[Bug 362427] [NEW] Public key ssh auth doesn't work in Jauny

[Alexander Kraev]

Public bug reported:

Spent all night to understand why public key ssh auth doesn't work. It
seems to me that issue only affects Jaunty. Please have a look at the
details below.

So, the configuration is:

1. Client
- lsb_release: Ubuntu 8.10 intrepid
- ssh-client: OpenSSH_5.1p1 Debian-3ubuntu1, OpenSSL 0.9.8g 19 Oct 2007

2. Server A
- lsb_release: Ubuntu 8.04.2 hardy
- sshd: OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007

3. Server B
- lsb_release: Ubuntu 9.04 jaunty
- sshd: OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007

Server A and Server B have the same /etc/ssh/sshd_config:
RSAAuthentication yes
PubkeyAuthentication yes
StrictModes no

I turned StrictModes to "no", but every server has the same permissions
on user's .ssh folder and .ssh/authorized_keys file. authorized_keys is
the same on Server A and Server B.

So, I am able to connect with public key from Client machine to Server
A, but I can't connect to Server B.

I run ssh client and sshd on Server B in debug mode, please find logs
attached.

Most important strings from auth.log:

...
Apr 16 20:58:47 ubuntu sshd[21728]: debug3: mm_request_receive entering
Apr 16 20:58:47 ubuntu sshd[21728]: debug3: monitor_read: checking request 21
Apr 16 20:58:47 ubuntu sshd[21728]: debug3: mm_answer_keyallowed entering
Apr 16 20:58:47 ubuntu sshd[21728]: debug3: mm_answer_keyallowed: key_from_blob: 0xb9084978
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: temporarily_use_uid: 1000/1000 (e=0/0)
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: trying public key file /home/sasha/.ssh/authorized_keys
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: restore_uid: 0/0
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: temporarily_use_uid: 1000/1000 (e=0/0)
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: trying public key file /home/sasha/.ssh/authorized_keys2
Apr 16 20:58:47 ubuntu sshd[21728]: debug1: restore_uid: 0/0
Apr 16 20:58:47 ubuntu sshd[21728]: Failed publickey for sasha from 10.0.0.11 port 51194 ssh2
Apr 16 20:58:47 ubuntu sshd[21728]: debug3: mm_answer_keyallowed: key 0xb9084978 is not allowed
...

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


** Tags: issue jaunty key public ssh

-- 
Public key ssh auth doesn't work in Jauny
https://bugs.launchpad.net/bugs/362427
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