Common Secure Interoperability Version 2 outbound communications settings

Specifies to support security attribute propagation during login requests. When you select this option, the application server retains additional information about the login request, such as the authentication strength used, and retains the identity and location of the request originator.

If you do not select this option, the application server does not accept any additional login information to propagate to downstream servers.

Specifies that identity assertion is a way to assert identities from one server to another during a downstream Enterprise JavaBeans (EJB) invocation.

This server does not authenticate the asserted identity again because it trusts the upstream server. Identity assertion takes precedence over all other types of authentication.

Identity assertion is performed in the attribute layer and is only applicable on servers. The principal determined at the server is based on precedence rules. If identity assertion is performed, the identity is always derived from the attribute layer. If basic authentication is used without identity assertion, the identity is always derived from the message layer. Finally, if SSL client certificate authentication is performed without either basic authentication, or identity assertion, then the identity is derived from the transport layer.

The identity asserted is the invocation credential that is determined by the RunAs mode for the enterprise bean. If the RunAs mode is Client, the identity is the client identity. If the RunAs mode is System, the identity is the server identity. If the RunAs mode is Specified, the identity is the one specified. The receiving server receives the identity in an identity token and also receives the sending server identity in a client authentication token. The receiving server validates the sending server identity as a trusted identity through the Trusted Server IDs entry box. Enter a list of pipe-separated (|) principal names, for example, serverid1|serverid2|serverid3.

All identity token types map to the user ID field of the active user registry. For an ITTPrincipal identity token, this token maps one-to-one with the user ID fields. For an ITTDistinguishedName identity token, the value from the first equal sign is mapped to the user ID field. For an ITTCertChain identity token, the value from the first equal sign of the distinguished name is mapped to the user ID field.

When authenticating to an LDAP user registry, the LDAP filters determine how an identity of type ITTCertChain and ITTDistinguishedName get mapped to the registry. If the token type is ITTPrincipal, then the principal gets mapped to the UID field in the LDAP registry.

Specifies the server identity that the application server uses to establish trust with the target server. The server identity can be sent using one of the following methods:

• A server ID and password when the server password is specified in the registry configuration.
• A server ID in a Lightweight Third Party Authentication (LTPA) token when the internal server ID is used.

Specifies an alternative user as the trusted identity that is sent to the target servers instead of sending the server identity.

This option is recommended for identity assertion. The identity is automatically trusted when it is sent within the same cell and does not need to be in the trusted identities list within the same cell. However, this identity must be in the registry of the target servers in an external cell, and the user ID must be on the trusted identities list or the identity is rejected during trust evaluation.

Specifies the trusted identity that is sent from the sending server to the receiving server.

If you specify an identity in this field, it can be selected on the panel for your configured user account repository. If you do not specify an identity, a Lightweight Third Party Authentication (LTPA) token is sent between the servers.

Specifies a semicolon-separated (;) or comma-separated (,) list of trusted server IDs, which are trusted to perform identity assertion to this server. For example, serverid1;serverid2;serverid3 or serverid1,serverid2,serverid3.

Use this list to decide whether a server is trusted. Even if the server is on the list, the sending server must still authenticate with the receiving server to accept the identity token of the sending server.

Specifies the password that is associated with the trusted identity.

Confirms the password that is associated with the trusted identity.

Specifies client-to-server authentication using Kerberos, LTPA or Basic authentication.

If you select Basic Authentication and LTPA, and the active authentication mechanism is LTPA, the server goes with a downstream server with a user name, password or LTPA token.

If you select Basic Authentication and KRB5, and the active authentication mechanism is KRB5, the server goes with a downstream server with a user name, password, Kerberos token or LTPA token.

If you do not select Basic Authentication, the server does not go with a downstream server with a user name and password.

Specifies whether the client processes connect to the server using one of the server-connected transports.

You can choose to use either SSL, TCP/IP, or Both as the outbound transport that a server supports. If you specify TCP/IP, the server supports only TCP/IP and cannot initiate SSL connections with downstream servers. If you specify SSL-supported, this server can initiate either TCP/IP or SSL connections. If you specify SSL-required, this server must use SSL to initiate connections to downstream servers. When you do specify SSL, decide which set of SSL configuration settings you want to use for the outbound configuration.

