RSA versus DSA / Protocol 1 versus Protocol 2

[Bob Proulx]

> that should work.  sshd -d would be useful.

In that case I must have something really stupid in the sshd_config
file to which I am blind.  But it is almost the stock one distributed
with openssh-3.0.2p1.  Here is what I get.

> [root at jenny openssh]# ./sshd -d -p24
> debug1: sshd version OpenSSH_3.0.2p1
> debug1: private host key: #0 type 0 RSA1
> debug1: read PEM private key done: type RSA
> debug1: private host key: #1 type 1 RSA
> debug1: Bind to port 24 on 0.0.0.0.
> Server listening on 0.0.0.0 port 24.
> Generating 768 bit RSA key.
> RSA key generation complete.

[root at joseki /etc]# sshd -d -f sshd_config.hacked
debug1: Seeding random number generator
debug1: sshd version OpenSSH_3.0.2p1
debug1: private host key: #0 type 0 RSA1
debug1: private host key: #1 type 0 RSA1        <----- Should this be RSA?
Disabling protocol version 2. Could not load host key
socket: Invalid argument
debug1: Bind to port 2022 on 0.0.0.0.
Server listening on 0.0.0.0 port 2022.
Generating 768 bit RSA key.
RSA key generation complete.

Hmm..

  cmp /etc/ssh_host_key /etc/ssh_host_rsa_key
  [no differences]

That must be the source of my problem.  Regenerating the rsa2 key to
see if this solves the problem...

That was it!  Problem solved.  Somewhere along the way I had
(apparently) believed that an rsa host key was an rsa host key and
could be 'cp /etc/ssh_host_key /etc/ssh_host_rsa_key' since I had
obviously done that and they were both rsa1 files.  And with nothing
to ever change that key again that is the way that it was.

Thanks
Bob