ssh-no-password.sh

#!/bin/sh

# create ssh connections without giving a password

if [ $# -lt 1 ]; then
  echo Usage: $0 username@remotehost
  exit
fi
remote="$1"  # 1st command-line argument is the user@remotehost address
this=$HOST   # name of client host

# first check if we need to run ssh-keygen for generating
# $HOME/.ssh with public and private keys:
if [ ! -d $HOME/.ssh ]; then
  echo "just type RETURN for each question:" # no passphrase - unsecure!!
  # generate RSA1, RSA and DSA keys:
  echo; echo; echo
  ssh-keygen -t rsa1
  echo; echo; echo
  ssh-keygen -t rsa
  echo; echo; echo
  ssh-keygen -t dsa
else
  # we have $HOME/.ssh, but check that we have all types of
  # keys (RSA1, RSA, DSA):
  if [ ! -f $HOME/.ssh/identity ]; then
     # generate RSA1 keys:
     echo "just type RETURN for each question:" # no passphrase - unsecure!!
     ssh-keygen -t rsa1
  fi
  if [ ! -f $HOME/.ssh/id_rsa ]; then
     # generate RSA keys:
     echo "just type RETURN for each question:" # no passphrase - unsecure!!
     ssh-keygen -t rsa
  fi
  if [ ! -f $HOME/.ssh/id_rsa ]; then
     # generate DSA keys:
     echo "just type RETURN for each question:" # no passphrase - unsecure!!
     ssh-keygen -t dsa
  fi
fi


cd $HOME/.ssh

if [ ! -f config ]; then
  # make ssh try ssh -1 (RSA1 keys) first and then ssh -2 (DSA keys)
  echo "Protocol 1,2" > config
fi

# copy public keys (all three types) to the destination host:

echo; echo; echo
# create .ssh on remote host if it's not there:
ssh $remote 'if [ ! -d .ssh ]; then mkdir .ssh; fi' 
# copy RSA1 key: 
scp identity.pub ${remote}:.ssh/${this}_rsa1.pub
# copy RSA key:
#scp id_rsa.pub ${remote}:.ssh/${this}_rsa.pub
# copy DSA key:
scp id_dsa.pub ${remote}:.ssh/${this}_dsa.pub
# make authorized_keys(2) files on remote host:

echo; echo; echo
# this one copies all three keys:
#ssh $remote "cd .ssh; touch authorized_keys authorized_keys2; cat ${this}_rsa1.pub >> authorized_keys; cat ${this}_rsa.pub >> authorized_keys2; cat ${this}_dsa.pub >> authorized_keys2;"
# this one copies RSA1 and DSA keys:
ssh $remote "cd .ssh; touch authorized_keys authorized_keys2; cat ${this}_rsa1.pub >> authorized_keys; cat ${this}_dsa.pub >> authorized_keys2;"

echo; echo; echo
echo "try an ssh $remote"