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add skey to sshd:

1) pass *pw to auth_password() not user_name, do_authentication already
   keeps private copy of struct passwd for current user.
2) limit authentication attemps to 5, otherwise
        ssh -o 'NumberOfPasswordPrompts 100000' host
   lets you enter 100000 passwds
3) make s/key a run-time option in /etc/sshd_config
4) generate fake skeys,
   for s/key for nonexisting users, too
   limit auth-tries for nonexisting users, too.
Note that
% ssh -l nonexisting-user -o 'NumberOfPasswordPrompts 100000' host
has NO limits in ssh-1.2.27

# This is ssh server systemwide configuration file.

Port 22
ListenAddress 0.0.0.0
HostKey /etc/ssh_host_key
ServerKeyBits 768
LoginGraceTime 600
KeyRegenerationInterval 3600
PermitRootLogin yes
#
# Don't read ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
StrictModes yes
QuietMode no
X11Forwarding no
X11DisplayOffset 10
FascistLogging no
PrintMotd yes
KeepAlive yes
SyslogFacility AUTH
RhostsAuthentication no
#
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
#
# Changed RSAAuthentication to no/bg
RSAAuthentication yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
PermitEmptyPasswords no
# Uncomment to disable s/key passwords 
#SkeyAuthentication no

# To change Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#AFSTokenPassing no
#KerberosTicketCleanup no

# Kerberos TGT Passing does only work with the AFS kaserver
#KerberosTgtPassing yes

# XXX implement these
#UseLogin no
#CheckMail no

# AllowHosts *.our.com friend.other.com
# DenyHosts lowsecurity.theirs.com *.evil.org evil.org