[Bug 705431] [NEW] publickey authentication on dropbear server fails

[Bernhard W]

Public bug reported:

I use publickey authentication to connect to a dropbear server.
this works when I use the older ssh-client in lucid or dbclient, it does not work with ssh-client in maverick or natty (1:5.6p1-2ubuntu4).
I noticed that after sending the publickey packet the log just continues without saying what happened with the packet.

Here is the ssh -vvv log:
...
debug1: Host '192.168.225.196' is known and matches the RSA host key.
debug1: Found key in /home/bernhard/.ssh/known_hosts:52
debug2: bits set: 500/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/bernhard/.ssh/id_rsa (0x7f91826c8110)
debug2: key: /home/bernhard/.ssh/id_dsa ((nil))
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/bernhard/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/bernhard/.ssh/id_dsa
debug3: no such identity: /home/bernhard/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/705431

Title:
  publickey authentication on dropbear server fails