This decision determines which keyfile and trustfile to use for outbound connections to downstream servers.

Specifies a list of predefined SSL settings to choose from for inbound connection.

Information	Value
Data type:	String
Default:	DefaultSSLSettings
Default:	DefaultIIOPSSL
Range:	Any SSL settings configured in the SSL Configuration Repertoire

Specifies whether a client certificate from the configured keystore is used to authenticate to the server when the SSL connection is made between this server and a downstream server, provided that the downstream server supports client certificate authentication.

Typically, client certificate authentication has a higher performance than message layer authentication, but requires some additional setup. These additional steps include verifying that this server has a personal certificate and that the downstream server has the signer certificate of this server.

Specifies the type of system login configuration to use for inbound authentication.

You can add custom login modules by clicking SecurityGlobal security. From Authentication, click Java Authentication and Authorization ServiceSystem logins.

Select this option to enable stateful sessions, which are used mostly for performance improvements.

The first contact between a client and server must fully authenticate. However, all subsequent contacts with valid sessions reuse the security information. The client passes a context ID to the server, and the ID is used to look up the session. The context ID is scoped to the connection, which guarantees uniqueness. Whenever the security session is not valid and the authentication retry is enabled, which is the default, the client-side security interceptor invalidates the client-side session and submits the request again without user awareness. This situation might occur if the session does not exist on the server, for example, the server failed and resumed operation. When this value is disabled, every method invocation must authenticate again.

Specifies whether to limit the size of the CSIv2 session cache.

When you enable this option, you must set values for the Maximum cache size and Idle session timeout options. When you do not enable this option, the CSIv2 session cache is not limited.

In previous versions of the application server, you might have set this value as the com.ibm.websphere.security.util.csiv2SessionCacheLimitEnabled custom property. In this product version, it is advisable to set this value using this administrative console panel and not as a custom property.

Specify the maximum size of the session cache after which expired sessions are deleted from the cache.

Expired sessions are defined as sessions that are idle longer than the time that is specified in the Idle session timeout field. When you specify a value for the Maximum cache size field, consider setting its value between 100 and 1000 entries.

Consider specifying a value for this field if your environment uses Kerberos authentication and has a short clock skew for the configured key distribution center (KDC). In this scenario, a short clock skew is defined as less than 20 minutes. Consider increasing the value of this field if the small cache size causes the garbage collection to run so frequently that it impacts the performance of the application server.

In previous versions of the application server, you might have set this value as the com.ibm.websphere.security.util.csiv2SessionCacheMaxSize custom property. In this product version, it is advisable to set this value using this administrative console panel and not as a custom property.

This field only applies if you enable both the Stateful sessions and the Enable CSIv2 session cache limit options.

This property specifies the time in milliseconds that a CSIv2 session can remain idle before being deleted. The session is deleted if you select the Enable CSIv2 session cache limit option and the value of the Maximum cache size field is exceeded.

This timeout value only applies if you enable both the Stateful sessions and the Enable CSIv2 session cache limit options. Consider decreasing the value for this field if your environment uses Kerberos authentication and has a short clock skew for the configured key distribution center (KDC). In this scenario, a short clock skew is defined as less than 20 minutes. A small clock skew can result in a larger number of rejected CSIv2 sessions. However, with a smaller value for the Idle session timeout field, the application server can clean out these rejected sessions more frequently and potentially reduce the resource shortages.

In previous versions of WebSphere Application Server, you might have set this value as the com.ibm.websphere.security.util.csiv2SessionCacheIdleTime custom property. In this product version, it is advisable to set this value using this administrative console panel and not as a custom property. If you previously set it as a custom property, the value was set in milliseconds and converted on this administrative console panel to seconds. On this administrative console panel, you must specify the value in seconds.

Enables the use of custom Remote Method Invocation (RMI) outbound login modules.

The custom login module maps or completes other functions before the predefined RMI outbound call.

If the RMI/IIOP communication is across different realms, use this link to add outbound trusted realms.

The credential tokens are only sent to the realms that are trusted. In addition, the receiving server should trust this realm using the inbound trusted realms configuration to validate the LTPA token.