[Buildroot] Dropbear remote login fails

[Peter Korsgaard]

>>>>> "Petr" == Petr Kulhavy <brain at jikos.cz> writes:

 > Hi,
 > recently I upgraded my system to the latest version of
 > buildroot. After that I noticed that I cannot any longer ssh on my
 > device because the default shell /bin/sh for the root is not in
 > /etc/shells.

 > Shouldn't it be added there? Or have I misconfigured something?

With 'upgraded' do you mean you are using git head and not
E.G. 2017.11.2?

We recently had a patch changing this for bash:

commit 4d279697afbf8fb295274784103be2b837113d5e
Author: Romain Naour <romain.naour at smile.fr>
Date:   Sat Jan 13 17:05:27 2018 +0100

    package/bash: add /bin/bash to /etc/shells

    When bash is selected, /bin/bash is not added to /etc/shells
    (see man shells). So, login tools like dropbear reject the ssh
    connexions for users using bash as shell in /etc/passwd.

    buildroot authpriv.warn dropbear[853]: User 'kubu' has invalid shell, rejected

    Reported-by: Jeremy Rosen <jeremy.rosen at smile.fr>
    Signed-off-by: Romain Naour <romain.naour at smile.fr>
    Cc: "Yann E. MORIN" <yann.morin.1998 at free.fr>
    Acked-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
    Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>

This has the side effect of adding an /etc/shells file to your rootfs
where we didn't use to have one (and libc falls back to /bin/sh +
/bin/csh if /etc/shells doesn't exist), so if you have bash enabled then
/bin/sh is no longer accepted.

There's a patch series pending in patchwork fixing this. It would be
great if you could give it a test:

http://patchwork.ozlabs.org/project/buildroot/list/?series=24357

-- 
Bye, Peter Korsgaard