sshd, how is this possible, security bug?

[Jonathan T. Sage]

Didier Wiroth wrote:

> Hi,
> 
> using freebsd 5.2 release.
> 
> Below you can see what is not commented out in my sshd_config file, which is almost the default:
> #$FreeBSD: src/crypto/openssh/sshd_config,v 1.33 2003/09/24 19:20:23 des Exp $
> #VersionAddendum FreeBSD-20030924
> Protocol 2
> ListenAddress x.y.z.x
> LoginGraceTime 60
> PubkeyAuthentication yes
> PasswordAuthentication no
> PermitEmptyPasswords no
> PrintMotd yes
> PrintLastLog yes
> AllowGroups ssh
> Banner /usr/local/etc/ssh/banner
> Subsystem       sftp    /usr/libexec/sftp-server
> 
> I'm using ssh windows client version 3.2.9 from:
> http://www.ssh.com
> I get a passphrase prompt, I enter xyz, press enter, than I'm prompted to enter my "password", I enter the password and I have my prompt:
> me at mypc:
> 
> Is this a security bug, a misconfiguration or what?
> 
> I thought I had disabled password authentication with: PasswordAuthentication no
> 
> thx a lot
>

you did.  from ssh's point of view.  however, pam is enabled, and it 
allows password authentication.  to do what you're asking, edit 
sshd_config again, and toggle this line

# Change to no to disable PAM authentication
ChallengeResponseAuthentication no

this is my fix, it allows only pubkey logins.  i'm sure this is also 
possible with PAM, and actually, would love to know how that works too :)

hope this helps ~j

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