1  #!/bin/bash
   2  # kumar.mcmillan -at- farmdev.com
   3  
   4  function usage()
   5  {
   6      echo ""
   7      echo "Authorizes a host for automatic SSH use by sending your key to the remote host ..."
   8      echo "Usage: $0 remote_host_to_authorize [username:=defaults to current username]"
   9      echo ""
  10  }
  11  
  12  function cleanup()
  13  {
  14      if [ -f $TEMP_PUB_KEY_XFER ]
  15      then
  16          rm $TEMP_PUB_KEY_XFER
  17      fi
  18  }
  19  
  20  function exit_on_error()
  21  {
  22      cleanup
  23      exit 1
  24  }
  25  
  26  if [ $# -lt 1 -o "$1" = "-h" -o "$1" = "--help" ]
  27  then
  28      usage
  29      exit 0
  30  fi
  31  
  32  PUB_KEY=~/.ssh/id_dsa.pub
  33  if [ $# -eq 2 ]; then
  34      USER=$2
  35  else
  36      USER=`whoami`
  37  fi
  38  HOST_TO_AUTH=$1
  39  TEMP_PUB_KEY_XFER=/tmp/$USER"_TEMP_KEY"
  40  
  41  echo "checking for $PUB_KEY ..."
  42  if [ ! -f $PUB_KEY ]; then
  43      echo "generating your dsa public key (leave passphrase blank and save to $PUB_KEY when prompted) ..."
  44      ssh-keygen -t dsa
  45      if [ $? -ne 0 ]; then
  46          echo "ssh-keygen failed"
  47          exit_on_error
  48      fi
  49  fi
  50  echo "OK"
  51  
  52  echo "for the following commands you will be asked to supply your password for $HOST_TO_AUTH :"
  53  
  54  echo "copying a temp pub key to $HOST_TO_AUTH ..."
  55  cat $PUB_KEY > $TEMP_PUB_KEY_XFER
  56  chmod 700 $TEMP_PUB_KEY_XFER
  57  echo "OK"
  58  
  59  remote_key=`basename $TEMP_PUB_KEY_XFER`
  60  scp $TEMP_PUB_KEY_XFER $USER@$HOST_TO_AUTH:~/$remote_key
  61  if [ $? -ne 0 ]; then
  62      echo "scp failed"
  63      exit_on_error
  64  fi
  65      
  66  echo "authorizing $HOST_TO_AUTH for automatic SSH use ..."
  67  ssh $USER@$HOST_TO_AUTH "cat ~/$remote_key >> ~/.ssh/authorized_keys; rm ~/$remote_key"
  68  if [ $? -ne 0 ]; then
  69      echo "ssh failed"
  70      exit_on_error
  71  fi
  72  echo "OK"
  73  
  74  cleanup
  75  echo "authorization successful!  you can now login automatically to $HOST_TO_AUTH"
  76  exit 0