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From viola lu <>
Subject Re: Question about Security (Credentials) for database connections(connector)
Date Wed, 10 Aug 2011 08:47:25 GMT
Hi, David:

  1. If container-managed security is implemented, but how to configure it
for connector?

  2. Now one customer doesn't want to use same db id but different user
credentials as below, container-managed security can meet this requirement?

  "Configure a geronimo Instance running in a windows domain with a db2
datasource, which connects to the iseries using kerberos.
In order for this to work with any kind of success, we believe we need to
configure some kind of connection reauthentication.  If geronimo
does not invoke connection reauthentication, then any connection pool would
quickly fill up with connections per individual user.
Ultimately this would negate any benefit of connection pooling. connection
reauthentication would allow geronimo to assert the
current callers identity onto the running connection."

"Our ultimate goal here is to configure End To End single signon from a
windows browser, through geronimo, and onto the System i.  Whereby
the clients identity is preserved throughout."

 3. Based on the above requirement, *datasource connects to iseries using
kerberos*, currently tranql-ra/ra.xml, set authentication-mechanism as
basicpassword, if datasource uses kerberos, should we change authentication
mechanism to *Kerbv5 as below? *
                <description>Uses JDBC user/password authentication based on
properties supplied to connect</description>



And <reauthentication-support>false</reauthentication-support> should change
to true support connection reauthentication. And in our geronimo-connector
should handle this connection reauthentication ? Also database pool in
console should support these configuration?

it provides a datastorehelper interface to end-users for db connection
reauthentication function, for example, db2
end-user can implement its doConnectionPerTransation method by using db2
api: resetDB2Connection, same way can be used in geronimo? I am not sure
connection-reauthentication is necessary or good way if different users
filled up connection pool.

On Wed, Aug 10, 2011 at 1:15 PM, David Jencks <>wrote:

> Hi Viola,
> The docs are correct and we implement everything it says we do.  However
> except in unusual circumstances it doesn't make a lot of sense to use
> container managed security.  I think perhaps you are getting confused by the
> name.  In any of these scenarios, the ManagedConnectionFactory has to be
> consulted about the credentials, and presumably it will consult the actual
> resource manager (e.g. database server).  The "container managed" is about
> where the credentials come from.
> Usually with a database you want all the connections as the same user.  In
> this case you might as well configure the user and password as mcf
> properties and be done with it.  This is sort of "unmanaged non-application"
> security.
> Application managed security means (for jdbc) that the application will
> call ds.getConnection(user,pw).
> Container managed security means that the container will take the users
> identity (and possibly credentials) and somehow derive the credentials
> needed by the mcf/database from it.  For instance you could use the users
> name and pw to log into the db, or you could use some role they are in to
> derive the user name/pw (e.g. each role gets a different database user), or
> you could come up with some other scheme.  However, usually people don't
> want to do this, they just want everyone to have the same db id, so it
> doesn't make a lot of sense to set up a mapping that maps everyone to the
> same credentials.
> Is this clearer?
> I implemented the inbound security stuff so we should consider updating the
> docs for 3.0.  Perhaps the excerpt below can be made clearer so people other
> than me can understand it :-\
> thanks
> david jencks
> On Aug 9, 2011, at 9:47 PM, viola lu wrote:
> Hi, Dev:
>  From geronimo 2.1 doc:
>  Security (Credentials)
> In the J2CA 1.5 spec security considerations are confined to providing the
> credentials for outbound connections. There is no provision for credential
> inflow for inbound messaging. This hole is being addressed in the next spec
> revision.
> There are three possible sources for credentials for outbound connections:
>    1. ManagedConnectionFactory configuration. Most
>    ManagedConnectionFactory implementations include user and password
>    config-properties. In the absence of other credentials these are used to
>    authenticate to the resource manager. The values of these properties are
>    generally difficult to conceal securely as they are in some geronimo
>    configuration files on disk and need to be accessible to geronimo in order
>    to create connections. However, this is by far the most frequently used
>    option. This will result in all work in your e.g. database being done by the
>    same user, which basically represents the identity of the geronimo server.
>    2. Application managed security. Many connection factories such as
>    DataSource provide a way to request connections with a particular security
>    context, such as dataSource.getConnection(user, password). This requires
>    your app to have detailed knowledge of the credentials needed which is
>    rarely appropriate.
>    3. *Container managed security.* With this scheme you deploy a
>    LoginModule specific to the connector you are using that installs suitable
>    credentials into the Subject on login. When a connection is requested these
>    credentials are extracted from the Subject and used in obtaining the
>    connection. A wide variety of schemes can be used here including
>    - Fixed credentials. Every subject gets the same credentials. This has
>    the same effect as the default credentials scheme except that the
>    credentials may be stored in an external more secure location more easily.
>    - *User credentials. The credentials are the user and password of the
>    user themselves. In this case the work will be done in the resource manager
>    (database) as the user themselves. Unless the connector supports
>    reauthentication (changing the user on an existing connection) this will
>    prevent effective connection pooling.*
>    - Mapped credentials. The credentials for the resource manager are
>    determined from the user identity. For instance the resource manager user
>    could depend on the user being a member of a particular enterprise role or
>    group. In this case without reauthentication support connection pooling
>    should be set up so each resource manager user gets a separate pool.
> Seems there is Container Managed Security function in security part of
> connector, i  checked the code, currently, we all use ManagedConnectionFactory
> to do security authentication. not container-managed security. So the
> feature of user credetials of container managed security. And if we plan to
> implement this function, any suggestion of tech details of
> geronimo-connector module change?
> Appreciate your help!
> --
> viola
> Apache Geronimo


Apache Geronimo

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