************ Club Tech iSeries Programming Tips Newsletter ***********
An iSeries Network Publication http://www.iseriesnetwork.com
Home of iSeries NEWS Magazine Editor: Scott Klement
Issue 193 January 20, 2005
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THIS WEEK:
> APIs By Example: Profile Authorization Management
Pro and Pro VIP Edition Items:
> Speeding Up Eclipse/WDSC
> Consistent Error Handling, Part 1: Defining the PSDS
1. APIs BY EXAMPLE: PROFILE AUTHORIZATION MANAGEMENT
In the previous installment of APIs by Example, I presented the
Override Group Profile (OVRGRPPRF) command, which enables a temporary
change of a job's current group profile. To control when and for how
long to make the OVRGRPPRF command available, the command includes an
authorization code parameter that is to be requested from a security
administrator.
To allow a security administrator to issue an authorization code, the
Add Profile Authorization Code (ADDPRFAUT) command is provided, and
with this week's version of the OVRGRPPRF command, no user will be
able to run that command without an authorization code.
The new version of the OVRGRPPRF command further addresses two issues
that emerged after publication:
a) At security level 40 and above, the command's "hidden" profile
token parameter would be passed by value the first time the OVRGRPPRF
command was run in a job, causing the command to fail. (However, any
further attempts would succeed.) The passing of the profile token
parameter has been changed and is now performed by means of a
temporary user space.
b) In the event that the OVRGRPPRF command was run by a user profile
that had OWNER(*GRPPRF) specified, the system would not allow a change
of the effective group profile, so the command would fail.
By temporarily adding the original group profile to the current job's
array of supplemental groups, it was possible to address this problem
on systems running V5R2 or later. (Thank you Jean-Marie Sauvageot for
reporting these issues.)
Now back to the ADDPRFAUT command. The command's prompt panel follows:
A short explanation of the command's parameters follows. Please refer
to the command's help text for further details:
User profile:
The user profile being authorized to perform a temporary
group profile override.
Group profile:
The group profile that the specified user profile is
authorized to override its current group profile to.
Authorization code:
The authorization code that should be entered in the
OVRGRPPRF command to allow the group profile override to take
place. By default the authorization code is capitalized.
Reason:
A brief explanation of the reason for the group profile
override. This information will also be recorded in an
audit journal entry.
Valid time:
Specifies the number of minutes that the authorization code
will be valid, counting from the time it is created.
Replace authorization code:
If an authorization code already exists for the specified user
profile and group profile, the ADDPRFAUT command will fail
unless this parameter is set to *YES. In the event that an
authorization code has expired, this setting also allows you
to renew that authorization code.
The ADDPRFAUT command writes audit journal entries to the system audit
journal, QAUDJRN. It documents both initiation and termination of the
command. The audit entries will have journal code 'U'. The entry type
for initial profile authorization is 'A0' and the entry type for exit
profile authorization is 'A1'. The data structures JrnEntA0 and
JrnEntA1 in the sources CBX1291V and CBX1291, respectively, document
the layout of the two journal entry formats.
As I mentioned last time, the core of this utility is a validation
list object that is used to store the authorization codes and the
authorization codes' expiration timestamps. Validation lists are
managed by a set of APIs, which come in two flavors: One for ILE
programs, and one for OPM programs. To call these APIs, some complex
data structures have to be employed.
V5R1 of ILE RPG brought the new keywords LikeDs and Inz(*LikeDs),
which made it possible to define a data structure with the same format
as another data structure and, at the same time, initialize the new
data structure with the same values specified in the "template" data
structure.
V5R2 enhanced this ability further by allowing you to specify these
keywords on a subfield of a data structure. This way, you could have
one data structure be part of another. In other words, the "Chinese
box" data structure became possible.
Prior to these enhancements, it was not possible to code an exact
match of the data structures as they are specified in the
documentation. It was possible to perform a successful call to the
API, but the flexibility provided by the data structures was lost.
For example, take a look at the Add Validation List Entry API
parameter data structure that specifies the entry's attribute data,
Qsy_Attr_Info_T. It's defined by three subfields:
**-- Validation list attribute data:
A-> D Qsy_Attr_Info_T...
D Ds Qualified
D Number_Attrs 10i 0 Inz( 1 )
D Res_align 12a
B-> D Attr_Descr LikeDs(Qsy_Attr_Descr_T)
C-> D Inz( *LikeDs )
The third parameter, Attr_Descr, is defined by the LikeDs to have the
same format as the template data structure called Qsy_Attr_Descr_T
(B). The many subfield initializations in the template data structure
are propagated to the Attr_Descr parameter with the Inz( *LikeDs )
keyword (C). The following code snippet shows these initializations:
D Qsy_Attr_Descr_T...
