Login attempt for nonexistent user

[Matt Johnston]

Hi Laurent,

My best guess is that it was built on lubuntu which uses glibc, but the Udoo board doesn't have the required /lib/somewhere/libnss*.so libraries - those get chosen at runtime based on /etc/nsswitch.conf. Building using a uclibc cross compiler would avoid that - how did you build it? Also which distribution does Udoo use?

If you can install strace on the Udoo board you can see what files are being tried with
strace -f -F -o logfile -s 300 dropbear -vFE

Cheers,
Matt


> On Tue 30/10/2018, at 5:28 pm, Laurent Bourdel <lbourdel at yahoo.fr> wrote:
> 
> 
> with correct subject :
> 
> Hi,
> 
> I fail to login with ssh client to dropbox
> 
> I use Udoo ARM board with busybox to install ssh server
> 
> I cross compiled dropbear under VirtualBox lubuntu and install binary to board ( /bin & /sbin)
> 
> I generate RSA key (ssh-keygen -t rsa ) under lubuntu and copied  content to /home/root/.ssh/authorized_keys on Udoo board
> 
> I run on Udoo board : dropbear -vFE
> 
> On VM lubuntu : ssh  -vvv root at 192.168.0.2
> 
> I add trace on dropbear sources and found problem come with function getpwnam to read /etc/password with 
> 
> errno=0;
> pw = getpwnam(username);
> 
> dropbear_log(LOG_WARNING,"LBR %s %d %s",__FILE__ ,__LINE__, strerror(errno));
> if (!pw) {
> return;
> }
> 
> [157] Jan 01 01:06:50 LBR common-session.c 595 No such file or directory

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