Question about APEX_PUBLIC_USER

I don't know how to set the authentication scheme"for our Apex application correctly.

Our applications Apex starts from a java application or a Web Forms application. For the java application or Webforms-request a correct connection has been made. Thus, a new connection to an Apex application name is unnecessary. That's why we chose the authentication scheme '(no authentication (with the help of DAD)) database'. The user can start an application Apex for example of Web forms, without an additional connection.
In the DAD we defined for the connection to the database from the user "APEX_PUBLIC_USER"! The Apex application works very well.

When an apex application is started, the application knows the user logged into the Web Forms. The user (webforms) will appear in the application of the apex, because we put the user as "wwv_flow.g_user: =: username".
Hollow of the user (=: username) control us access to the data manipulations or pages apex (= MEV). So, when you look at enforcement apex that you think, it is a public application, but it's not!

Our problem is that the application of the apex get no session number (-> "Session-Nr. = 0"). I think that this situation is the cause of our problems:
(1.) the user cannot save reports (interactive) (= > menue save is hide)
(2.) a user can copy the url of a pc to pc anothere (= browser)

I changed the application "public user" property of "APEX_PUBLIC_USER" to another value = > I always get the session nr "0". Only when I changed the user APEX_PUBLIC_USER in the DADS.conf to another user, the apex application works without these problems!

Is there a way to authenticate our apex application correctly?
Should I change the user (= APEX_PUBLIC_USER) in the DAD?
Why the "public user" applicaton property exist?

concerning
Robert

Hi Robert,.

APEX has not yet copied the URL of the item value in the element of your application using the Sentinel and invalid session procedures. The APEX_APPLICATION package has overall tables g_arg_names and g_arg_values that contain these values, however. You can use them to get the TOKEN value in the invalid session procedure. The globals are not documented and not officially supported, but we currently have no plans to remove them. You can also use owa_util.get_cgi_env ('QUERY_STRING') to analyze the parameters of f? p, if the use of variables not supported is about you.

Forms and Java should put the correct session id in the query, to join the existing sessions rather than create new ones. Here is how I could do this. You probably already have a sessions table that is shared between APEX and forms:

create table MY_SESSIONS (
    id number,
    apex_session number,
    java_session number,
    token number,
    token_valid_until date,
    created_at date not null,
    constraint MY_SESSIONS_PK primary key(id),
    constraint MY_SESSIONS_UQ_APEX_SESSION unique(apex_session),
    constraint MY_SESSIONS_UQ_TOKEN unique(token)
);

Startup forms, you put something like this in WHEN-NEW - EXAMPLE of the first form of FORM, create a new entry:

insert into MY_SESSIONS ( id, created_at )
values ( sys.dbms_crypto.randomnumber, sysdate )
returning id into :global.my_session_id;

When forms creates a link to the APEX, it uses a kind of code like this:

declare
    l_app number := 12345;
    l_page number := 42;
    l_token number := sys.dbms_crypto.randomnumber;
    l_url varchar2(4000) := 'https://host:port/apex/f?p=';
begin
    for i in ( select rowid, apex_session from MY_SESSIONS where id = :global.my_session_id for update nowait ) loop
        update MY_SESSIONS set
            token=l_token,
            token_valid_until=sysdate+1/24/3600
        where rowid = i.rowid;
        commit;
        web.show_document (
            'https://host:port/apex/f?p='||
            l_app||':'||
            l_page||':'||
            nvl(i.apex_session,0)||'::::TOKEN,P42_OTHERDATA:'||
            l_token||',4711' );
    end loop;
end;

On the 1st request, APEX will not get a session id again. The Sentinel fails and calls the procedure of invalid session. This verifies the token and success updates MY_SESSIONS with the new session id:

declare
    l_my_session MY_SESSIONS%rowtype;
begin
    -- read token
    for i in 1 .. apex_application.g_arg_names.count loop
        if apex_application.g_arg_names(i) = 'TOKEN' then
            select *
            into l_my_session
            from MY_SESSIONS
            where token = apex_application.g_arg_values(i)
            for update nowait;
            exit;
        end if;
    end loop;
    -- verify token and store session id for next requests
    if l_my_session.token_valid_until >= sysdate then
        update MY_SESSIONS set
            apex_session=apex_custom_auth.get_session_id,
            token = null,
            token_valid_until = null
        where id = l_my_session.id;
        commit;
    else
        raise no_data_found;
    end if;
exception when no_data_found then
    ... redirect to some error page or an APEX login page
end;

All subsequent applications that come in shapes will already have the correct session id and are not still must pass the TOKEN variable, as the Sentinel already accepts the session.

This is just a very rough sketch and probably has bugs, I did not test this. For example, you can add code that prevents the unrest in dup_val_on_index because of the existing of identifiers. I would also consider to implement this as a plug-in authentication instead of a custom authentication scheme.

Kind regards
Christian

Published by: Christian Neumueller on May 14, 2013 10:36
update fixed link block generation

Tags: Database

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