This section describes the rules which apply when a user logs on to Natural under Natural Security. It covers the following topics:
Note:
If a user invokes Natural under Natural Security and the FNAT
system file specified in the parameter file/module used is a non-Security
system file, Natural cannot be started, and the user will receive an
appropriate error message.
The logon procedure is used by Natural Security to ensure that the user who is logging on to Natural is authorized for the library requested.
A logon must be executed successfully before any Natural session can be started.
A logon screen (on mainframe computers and Linux) or logon dialog box (under Windows) is provided for the user to enter the information required for the logon.
When Natural Security is installed, the Natural Security logon screen will be displayed whenever a user invokes Natural.
Under Windows, the logon screen is displayed as a dialog box (for the sake of consistency, however, it will also be referred to as "logon screen").
The logon screen requests the user to enter the following:
| Field | Explanation |
|---|---|
| Library ID |
The ID of the library to be used. To determine which libraries are available, the user may enter his/her user ID in the user ID field and an asterisk (*) in the library ID field: a list of all libraries available to the user will be displayed. The list contains all non-protected libraries and all protected libraries to which the user is linked (either directly, or via a group whose security profile is activated). The list also contains all libraries available to the user's terminal (if the terminal is defined to Natural Security. To view a list of all libraries available to the terminal, the user may enter an asterisk (*) in the library ID field without entering a user ID.) Note: |
| User ID |
The ID by which the user is defined to Natural Security. The ID of a group must not be entered. A terminal ID must not be entered either. If a user ID is entered, a password must also be entered. If no user ID is entered, no password is required. If no user ID is entered, Natural Security will use the ID of the terminal being used. In this case the terminal has to be defined to Natural Security; otherwise the logon will be rejected. |
| Password |
The password specified in the user's security profile. If no password has been specified in the user's security profile, the password will be identical to the user ID (when a newly defined user logs on for the first time and the password is identical to the user ID, the user must change his/her password by entering a new password in the New Password field). |
| New Password |
A new password can only be entered in this field, if a valid password is entered in the Password field. If a valid password has been entered in the Password field and the user wishes/has to change that password, the user enters a new password in this field. This new password then replaces the old one and will from then on be the valid password for the user. Note: |
By default, Natural Security uses "regular" passwords of up to 8 characters. However, it also supports the use of password phrases, that is, passwords which are longer than 8 characters. The use of password phrases is activated by the option Password phrases active in the User Preset Values section of Administrator Services.
Unless otherwise stated, the term password in the Natural Security documentation applies to passwords of any length.
In a user's security profile, a Natural Security administrator may set or change the user's password. The administrator may also set a time interval, after which the user will be forced to change his/her password when logging on. See New Password and Change after nnn days in Components of a User Profile.
If a user has forgotten his/her password, he/she has to contact the Natural Security administrator, who then specifies a new password in the user's security profile. This will then be the valid password for the user (which he/she may change again in the logon screen).
Several rules can be applied to the usage of passwords. For this purpose, various options are available in the User Preset Values section of Administrator Services.
A logon to a library will be rejected if:
the user is not defined to Natural Security;
the user's security profile is currently inactive (due to Activation Dates settings);
the user is defined as user type "Member" and has not been assigned to a group;
the user is defined as user type "Member", and the security profile of the group to which he/she is assigned is currently inactive (due to Activation Dates settings);
the library is not defined to Natural Security;
the time window restrictions defined in the library's security profile do not permit use of the library at the time of the logon;
the library is protected and the user is not linked to the library;
the library is protected and the user is linked to it, but the link has been temporarily locked;
the library is protected, and the group via which the user is linked to the library is currently inactive (due to Activation Dates settings in the group security profile);
a non-existent startup transaction is specified in the library's security profile;
the NEXT/MORE line is not allowed nor a startup transaction specified in the library's security profile.
If no library ID is entered in the logon screen, the default library specified in the user's security profile will be invoked.
If no default library is specified in the user's security profile, the Privileged Groups specified in the user's security profile will be checked (in order of entry) for a default library.
If none of the Privileged Groups has a default library either, the user's private library will be invoked.
If neither default libraries nor a private library exist, the user must enter a library ID when he/she logs on.
If RESTART is entered as the library ID, the last
RESTARTable library to which the user was logged on will be invoked (for
details on the "RESTART" option, see
Transactions in
the section Components of a Library Profile).
Note:
The ID of the last RESTARTable library to which a user was
logged on is shown in the field Last Library in the user
security profile.
If FIN is entered as the library ID, the Natural
session will be terminated.
After a successful logon to a library, the startup transaction specified in the library's security profile is invoked. If no startup transaction is specified there, the Natural main menu is invoked.
Note:
Internally, Natural Security performs an END OF
TRANSACTION statement after a successful logon if any of the following
applies:
the user's password has been changed during the logon procedure;
a logon error has occurred during the logon procedure;
the Logon recorded option in the user's or the library's security profile is set to "Y";
the Restart option in the library profile is set to "Y";
the general option Lock User Option in Administrator Services is set to"X".
If the first logon to a library at the beginning of a Natural
session was successful, a user may change from one library to another by using
the Natural system command LOGON.
See also the Natural System Commands
documentation for information on the LOGON system
command.
