Login attempt for nonexistent user on Alpine Linux

Szabolcs Nagy nsz at port70.net
Sat Dec 2 01:30:40 AWST 2017


* Hugo Genesse <hugo.genesse at polymtl.ca> [2017-12-01 17:07:25 +0000]:
> 
> First, thanks for your replies. I created another account:
> 
> admin:x:100:65533:Linux User,,,:/home/admin:/bin/ash
> 
> Here is the output of with -vvv:
> 

you added -vvv on the client side instead of the server where the problem is...

> debug3: authmethod_lookup password
> debug3: remaining preferred: ,password
> debug3: authmethod_is_enabled password
> debug1: Next authentication method: password
> admin at 127.0.0.1's password:
> debug3: send packet: type 50
> debug2: we sent a password packet, wait for reply
> debug3: receive packet: type 51
> debug1: Authentications that can continue: publickey,password
> Permission denied, please try again.
> admin at 127.0.0.1's password:
> debug3: send packet: type 50
> debug2: we sent a password packet, wait for reply
> debug3: receive packet: type 51
> debug1: Authentications that can continue: publickey,password
> Permission denied, please try again.
> admin at 127.0.0.1's password:
> debug3: send packet: type 50
> debug2: we sent a password packet, wait for reply
> debug3: receive packet: type 51
> debug1: Authentications that can continue: publickey,password
> debug2: we did not send a packet, disable method
> debug1: No more authentication methods to try.
> admin at 127.0.0.1: Permission denied (publickey,password).
> 
> and in the dropbear logs I still get:
> 
> [67] Dec 01 17:03:47 Child connection from <IP>:40878
> [67] Dec 01 17:03:47 Login attempt for nonexistent user from
> [...]
> 

make it more verbose, you will see what part of the user
lookup fails.

> I saw that I could create a configuration file in /etc/dropbear to allow
> root logins by it seems to be enabled by default and I would prefer just
> drop a binary on the device to enable ssh without changes to the system.
> Here is the openwrt page I'm referring:
> https://wiki.openwrt.org/doc/uci/dropbear
> 
> Thanks!
> 
> "Daniel." <danielhilst at gmail.com> a écrit :
> 
> > Can you log in with another user? The root login may be disabled by
> > security reasons.
> > 
> > 2017-12-01 13:01 GMT-02:00 Szabolcs Nagy <nsz at port70.net>:
> > 
> > > * Hugo Genesse <hugo.genesse at polymtl.ca> [2017-12-01 04:51:08 +0000]:
> > > > I've been trying to use dropbear (compiled myself statically with
> > > > ./configure; make STATIC=1) on a Alpine Linux Docker container (Linux
> > > > 4.13.12-1-ARCH) with the latest Alpine Docker image (3.6 if I'm not
> > > > mistaken). I run dropbear like this: "./dropbear -R" and can't login with
> > > > proper credentials. With the "-E" switch I get the following:
> > > >
> > > >  /root/dropbear -R -E
> > > > [59] Dec 01 04:31:32 Running in background
> > > > [60] Dec 01 04:31:36 Child connection from <IP>
> > > > [60] Dec 01 04:31:36 Login attempt for nonexistent user from <IP>
> > > >
> > > 
> > > i think you can use -vvv to see more detailed debug messages
> > > 
> > 
> > 
> > 
> > --
> > “If you're going to try, go all the way. Otherwise, don't even start. ..."
> >   Charles Bukowski
> 
> 


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