[31665] in Kerberos
Re: KfW 3.2.2 multiple users via SSH
daemon@ATHENA.MIT.EDU (Jeffrey Altman)
Mon Nov 9 18:25:30 2009
X-Envelope-From: jaltman@secure-endpoints.com
X-MDaemon-Deliver-To: kerberos@mit.edu
Message-ID: <4AF8A480.3020600@secure-endpoints.com>
Date: Mon, 09 Nov 2009 18:23:44 -0500
From: Jeffrey Altman <jaltman@secure-endpoints.com>
MIME-Version: 1.0
To: petesea@bigfoot.com
In-Reply-To: <alpine.OSX.2.00.0911091408250.582@nikto-air>
Cc: kerberos@mit.edu
Reply-To: jaltman@secure-endpoints.com
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krbcc32s.exe is per session. You can't run two instances in the same
session with different authentication contexts. I don't know how the
sshd you are using is implemented but apparently it doesn't run the
underlying users in distinct logon sessions.
petesea@bigfoot.com wrote:
> I'm using Kerberos for Windows 3.2.2 on Windows XP SP3 and noticed a
> problem using kinit/klist when multiple users ssh to the host.
>
> If I ssh to the windows host as "userA", then run klist, I see the
> following:
>
> (as userA - krbcc32s NOT running)
> $ klist
> klist.exe: No credentials cache found (ticket cache API:krb5cc)
>
> That's as expected. And... looking at ProcessExplorer, the krbcc32s
> process is now running as "userA".
>
> Now, ssh as "userB" and run klist:
>
> (as userB - krbcc32s running as userA)
> $ klist
> klist.exe: Credentials cache I/O operation failed XXX while getting default ccache
>
> If I kill krbcc32s and redo the test, but login as "userB" first, I see
> just the reverse, ie:
>
> (as userB - krbcc32s NOT running)
> $ klist
> klist.exe: No credentials cache found (ticket cache API:krb5cc)
>
> (as userA - krbcc32s running as userB)
> $ klist
> klist.exe: Credentials cache I/O operation failed XXX while getting default ccache
>
> My first suspicion was the fact that the CC is the same for both users
> (API:krb5cc), but if I redo the above tests and set KRB5CCNAME to
> something unique for each user (eg. API:krb5cc_userA, API:krb5cc_userB) it
> fails the same way.
>
> If I use a unique "FILE:" credentials cache for each user (eg.
> FILE:C:/tmp/krb5cc_userA, FILE:C:/tmp/krb5cc_userB), then it seems to
> work, but krb5cc32s is running as the first user who started it, which
> bothers me.
>
> Soooo... 2 questions:
>
> 1) Is is not possible to use an API: credentials cache for more then one
> user?
>
> 2) Is it OK to use a FILE: credentials cache in this case even though
> krb5cc32s is running as the first user who started it?
> ________________________________________________
> Kerberos mailing list Kerberos@mit.edu
> https://mailman.mit.edu/mailman/listinfo/kerberos
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