The LOGON command takes the following
parameters:
If no parameter is specified, the default library will be invoked (either the user's or one of the privileged group's); if no default library is specified, the Natural Security logon screen will be invoked. For example:
LOGON
If one parameter is specified, it will be interpreted as a library ID. For example:
LOGON LIBX
LOGON *
If two parameters are specified, the first will be interpreted as a user ID, the second as a password. For example:
LOGON USERX PASSWX
If three parameters are specified, the first will be interpreted as a library ID, the second as a user ID, the third as a password. For example:
LOGON LIBX USERX PASSWX
If four parameters are specified, the first will be interpreted as a library ID, the second as a user ID, the third as a password, the fourth as a new password. For example:
LOGON LIBX USERX PASSWX NEWPASSX
If an error is detected during logon processing, Natural Security will display an error message.
If the LOGON command has been issued
from a library, Natural Security will invoke the error transaction defined for
that library. If no error transaction is defined, the logon screen will be
invoked.
Users would normally have to log on twice, first to the operating
system and second to Natural. To eliminate the need for a second logon, you may
set the Natural profile parameter AUTO to AUTO=ON
(see Natural Parameter Reference documentation).
As a result, an internal Natural Security logon procedure will be
invoked, which uses the operating-system login name (as contained in the
Natural system variable *INIT-USER) as the user ID, but no
password (on the assumption that this has been verified by the operating-system
logon procedure). The Natural Security logon screen will be suppressed. A logon
with a user ID other than the operating-system login name will not be
possible.
If AUTO=ON is used, the user has no possibility of
specifying a library ID. The library to which the user will be logged on is
determined by the same rules as described under
Logon Without Library
ID above. This means that automatic logon is only possible
if a default library is specified (for the user or one of his/her Privileged
Groups) or the user has a private library.
If you combine AUTO=ON with specifying a default
library in a user's security profile and with specifying a startup transaction
for that library, the user will receive the first screen of the default library
immediately after invoking Natural without having to pass any intermediate
screens (default libraries are described under
Components of a User
Profile in the section User
Maintenance, startup transactions under
Transactions in
the section Library Maintenance).
If AUTO=ON is set, the system command
LOGOFF has the same result as the system command
FIN (see
How to End a Natural
Session below).
If AUTO=ON is set, and after the initial automatic
logon the user tries to log on to another library and causes a logon error, the
error transaction for the current library will be invoked. If no error
transaction is specified, an error message will be issued and then the startup
transaction (if specified) for the current library will be invoked.
Note:
With Natural Single Point of Development, the user must always
specify his/her user ID and password in the Map Environment dialog, even if
AUTO=ON is set.
This section describes the options available for logon customization:
You can change the layout of the logon screen / dialog box to suit your requirements.
By default, the logon screen / dialog box is invoked by the user
exit LOGONEX1.
The source code of the logon screen is the map
NOGONM1,which is provided in the library SYSSEC.
To customize the logon screen:
Make a copy of NOGONM1 and store it under the
name LOGONM1.
Modify LOGONM1 to suit your requirements, and
catalog it.
Copy the cataloged object LOGONM1 into the
library SYSLIB.
Should LOGONM1 be missing from SYSLIB,
the Natural Security installation procedure will automatically copy the object
module NOGONM1 from SYSSEC to SYSLIB and
store it there under the name LOGONM1. This ensures that a default
logon screen is always present if no customized one is used.
For the logon dialog box on Windows, the customization procedure is the same as described above - except that the source/object names are different; see table below.
If the option Password phrases active in
User Preset
Values is set to "Y" or "A", the logon screen / dialog box
is invoked by the user exit LOGONEX0 instead of
LOGONEX1. The customization procedure is the same as described
above - except that the source/object names are different; see table below.
If the Authentication Type is set to "LDAP"
in the LDAP security
profile, the logon screen / dialog box is invoked by the user exit
LOGONSX1 instead of LOGONEX1. The customization
procedure is the same as described above - except that the source/object names
are different; see table below.
| Logon Screen / Dialog Box Invoked by User Exit | Source in Library SYSSEC | Object in Library SYSLIB |
|---|---|---|
LOGONEX1 |
NOGONM1 (map)
|
LOGONM1
|
GNOGONM1 (dialog
box)
|
GLOGONM1 |
|
LOGONEX0 |
NOGONMX1 (map)
|
LOGONMX1 |
GNOGONMX1 (dialog
box)
|
GLOGONMX1 |
|
LOGONSX1 |
NOGONSM1 (map)
|
LOGONSM1 |
GNOGONS1 (dialog
box)
|
GLOGONS1 |
In addition to those mentioned above, Natural Security provides several other user exits which may be used to customize the logon procedure. See Logon-Related User Exits.
Natural Security provides several application programming interfaces (APIs) which can be used for access verification and user authentication. See Application Programming Interfaces.
The following Natural system commands may be used to end a Natural session under Natural Security:
| Command | Explanation |
|---|---|
LOGOFF |
This command terminates a Natural session and invokes
the logon screen. To leave the logon screen, you enter FIN as the
library ID.
If the profile parameter |
LOGON (without parameters) |
This command terminates a Natural session and starts
the logon procedure, invoking either a default library or the logon screen (if
no default library is defined).
See also Automatic Logon above. |
FIN
|
This command terminates a Natural session and is used to leave Natural altogether. |
 |
Warning: Natural Security cannot protect your Natural environment against unauthorized use if Natural users leave their terminals unattended whilst being logged on to Natural. Therefore, users should be reminded to use the LOGOFF command before they leave their terminal.
Unauthorized persons will then be confronted with the Natural Security logon
screen and may only use what has been defined for them to use under Natural
Security. |
In library security profiles, you can specify a non-activity time limit, after which a logoff will be executed automatically.