FIRST-SUCCESSFUL SCRIPT -- NEEDED EDITION -- FIRST SUCCESSFUL ONE

#!/bin/bash

# Server Tested : compute90-cc : 8.25.218.59 10.170.16.186 : compute90-cc.packet8-pilot.net


#####   --  Author of Script  - Sreejith Balakrishnan   

#####       Purpose : 1. This script capture failed logins for root users whoever fails to connect successfully in their first 5 attempts 

#####                 2. And only if those 5 failed attempts happens within 15 min timeline -- In such cases logs are generated


#set -x


###-----------------

##### Declarations :

###-----------------


#####   --  Put in the number of Failed Login Attempts you want to capture


attempted_counts=5


#####   --  Time in minutes within which the count of login attempts to be captured


seconds=900


###------------------------

##### End of Declations :

###------------------------




root_login(){


#rm -Rf /tmp/logins_1.log

#rm -Rf /tmp/logins_2.log

#rm -Rf /tmp/logins_11.log

#rm -Rf /tmp/logins_111.log

#rm -Rf /tmp/logins_12.log

#rm -Rf /tmp/logins_122.log


rm -Rf /tmp/LOGIN_FAILED_DETAILS1.log

rm -Rf /tmp/LOGIN_FAILED_DETAILS2.log

rm -Rf /tmp/LOGIN_FAILED_ROOT.log

rm -Rf /tmp/LOGIN_FAILED_DETAILS.log

rm -Rf /var/log/LOGIN_FAILED_ROOT.log

rm -Rf /var/log/total_login_attempts_root.log


today=`date`

echo " "

echo "--------------------------------------------------------------------------------------"

echo "System Date and Time : $today "

echo "--------------------------------------------------------------------------------------"

echo " "


date | awk '{print $2}' > /tmp/logins_1.log

value1=`cat /tmp/logins_1.log`

date | awk '{print $3}' > /tmp/logins_2.log

value2=`cat /tmp/logins_2.log`


lastb -F | awk '{print $11}' >> /tmp/logins_11.log

head -n 1 /tmp/logins_11.log > /tmp/logins_111.log

value11=`cat /tmp/logins_111.log`

lastb -F | awk '{print $12}' >> /tmp/logins_12.log

head -n 1 /tmp/logins_12.log > /tmp/logins_122.log

value12=`cat /tmp/logins_122.log`


if [ "${value2}" == "${value12}" ]

then

   if [ "${value1}" == "${value11}" ]

   then

     ####--Failed Login Attempts by users  ------------------------------------------------------

     lastb -F >> /tmp/LOGIN_FAILED_DETAILS.log


     ####Today's Date is extracted  -------------------------------------------------------------

     cat /tmp/LOGIN_FAILED_DETAILS.log | grep -wi ${value12} >> /tmp/LOGIN_FAILED_DETAILS1.log

     cat /tmp/LOGIN_FAILED_DETAILS1.log | grep -wi "$value11" >> /tmp/LOGIN_FAILED_DETAILS2.log


     ####--filtering root user  -----------------------------------------------------------------

     sed -n '/root/p' /tmp/LOGIN_FAILED_DETAILS2.log >> /tmp/LOGIN_FAILED_ROOT.log


     if [ -s /tmp/LOGIN_FAILED_ROOT.log ]

     then

       cp /tmp/LOGIN_FAILED_ROOT.log /var/log/LOGIN_FAILED_ROOT.log

       cat /var/log/LOGIN_FAILED_ROOT.log

       cat /var/log/LOGIN_FAILED_ROOT.log | wc -l > /var/log/total_login_attempts_root.log

       attempts=`cat /var/log/total_login_attempts_root.log`

       echo " "

       echo " "

       echo "--------------------------------------------------------------------------------------"

       echo "Total Number of Failed login attempts by Root User : $attempts"

       echo "--------------------------------------------------------------------------------------"

      echo " "

     fi

   fi

else 

    echo " "

    echo "-------------------------------------------------------------------------------"

    echo "No Failed login found for root user today : `date`"

    echo "-------------------------------------------------------------------------------"

    echo " "

fi

}




####

#### -- Converting Time to Seconds for calculation & if attempts were with in 15 minutes

####



convert_time_seconds() {


#!/bin/bash


rm -Rf /tmp/logins1_1.log

rm -Rf /tmp/logins1_2.log

rm -Rf /tmp/logins1_11.log

rm -Rf /tmp/logins1_111.log

rm -Rf /tmp/logins1_12.log

rm -Rf /tmp/logins1_122.log

rm -Rf /tmp/failed_logins1_1.log

rm -Rf /tmp/failed_logins_today1_1.log

rm -Rf /tmp/failed_logins_today1_2.log

rm -Rf /tmp/failed_logins_today1_3.log

rm -Rf /tmp/time_first_line1_1.log

rm -Rf /tmp/time_first_line1_2.log

rm -Rf /tmp/time_last_line1_2.log

rm -Rf /tmp/time_second_line1_3.log

rm -Rf /tmp/failed_logins_today1_4.log

rm -Rf /tmp/failed_logins_today1_5.log

rm -Rf /tmp/failed_logins_today1_4.log

rm -Rf /tmp/failed_logins_today1_5.log

rm -Rf /tmp/failed_logins_today1_6.log

rm -Rf /tmp/failed_logins_today1_7.log



date | awk '{print $2}' > /tmp/logins1_1.log

value1=`cat /tmp/logins1_1.log`

date | awk '{print $3}' > /tmp/logins1_2.log

value2=`cat /tmp/logins1_2.log`


lastb -F | awk '{print $11}' >> /tmp/logins1_11.log

head -n 1 /tmp/logins1_11.log > /tmp/logins1_111.log

value11=`cat /tmp/logins1_111.log`

lastb -F | awk '{print $12}' >> /tmp/logins1_12.log

head -n 1 /tmp/logins1_12.log > /tmp/logins1_122.log

value12=`cat /tmp/logins1_122.log`



      ####--Failed Login Attempts by users  ------------------------------------------------------

      lastb -F > /tmp/failed_logins1_1.log

  

