Bug 8299 - kppp and userhelper breaks with X11 forwarding
kppp and userhelper breaks with X11 forwarding
Product: Red Hat Linux
Classification: Retired
Component: usermode (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Nalin Dahyabhai
Depends On:
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Reported: 2000-01-08 17:41 EST by Albert Strasheim
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2000-02-02 08:23:33 EST
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Description Albert Strasheim 2000-01-08 17:41:08 EST
When one fires up kppp on say, from, using .3's
display, using openssh to manage X11 forwarding (although I imagine this
will be a common problem), the userhelper GTK password dialog pops up, asks
for the root password and then quits, leaving kppp unstarted.

Is this a problem with userhelper, X11 forwarding or kppp?

My second box will be returning to its owner soon, so I won't be able to
duplicate this bug much longer.
Comment 1 Nalin Dahyabhai 2000-01-13 18:01:59 EST
Which version of openssh are you running?  Are there any error messages being
printed to the console by kppp?
Comment 2 Albert Strasheim 2000-01-14 12:21:59 EST
I'm running openssh-1.2.1pre25-1 (with openssl-0.9.4-3), both built from SRPMS
found on http://www.firedrake.org/openssh/files/

There weren't any error messages, kppp just died silently.

Ditto with rp3-config. And this is with a connect to myself (ie.

I hope I'm not barking up the wrong tree here, but most other apps I tried,
including GIMP and netscape worked fine.
Comment 3 Nalin Dahyabhai 2000-01-24 09:04:59 EST
This is the first I've heard of this, but it sounds like it might be an obscure
usermode bug of some kind, so I can't be completely sure.  Are there any
error messages in /var/log/messages or /var/log/secure?  Is there any indication
of usermode crashing somehow (core dump, error messages, etc)?  When you ssh in
as root, does running /usr/sbin/kppp directly work?
Comment 4 Albert Strasheim 2000-01-25 12:44:59 EST
When ssh'ing from a normal user under X to the root user, and executing kppp (as
root), I get the following error:

-- error start --

X11 connection rejected because of wrong authentication.

kppp: Fatal IO error: client killed

-- error end --

I assume running as root bypasses userhelper?

Ditto for ssh'ing from root to root. Also, for some strange reason, when I log
out, the ssh session refuses to die on the client side. Nothing of interest in
any of the logfiles.
Comment 5 Nalin Dahyabhai 2000-02-02 08:23:59 EST
Programs gated by userhelper have a symlink in /usr/bin/<appname> that points
to userhelper, and userhelper's configuration file under
/etc/security/console.apps lists the "real" binary's location, which is almost
always in /usr/sbin.  Running this program from /usr/sbin bypasses userhelper
entirely if you're root, and should not work (or at least, not completely) as a
non-root user.
Comment 6 Nalin Dahyabhai 2000-08-29 10:32:56 EDT
Ah, this was a *very* specific usermode/pam_xauth interaction problem, which
should be solved by today's errata.

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