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From Borut Hadžialić <borut.hadzia...@gmail.com>
Subject Re: Tomcat NTLM Authentication
Date Mon, 07 Mar 2011 09:55:41 GMT
Hi Hila,

I have a similar requirement in my current project. End users (using
browsers and java desktop apps) which work on windows workstations
which are in a domain, must be able to log in the application without
needing to type in username and password (using their windows
credentials). Additionaly, the connection to the underlying database
must also be done using those user credentials.

My steps while implementing this were:
1. Implement authentication (browser->server, desktop app -> server)
which uses kerberos
2. Enable credential delegation so your app server can impersonate
client when connecting to the database
3. Connect to the database as the client from within app server
code/process (this is database-specific)

This is how I solved it:
I use SPNEGO for browser/webapp scenario authentication. These
materials helped me come up with a working server side SPNEGO
implementation:

This is what I ended up using for reading a SPNEGO token:
http://blog.springsource.com/2009/09/28/spring-security-kerberos/

Some general information about kerberos from msdn:
http://msdn.microsoft.com/en-us/library/ms995329.aspx
http://msdn.microsoft.com/en-us/library/ms995330.aspx

Very nice articles about credentials delegation (you need that so your
app server can impersonate clients when it connects to the database)
http://s2.diffuse.it/blog/show/6602-SPNEGO_authentication_and_credential_delegation_with_Java
http://spnego.sourceforge.net/credential_delegation.html

I also had some java desktop apps which needed to authenticate in a
similar way, which use Spring HttpInvoker as a remoting protocol, so I
decided to make HttpInvoker pass some SPNEGO headers as well, and it
seems to work:
https://jira.springsource.org/browse/SES-11


We use Oracle as the database and some materials that were helpfull were these:
Oracle Jdbc connection with kerberos
http://download.oracle.com/docs/cd/E11882_01/java.112/e10589/clntsec.htm#insertedID7
http://download.oracle.com/javase/6/docs/api/javax/security/auth/Subject.html

Some general info on Oracle Advanced Security
http://download-west.oracle.com/docs/cd/B14099_19/idmanage.1012/b14085/odip_actdir001.htm#CHDDFFGG

If you also use Oracle I can send you a complete code example for this
- I have the whole thing working for simple tests..I should have a
more complete implementation in few weeks.

Cheers.

2011/3/7 הילה <hilavalensia@gmail.com>:
> Hey,
>
> The tomcat is running on windows server 2008 R2 STD
> I don't now if using windows authentication is less secure and affects all
> network's security, since this user have permissions only on the DB. you
> can't even perform login to servers with this user.
> anyway, I appreciate your comments and discussion of why it's less secure or
> not, but I need to perform this (task I've been given from guys in high
> above positions), so please help with what I'm trying to do :]
>
> If I can't use spnego and other stuff of the list i've found, what can I do?
>
> Thanks
> Hila
>
>
> 2011/3/6 André Warnier <aw@ice-sa.com>
>
>> ???? wrote:
>>
>>> Hey,
>>>
>>> I want to change the way that tomcat authenticates to the DB of our
>>> application, from SQL authentication to Windows authentication.
>>> We use Tomcat 6.0.29 , and the user and password to connect to the DB is
>>> specified in clear text in the xml configuration file under the folder
>>> conf/catalina/localhost.
>>> My goal is to remove the user and password from the xml file, and letting
>>> the tomcat windows service run with a domain user that has permissions to
>>> the DB.
>>>
>>> when I searched for a solutions for what i'm trying to do, i got to this
>>> page-
>>> http://wiki.apache.org/tomcat/FAQ/Windows#Q4
>>>
>>> Which suggest these methods:
>>> -Waffle/JNA
>>> -Tomcat SPNEGO
>>> -SPNEGO SF
>>> -Jespa (commercial)
>>> -Tomcat IIS Connector
>>> -Samba JCIFs (obsolete, no NTLMv2)
>>>
>>> Are one of these methods suit for what I'm trying to do?
>>> When reading about Tomcat SPNEGO, it says that users working on a windows
>>> client OS and IE or Firefox, can be silently authenticated (SSO) to a
>>> Tomcat
>>> running on a windows server via NTLM or kerberos. It doesn't seem to be
>>> what
>>> I aim for, since tomcat users are not interest me, only the tomcat windows
>>> service and how it connects to the DB
>>>
>>>  Exactly. Now you have the issue correctly framed.
>> And you are right above : all these methods indeed identify/authenticate
>> the client of the Tomcat application to Tomcat, not Tomcat itself to
>> something else. (**)
>>
>> The one thing missing in your description above, is that your Tomcat server
>> is running on a Windows machine.
>> And also that your back-end database system is able itself to perform user
>> authentication either in clear-text (user-id + password), or via Windows
>> NTLM authentication.
>>
>> (And, if the back-end database server is set to do NTLM authentication,
>> then it can only do so for Domain user-id's; NTLM authentication will not
>> work with a "server-local" user-id).
>>
>>
>> So now you have to make one additional effort of thinking rationally, and
>> answer the following fundamental question : why ?
>>
>> I mean, what exactly is the problem with having a user-id and a password
>> for the database, in clear in a Tomcat configuration file ?  Are there users
>> that can connect to the Tomcat server, and read those configuration files,
>> and which should not be able to do so ?
>>
>> And if that is the case, can you not do something like :
>>
>> a) either block these users from accessing the Tomcat server (the best
>> solution)
>> OR
>> b)
>> - start Tomcat under some Windows user-id (with password)
>> - set the permissions of the Tomcat configuration files, so that *only*
>> this user-id can read them ?
>>
>>
>> Various people have previously tried to point out different aspects which
>> remain true, among which :
>> 1) encrypting something is often a chicken-and-egg kind of problem : if you
>> encrypt something, then you need to decrypt it somewhere else; and the key
>> to decrypt it has to be stored somewhere also. And so on..
>> 2) in terms of security, it is much better to run Tomcat under a "server
>> local" user-id than as a Domain user-id.  That is because the local user-id
>> only gives access to the local machine, while a domain user-id gives access
>> to the whole domain.
>> By running Tomcat as a domain user, you decrease the security of the whole
>> network.
>> 3) security is always a matter of multiple layers of defense.  In this
>> case, your first line is to prevent unauthorised people to access the Tomcat
>> configuration files.
>> Because if they can do that, then they can break through any other security
>> that you would put in place.  Think about it : no matter how, Tomcat needs
>> access to the DB. If Tomcat has access to the the DB, then any user who can
>> control Tomcat can access the DB. (*)
>> 4) your second line of defense, would be that the DB server only accepts
>> connections from Tomcat.  This way, if someone can get hold of the user-id
>> of Tomcat, at least they cannot use it to access the DB directly.
>>
>>
>> (*) Suppose Tomcat runs under domain user-id XYZ, with a very secret
>> password.
>> If I can get access to the Tomcat configuration files, then I can also
>> install any Tomcat application somewhere, and make Tomcat run it.
>> And this application will run under the Tomcat user-id, even if I do not
>> know what this user-id is.  So this application could for example dump the
>> whole database in some network directory of my choice (and then, if I am
>> really a bad guy, delete the database too).
>>
>>
>> (**) unless you want real security of access to the DB, and have the Tomcat
>> application make its own connection to the DB, and authenticate to the DB as
>> the final user of the application.
>>
>>
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>>
>



-- 
Why?
Because YES!

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