D Ds Qualified
D Attr_Location 10i 0 Inz( QSY_IN_VLDL )
D Attr_Type 10i 0 Inz( QSY_SYSTEM_ATTR )
D Attr_Res 8a Inz( *Allx'00' )
F-> D Attr_ID_p *
D Attr_Other_Descr...
D 32a Inz( *Allx'00' )
D Attr_Data_Info...
D 96a
D-> D Attr_VLDL LikeDs(Qsy_In_VLDL_T )
D Overlay(Attr_Data_Info: 1)
E-> D Inz( *LikeDs )
D Attr_In_Other...
D 96a Overlay(Attr_Data_Info:1)
D 64a Overlay(Attr_In_Other:33)
D Inz( *Allx'00' )
D Attr_Other_Data...
D 32a Inz( *Allx'00' )
The Qsy_Attr_Descr_T data structure again contains an embedded data
structure, Attr_VLDL. This data structure is, in turn, defined by the
template data structure Qsy_In_VLDL_T (D). The Attr_VLDL data
structure is initialized with the values from the template data
structure using the Inz( *LikeDs ) keyword (E). The following code is
where those initializations take place:
D Qsy_In_VLDL_T Ds Qualified
D Attr_CCSID 10i 0 Inz( -1 )
G-> D Attr_Len 10i 0 Inz( 1 )
D Attr_Res_1 8a Inz( *Allx'00' )
H-> D Attr_Value_p *
**-- Qsy_Attr_Descr_T structure constants:
D QSY_IN_VLDL c 0
D QSY_SYSTEM_ATTR...
D c 0
**-- Qsy_In_VLDL_T structure parameter:
D Qsy_Vfy_Only s 1a Inz( '0' )
Reset Qsy_Entry_ID_Info_T;
In the code, the complex data structures' subfields are referred to by
specifying their qualified name:
The use of functionality requires V5R2 or later, which of course means
that the profile authorization utility also requires V5R2 or later. In
the event that you need to compile this utility to V5R1, you can find
an example of how to code the validation list data structures for
earlier releases at the following link:
http://www.iseriesnetwork.com/resources/artarchive/index.cfm?fuseaction=...
Or you can contact me at the e-mail address specified below, and I'll
try to help you out.
Finally, to let you easily verify and remove authorization codes, the
Manage Profile Authorization (MNGPRFAUT) command is also provided:
If you run the MNGPRFAUT command, specifying OPTION(*VERIFY), a
message is returned specifying the following information:
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Additional Message Information
Message ID . . . : CBX0001 Severity . . . . . . : 00
Message type . . : Information
Date sent . . . : 09-01-05 Time sent . . . . . : 15:06:12
Message . . . . : User profile JMS authorization code to group
profile QSECOFR verified.
The following authorization code attributes were returned:
Creation date . . . . . . : 08-01-05 17:48:58
Last verification date . . : 08-01-05 17:49:00
Invalid password count . . : 0
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Specifying OPTION(*REMOVE) physically removes the authorization code
from the utility validation list.
As always, please refer to the command's help text for further
details.
To offer a single entry point for all three profile authorization
commands, I have further included a UIM menu.
Running the command GO PRFAUT will take you to the following panel:
You will only see the menu options that your user profile is actually
authorized to, as defined by the object authorization of each command
associated with the individual menu options.
Help text is also available for the menu at global, option, and F-key
levels.
In the following section, you will find a specification of the sources
involved in the profile authorization utility, as well as instructions
on how to create and configure all the utility objects:
The OVRGRPPRF command includes the following sources:
CBX128 -- Command processing program that performs the group
profile override.
CBX128V -- Validity checking program that performs integrity and
access control.
CBX128H -- Command help text panel group.
CBX128X -- Command definition source member.
CBX128M -- Creates and configures all command objects.
The ADDPRFAUT command includes the following sources:
CBX1291 -- Command processing program stores the profile
authorization code in a validation list.
CBX1291V -- Validity checking program that performs integrity and
access control.
CBX1291H -- Command help text panel group.
CBX1291X -- Command definition source member.
CBX1291M -- Creates and configures all command objects.
The MNGPRFAUT command includes the following sources:
CBX1292 -- Command processing program that performs the group
profile override.
CBX1292V -- Validity checking program that performs integrity and
access control.
CBX1292H -- Command help text panel group.
CBX1292X -- Command definition source member.
CBX1292M -- Creates and configures all command objects.
The PRFAUT menu includes the following source:
CBX129 -- The UIM menu source member.
Once all the above-specified source members have been copied to their
default source files and the program CBX128M has been compiled,
calling CBX128M will create all necessary command objects. Specify the
source file library as the only parameter. All the command objects
will be created in that library as well.
