downstream delegation. Use SSL mutual authentication between servers to provide this trust. Adding this extra step in the SSL handshake performs better than having to fully authenticate the upstream server and check the trusted list. When an asterisk (*) is used, the identity token is trusted. The SSL connection trusts the server through client certificate authentication.
  • Ensure that stateful sessions are enabled for CSIv2. This is the default, but requires authentication only on the first request and on any subsequent token expirations.
  • Consider changing the values for the CSIv2 session cache. Changing these values can avoid resource shortages. Refer to the CSIv2 outbound communications topic for more information.

  • If you are communicating only with WAS v5 or higher servers, make the Active Authentication Protocol CSI, instead of CSI and SAS. This action removes an interceptor invocation for every request on both the client and server sides.

    SAS is supported only between v6.0.x and previous version servers that have been federated in a v6.1 cell.

• Consider the following steps to tune LDAP authentication.

  1. In the administration console, click Security > Global security.

  2. Under User account repository, click the Available realm definitions drop-down list, select Standalone LDAP registry and click Configure.

  3. Select the Ignore case for authorization option in the stand-alone LDAP registry configuration, when case-sensitivity is not important.

  4. Select the Reuse connection option.

  5. Use the cache features thatthe LDAP server supports.

  6. Choose either the IBM Tivoli Directory Server or SecureWay directory type, if you are using an IBM Tivoli Directory Server. The IBM Tivoli Directory Server yields improved performance because it is programmed to use the new group membership attributes to improve group membership searches. However, authorization must be case insensitive to use IBM Tivoli Directory Server.

  7. Choose either iPlanet Directory Server (also known as Sun ONE) or Netscape as the directory if you are an iPlanet Directory user. Using the iPlanet Directory Server directory can increase performance in group membership lookup. However, use Role only for group mechanisms.

• Consider the following steps to tune web authentication.

  • Increase the cache and token timeout values if you feel the environment is secure enough. The web authentication information is stored in these caches and as long as the authentication information is in the cache, the login module is not invoked to authenticate the user. This supports subsequent requests to reuse the credentials that are already created. A disadvantage of increasing the token timeout is the exposure of having a token stolen and providing the thief more time to hack into the system before the token expires.
  • Enable single sign-on (SSO).

    To configure SSO, click Security > Global security. Under Web security, click Single sign-on (SSO).

    SSO is only available when you configure LTPA as the authentication mechanism in the Authentication mechanisms and expiration panel. Although you can select Simple WebSphere Authentication Mechanism (SWAM) as the authentication mechanism on the Authentication mechanisms and expiration panel, SWAM is deprecated in v8.0 and does not support SSO. When you select SSO, a single authentication to one application server is enough to make requests to multiple application servers in the same SSO domain. Some situations exist where SSO is not a desirable and you do not want to use it in those situations.

  • Disable or enable the Web Inbound Security Attribute Propagation option on the Single sign-on (SSO) panel if the function is not required. In some cases, having the function enabled can improve performance. This improvement is most likely for higher volume cases where a considerable number of user registry calls reduces performance. In other cases, having the feature disabled can improve performance. This improvement is most likely when the user registry calls do not take considerable resources.
  • The following two custom properties might help to improve performance when security attribute propagation is enabled:
    • com.ibm.CSI.propagateFirstCallerOnly

      Default is true. When this custom property is set to true the first caller in the propagation token that stays on the thread is logged when security attribute propagation is enabled. When this property is set to false, all of the caller switches are logged, which can affect performance.

    • com.ibm.CSI.disablePropagationCallerList

      When this custom property is set to true the ability to add a caller or host list in the propagation token is completely disabled. This function is beneficial when the caller or host list in the propagation token is not needed in the environment.

• Consider the following steps to tune authorization.
  • Map your users to groups in the user registry. Associate the groups with your Java EE roles. This association greatly improves performance when the number of users increases.
  • Judiciously assign method-permissions for enterprise beans. For example, you can use an asterisk (*) to indicate all the methods in the method-name element. When all the methods in enterprise beans require the same permission, use an asterisk (*) for the method-name to indicate all methods. This indication reduces the size of deployment descriptors and reduces the memory that is required to load the deployment descriptor. It also reduces the search time during method-permission match for the enterprise beans method.
  • Judiciously assign security-constraints for servlets. For example, you can use the *.jsp URL pattern to apply the same authentication data constraints to indicate all JSP files. For a given URL, the exact match in the deployment descriptor takes precedence over the longest path match. Use the *.jsp, *.do, *.html extension match if no exact matches exist and longest path matches exist for a given URL in the security constraints.

• Use new tuning parameters when using Java 2 security. The new tuning parameters can improve performance significantly, and introduce a new concept called Read-only Subject, which enables a new cache for J2C Auth Subjects when using container-managed auth data aliases. If the J2C auth subject does not need to be modified after it is created, the following new tuning parameters can be used to improve Java 2 Security performance:
  • com.ibm.websphere.security.auth.j2c.cacheReadOnlyAuthDataSubjects=true
  • com.ibm.websphere.security.auth.j2c.readOnlyAuthDataSubjectCacheSize=50 (This is the maximum number of subjects in the hashtable of the cache. Once the cache reaches this size, some of the entries are purged. For better performance, this size should be equal to the number of unique subjects (cache based on uniqueness of user principal + auth data alias + managed connection factory instance) when role-based security and Java 2 security are used together).

• Use new tuning parameters to improve the performance of Security Attribute Propagation. The new tuning parameters can be set through custom properties in the admin console to reduce the extra overhead of Security Attribute Propagation:
  • com.ibm.CSI.disablePropagationCallerList=true
  • com.ibm.CSI.propagateFirstCallerOnly=true (use to track the first caller only).

Results

You always have a trade off between performance, feature, and security. Security typically adds more processing time to your requests, but for a good reason. Not all security features are required in the environment. When you decide to tune security, create a benchmark before making any change to ensure that the change is improving performance.

What to do next

In a large scale deployment, performance is very important. Running benchmark measurements with different combinations of features can help you to determine the best performance versus the benefit of configuration for the environment. Continue to run benchmarks if anything changes in the environment, to help determine the impact of these changes.

Related

SSL performance tips
Tune security performance
Tune Web Services Security for v8.0 applications
Tune, hardening, and maintaining security configurations

Related

Commands for the AdminApp object using wsadmin.sh
CSIv2 outbound communications settings
Session management settings

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