      ####Today's Date is extracted  -------------------------------------------------------------

      cat /tmp/failed_logins1.log | grep -wi ${value12} >> /tmp/failed_logins_today1_1.log

      cat /tmp/failed_logins_today_1.log | grep -wi "$value11" >> /tmp/failed_logins_today1_2.log

  

      ####--filtering root user  -----------------------------------------------------------------

      awk '/root/{print}' /tmp/failed_logins_today1_2.log > /tmp/failed_logins_today1_3.log

  #sed -n '/root/p' /tmp/failed_logins_today1_2.log > /tmp/failed_logins_today1_3.log

  

  if [ "${value2}" == "${value12}" ]

      then

        if [ "${value1}" == "${value11}" ]

         then

            cat /tmp/failed_logins_today1_3.log | awk '{print $7}' > /tmp/failed_logins_today1_4.log

            head -n 1 /tmp/failed_logins_today1_4.log > /tmp/failed_logins_today1_5.log



            cat /tmp/failed_logins_today1_3.log | sed -n '5p' | awk '{print $7}' > /tmp/failed_logins_today1_7.log

      fi

  fi


TIME1=`cat /tmp/failed_logins_today1_5.log`

TIME2=`cat /tmp/failed_logins_today1_7.log`


# Convert the times to seconds from the Epoch

SEC1=`date +%s -d ${TIME1}`

SEC2=`date +%s -d ${TIME2}`


# Use expr to do the math, let's say TIME1 was the start and TIME2 was the finish

DIFFSEC=`expr ${SEC1} - ${SEC2}`



echo "--------------------------------------------------------------------------------------"

echo ""

echo "        ###             *** THIS LOG IS CAPTURED ***                    ###           "

echo "        ###     When a *root* user makes 5 failed login attempts        ###           "

echo "        ###        within 15 minutes (900 Seconds) " window             ###           "

echo ""

echo "--------------------------------------------------------------------------------------"


echo "--------------------------------------------------------------------------------------"

echo " ** Found 5 or more 'Failed Login attempts by user *root*' in : ${DIFFSEC} seconds ** "

echo "--------------------------------------------------------------------------------------"



how_many_sec=`echo ${DIFFSEC}`

echo " "


if [ $how_many_sec -le $seconds ]

then 

   root_login

else 

   echo " "

   echo "----------------------------------------------------------------------------------- "

   echo "    *** The 5 failed attempts by the root users were not with in 15 Minutes ***     "

   echo "----------------------------------------------------------------------------------- "

   echo " "

fi

}


####

#### -- Check the condition of no. of failed login attempts are 5 or more

####



check_condition() {


rm -Rf /tmp/logins_1.log

rm -Rf /tmp/logins_2.log

rm -Rf /tmp/logins_11.log

rm -Rf /tmp/logins_111.log

rm -Rf /tmp/logins_12.log

rm -Rf /tmp/logins_122.log

rm -Rf /tmp/failed_logins_today_1.log

rm -Rf /tmp/failed_logins_today_2.log

rm -Rf /tmp/failed_logins1.log

rm -Rf /tmp/failed_logins2.log


date | awk '{print $2}' > /tmp/logins_1.log

value1=`cat /tmp/logins_1.log`

date | awk '{print $3}' > /tmp/logins_2.log

value2=`cat /tmp/logins_2.log`


lastb -F | awk '{print $11}' >> /tmp/logins_11.log

head -n 1 /tmp/logins_11.log > /tmp/logins_111.log

value11=`cat /tmp/logins_111.log`

lastb -F | awk '{print $12}' >> /tmp/logins_12.log

head -n 1 /tmp/logins_12.log > /tmp/logins_122.log

value12=`cat /tmp/logins_122.log`


  ####--Failed Login Attempts by users  ------------------------------------------------------

  lastb -F > /tmp/failed_logins1.log

  

  ####Today's Date is extracted  -------------------------------------------------------------

  cat /tmp/failed_logins1.log | grep -wi ${value12} >> /tmp/failed_logins_today_1.log

  cat /tmp/failed_logins_today_1.log | grep -wi "$value11" >> /tmp/failed_logins_today_2.log

  

  ####--filtering root user  -----------------------------------------------------------------

  awk '/root/{print}' /tmp/failed_logins1.log >> /tmp/failed_logins2.log

  

  lines_in_file=`wc -l < /tmp/failed_logins_today_2.log`

  count_of_attempts=$lines_in_file


  if [ $count_of_attempts -ge $attempted_counts ] 

  then

    if [ "${value2}" == "${value12}" ] && [ "${value1}" == "${value11}" ]

then

      convert_time_seconds

else 

      echo "----------------------------------------------------------------------------------- "

      echo " No Failed Logins found *Today* according to the condition  "

      echo "----------------------------------------------------------------------------------- "

fi

  else 

    echo "-------------------------------------------------------------------------------------- "

    echo "         No Failed Login attempts found *Today* according to the condition             "

echo "       There must be 5 Failed Login Attempts by user *root* within 15 minutes          "

echo "                      window to capture the information                                "

    echo "-------------------------------------------------------------------------------------- "

  fi

}


check_condition

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