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In this field, you specify the external security system to be used.

Possible values are: RACF, ACF2 (= CA-ACF2), TOPS (= CA Top Secret) and SAF.

The default value is SAF: this means that only NSF Options which apply to all supported external security systems are evaluated, while those which are specific to a certain security system will be ignored.

This field is used to activate Natural SAF Security. Possible values are:

• 1 = Natural SAF Security is not active, and the SAF server is not accessed. Access to the Natural session is controlled by Natural Security.

• 2 = Natural SAF Security is active. Users must be defined in the external security system, and access to the Natural session is controlled by the SAF server. Within the session, Natural Security determines what users are allowed to do.

• 3 = Same as 2. However, if a user is not defined in the external security system, he/she must be defined in Natural Security - in which case access to the Natural session is controlled by Natural Security.

• 5 = Same as 1. In addition, the Natural SAF Security application programming interfaces are available for use, and their use is controlled by the SAF server.

This option determines whether the group ID defined in the external security system is to be used as value for the Natural system variable *GROUP (Y/N).

It is recommended that this option be set to "Y" (see also option NSC Group ID below).

This option determines whether the group IDs defined in the external security system also have to be defined in Natural Security (Y/N).

It is recommended that this option be set to "Y"; any conditions of use associated with the Natural Security group profile can then be controlled by Natural Security.

If there are multiple default groups in the external security system, instead of having to define all these groups in Natural Security, you can define one General Group ID (see below), which will be used by the Natural logon procedure for the logon of all users defined in the external security system.

RACF allows for a user to be in multiple groups. If this option is set to "Y", any of these groups can be used for a logon to a protected library, and they will be evaluated by the Natural logon procedure to select the group to be used for the logon.

This option determines whether the user name defined in the external security system is to be used as value for the Natural system variable *USER-NAME (Y/N).

This option determines whether, in addition to being defined in the external security system, users also have to be defined in Natural Security (Y/N).

If set to "Y", the Natural Security user profile will be used once the user has successfully logged on to the external security system. After the initial logon, the conditions of use associated with the Natural Security user profile will be controlled by Natural Security. However, Natural Security will not perform any password checks.

This option determines if and how ETIDs (end of transaction IDs) are to be generated by Natural SAF Security at the start of the Natural session:

• N = No ETIDs are generated by Natural SAF Security; they are generated by Natural Security.

• O = Generate ETIDs only for online users.

• B = Generate ETIDs only for batch-mode users.

• A = Generate ETIDs for all (online and batch-mode) users.

• J = Use the job name as ETID (for batch-mode users only).

• T = Use the value of the Natural system variable *INIT-ID as ETID.

This option controls users' access to private libraries:

• N = Access to private libraries is controlled by Natural Security.

• Y = When a user logs on without specifying a library ID, the current value of the Natural system variable *USER will be used as library ID. If the library option Protect Libraries (see below) is set, this requires a corresponding resource profile for this library.

• D = When a user logs on without specifying a library ID, the current value of the Natural system variable *USER will be used as library ID. If the library option Protect Libraries (see below) is set, this requires a corresponding resource profile for the value specified as Resource priv. lib. (see below). Access validation in the external security system will be based on this value (instead of the value of the system variable *USER).

If this option is set to a value other than "N", the library option Protect Libraries (see below) must also be set to a value other than "N".

Only applicable if NSC Logon Priv. Library (see above) is set to "D": In this field, you specify the value which is to be used for access validation to private libraries. This value applies to all users.

The default value is the string *USER.

When Automatic Logon is used (Natural profile parameter AUTO=ON), Natural uses the value of the Natural system variable *INIT-USER as value for the Natural system variable *USER. To prevent this, you can use this option.

• Y = The *INIT-USER value is not used for *USER.

• N = The *INIT-USER value is used for *USER (this is the default).

This option is relevant if the external security system is set to distinguish between lower-case and upper-case characters in user passwords. It determines whether or not this distinction is to be made by Natural SAF Security as well:

• N = Natural SAF Security internally converts all alphabetical characters in passwords to upper-case.

• Y = Natural SAF Security distinguishes between lower- and upper-case characters in passwords.

If you set this option to "Y", the option Password Case-Sensitive in Natural Security's Library and User Preset Values is automatically set to "Y" as well to ensure consistent password checking.

If you set this option to "Y", make sure that any password input fields used also distinguish between lower- and upper-case. This may affect the logon screen, the user exit LOGONEX1, any logon-related Natural Security application programming interfaces, or Natural's RPC-logon-related application programming interfaces.

This option is useful if there are multiple default groups in the external security system and you do not wish to define all these groups in Natural Security. In this field, you can specify the ID of a group defined in Natural Security. For the Natural logon procedure, this group ID will be used instead of a default group ID: This means that the security profile of this group applies to all users defined in the external security system.

If a group ID is specified in this field, the options NSF *GROUP and NSC Group ID (see above) must both be set to "Y".

This option allows you to change user passwords in RACF user profiles, with the base segment field keyword EXPIRED, from within Natural Security's user maintenance.

