add script to help with checking successful SSH authentication and placement of public SSH key

ssh-checker.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+########################################################################
+#  Copyright (C) 2017 Max Mehl <mail [at] mehl [dot] mx>
+########################################################################
+#  
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#  
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#  
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#  
+########################################################################
+#  
+#  Reads hosts file and checks SSH access. If not possible with public 
+#  key, this script tries to place the system's public key on the host 
+#  via a normal (password-based) SSH access attempt. 
+#  
+########################################################################
+
+CURDIR=$(dirname "$(readlink -f "$0")")
+if [ ! -e "$CURDIR"/config.cfg ]; then echo "Missing config.cfg file. Edit and rename config.cfg.sample"; exit 1; fi
+source "$CURDIR"/config.cfg
+
+if [ ! -e "$HOSTS" ]; then echo "Missing hosts file. Please set a correct value of HOSTS= in your config file. Current value: $HOSTS"; exit 1; fi
+
+function trim {
+  sed -r -e 's/^\s*//g' -e 's/\s*$//g'
+}
+
+while read line; do
+  if $(echo "$line" | grep -qE "^\s*#"); then continue; fi
+
+  RHOST=$(echo "$line" | cut -d";" -f1 | trim)
+  
+  echo "[INFO] Trying ${RHOST}"
+  
+  STATUS=$(ssh -n -o BatchMode=yes -o ConnectTimeout=5 ${RHOST} "echo -n"; echo $?)
+
+  if [ $STATUS != 0 ]; then
+    echo "[ERROR] No SSH login possible for ${RHOST}. Adding public key with password:"
+    cat ~/.ssh/id_rsa.pub | ssh ${RHOST} 'cat >> ~/.ssh/authorized_keys'
+  else
+    echo "[SUCCESS] SSH login possible for ${RHOST}."
+  fi
+  
+  echo
+
+done < "$HOSTS"