GDM login asks only password on login failure

[Gavin McCullagh]

Hi,

On Tue, 06 Nov 2007, Gavin McCullagh wrote:

> Just to be clear, is this problem on an ordinary thin client?  If so, the
> problem is with LDM not GDM so we need to track down a different issue.

Scott B is the author of ldm2, so he's the authority on this but I think I
can see your problem and can talk you through a temporary fix if necessary.

I'm not expecting you to necessarily understand what follows, but I'm
putting it out there so others who do might comment.

In ldm2/ldm.c line 265 we add two lines so it looks like:

    cmd[i++] = "/usr/bin/ssh";
    cmd[i++] = "-o";    // added temporarily
    cmd[i++] = "NumberOfPasswordPrompts=1"; // added temporarily
    cmd[i++] = "-X";

and in ldm2/sshutils.c line 49 we add two more lines:

    sshcmd[i++] = "/usr/bin/ssh";
    sshcmd[i++] = "-o";  // added temporarily 
    sshcmd[i++] = "NumberOfPasswordPrompts=1"; // added temporarily
    sshcmd[i++] = "-X";

which should cause ssh client to only prompt once for a password.  I'm not
currently in a position to test this, so if someone else can that would be
great.

Here are rough instructions for how to make the change, build and install
into LTSP.

	mkdir src
	cd src
	apt-get source ldm
	sudo apt-get build-dep ldm
	cd ltsp-5.0.39/

	# edit the two files adding two lines as above:
	vim client/ldm2/src/ldm.c
	vim client/ldm2/src/sshutils.c

	# rebuild the ltsp packages
	debuild -us -uc
	# copy the new package to the ltsp chroot
	sudo cp ldm_5.0.39_i386.deb /opt/ltsp/i386/root/
	sudo chroot /opt/ltsp/i386 dpkg -i /root/ldm_5.0.39_i386.deb
	sudo ltsp-update-images

One complication here is that if you've got an amd64 package the build
process will build ldm_5.0.39_amd64.deb not ldm_5.0.39_i386.deb.  If this
is an issue, I'll have to figure out how to sort that out.

Gavin