Before this option can be used, the subprogram NSFRACF1, whose source is supplied in the library SYSSEC, has to be cataloged in SYSSEC under the name NSCNRACF. The source is made available for you to see its highly sensitive functioning. You need not make any changes to it, but can catalog it as it is. If necessary, however, you may adjust it to suit your requirements.

Using this option/subprogram requires that in RACF you have the appropriate authorizations. That is, you can only set the RACF user passwords and EXPIRED base segment field keywords via Natural Security if you are allowed to do so in RACF itself.

Setting this option to "Y" causes the following changes on Natural Security user profile screens:

• Instead of the user name as defined in Natural Security, the user name as defined in the RACF user profile is displayed.

• Instead of the fields New Password and Change After nnn Days, the field RACF Password is displayed. If you enter a password in that field, this will cause the user's password as defined in the RACF user profile to be changed accordingly.

To set the Natural Security user password, you press PF9.

Setting this option to "X" has the same effects as "Y". In addition, it causes a check to be performed as to which user IDs defined in Natural Security are also defined in RACF. As a result, the user IDs defined in both systems will be marked accordingly on Natural Security's User Maintenance selection list.

This option determines whether the environment profile of the system-file combination (FNAT, FUSER, FDIC, FSEC) is to be checked at the logon (Y/N).

• Y = The access level defined for the environment in the external security system determines whether a user has access to it or not.

• N = Users have access to any environment.

See also Environment Profiles below.

This option determines whether undefined system-file combinations are to be accepted at the logon (Y/N).

This option is only relevant if RACF is used as external security system. With other external security systems, it will be ignored.

This option determines whether the library access level is to be checked via the SAF server:

• Y = To log on to a library, users need at least READ access to the library and all steplibs defined for that library.

• L = To log on to a library, users need at least READ access to the library (but not to the steplibs).

• R = If RACF is used as external security system, you can set this option to "R": The library access level will be checked, but access to libraries not defined in RACF will also be possible. The access level of the library and its steplibs will be checked.

• * = This is the same as "R", except that only the access level of the library itself (but not of the steplibs) will be checked.

• N = Access to libraries is controlled by Natural Security according to the Natural Security logon rules.

"R" and "*" only apply with RACF. For other security systems, they are not possible.

If this option is set to a value other than "N", the user option NSC Logon Priv. Library (see above) must also be set to a value other than "N".

This option determines whether the environment alias is to be used as prefix of the resource library for the access-level check (Y/N).

See also Environment Profiles below.

This option determines whether the use of Natural system commands is to be controlled by the access level (Y/N).

If this option is set to "Y", the access level determines whether the use of Natural system commands is allowed:

• If the access level is CONTROL or higher, the use of system commands is allowed.

• if the access level is lower than CONTROL, the use of system commands is not allowed.

If this option is set to "Y", the Natural profile parameter NC as well as any settings concerning system commands in Natural Security library profiles (Allow System Commands, Command Restrictions and Editing Restrictions) will be ignored.

This option determines whether read-only access to the FUSER system file is to be controlled by the access level (Y/N).

If this option is set to "Y", the access level determines whether modifications of the data on the FUSER system file are allowed:

• If the access level is ALTER, modifications on the FUSER file are allowed. This requires the definition of a Natural scratch-pad file (as described in the Natural Operations documentation for mainframes).

• If the access level is lower than ALTER, modifications on the FUSER file are not allowed.

If this option is set to "Y", the RO option of the Natural profile parameter FUSER is ignored.

This option determines whether the execution of Natural programming objects is to be controlled by the external security system:

• Y = It is checked whether a programming object may be executed for the current library (as determined by the Natural system variable *LIBRARY-ID).

• X = It is checked whether a programming object may be executed in the library in which it is stored.

• N = Execution permission is controlled by the Natural Security library profile containing the programming object.

An example of the effects of this option is shown under Programming Objects > Natural SAF Security Definitions.

The use of this option requires that certain Natural profile parameters be set; see Step 2 of the Natural SAF Security installation procedure.

This option determines if the Natural RPC service access is to be checked via the SAF server (N/Y/F):

• N = Access to a service is controlled by the Natural Security library profile of the library containing the subprogram.

• Y = Access to a service is controlled by the resource profile. Users need at least READ access to execute a service. In addition, the library profile of the library containing the subprogram applies. Access to services not defined in RACF is also possible.

• F = This is the same as "Y", except that access to services not defined in RACF is not possible.

"Y" and "F" are only different for RACF; for other security systems, "F" has the same effect as "Y".

This option determines whether the environment alias is to be used for the service-access check (Y/N).

See also Environment Profiles below.

This option determines whether the environment alias is to be used as prefix to the resource definitions (Y/N).

See also Environment Profiles below.

This option determines whether access to undefined resources is to be allowed via the Natural SAF Security application programming interfaces (Y/N).

This option is only relevant if RACF is used as the external security system. With other external security systems, this option will be ignored.