SSH users management tool

You can download this SSH management tool here. 

  1. #!/bin/bash
  2.  
  3. DENY_LIST="/etc/ssh/denyusers"
  4. CHOICE=0
  5.  
  6. list_user()
  7. {
  8.     less $DENY_LIST   
  9. }
  10.  
  11. deny_user()
  12. {
  13.     read -p "Username to deny: " USER
  14.  
  15.     cat /etc/passwd | cut -d: -f1 | grep $USER &> /dev/null
  16.  
  17.     if [ $? -eq 0 ]; then
  18.         cat $DENY_LIST | cut -d: -f1 | grep $USER &> /dev/null
  19.  
  20.         if [ $? -eq 0 ]; then
  21.             echo -e "User already denied\n"
  22.         else
  23.             echo "$USER" >> $DENY_LIST
  24.         fi
  25.     else
  26.         echo -e "User does not exists\n"
  27.     fi
  28. }
  29.  
  30. reallow()
  31. {
  32.     read -p "Username to deny: " USER
  33.  
  34.     cat $DENY_LIST | cut -d: -f1 | grep $USER > /dev/null 2> /dev/null
  35.  
  36.     if [ $? -eq 0 ]; then
  37.         sed -i '/^'$USER'$/d' $DENY_LIST
  38.         # Remove empty line
  39.         sed -i '/^$/d' $DENY_LIST
  40.     else
  41.         echo -e "User not denied\n"
  42.     fi
  43. }
  44.  
  45.  
  46. while [ "$CHOICE" -ne 4 ]
  47. do
  48.     case "$CHOICE" in
  49.         1)
  50.             list_user
  51.             CHOICE=0
  52.         ;;
  53.         2)
  54.             deny_user
  55.             CHOICE=0
  56.         ;;
  57.         3)
  58.             reallow
  59.             CHOICE=0
  60.         ;;
  61.         4)
  62.             exit 1
  63.         ;;
  64.         *)
  65.             echo -e "\n=== SSH USERS ==="
  66.             echo " [1] List denied users"
  67.             echo " [2] Deny an user"
  68.             echo " [3] Re-allow a denied user"
  69.             echo " [4] Quit"
  70.             read -p "Your choice ? " CHOICE
  71.             echo 
  72.         ;;
  73.     esac 
  74.  
  75.     #clear
  76. done
  77.