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自动选题: 20191203 Bash Script to Check Successful and Failed User Login Attempts on Linux
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Bash Script to Check Successful and Failed User Login Attempts on Linux)
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[#]: via: (https://www.2daygeek.com/bash-script-to-check-successful-and-failed-user-login-attempts-on-linux/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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Bash Script to Check Successful and Failed User Login Attempts on Linux
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======
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One of the typical tasks of Linux administrators is to check successful and failed login attempts in the Linux system.
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This ensures that there are no illegal attempts at the environment.
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It is very difficult to manually verify them because the output of the **“/var/log/secure”** file looks awkward.
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To make this easier and more effective, we need to write a bash script.
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Yes, you can achieve this using the following **[Bash script][1]**.
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I’ve included two shell scripts in this tutorial.
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These scripts will show the number of users logged into the system for a given date. Also, it shows successful login attempts and failed login attempts.
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The first **[shell script][2]** allows you to verify user access information for any date available in the **“/var/log/secure”** file.
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The second bash script allows you to send a mail with user access information on a daily basis.
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### Method-1 : Shell Script to Check Successful and Failed User Login Attempts on Linux
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This script allows you to verify user access information for a given date from the terminal.
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```
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# vi /opt/scripts/user-access-details.sh
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#!/bin/bash
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echo ""
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echo -e "Enter the Date, Use Double Space for date from 1 to 9 (Nov 3) and use Single Space for date from 10 to 31 (Nov 30): \c"
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read yday
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MYPATH=/var/log/secure*
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yday=$(date --date='yesterday' | awk '{print $2,$3}')
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yday=$(date | awk '{print $2,$3}')
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tuser=$(grep "$yday" $MYPATH | grep "Accepted|Failed" | wc -l)
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suser=$(grep "$yday" $MYPATH | grep "Accepted password|Accepted publickey|keyboard-interactive" | wc -l)
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fuser=$(grep "$yday" $MYPATH | grep "Failed password" | wc -l)
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scount=$(grep "$yday" $MYPATH | grep "Accepted" | awk '{print $9;}' | sort | uniq -c)
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fcount=$(grep "$yday" $MYPATH | grep "Failed" | awk '{print $9;}' | sort | uniq -c)
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echo "--------------------------------------------"
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echo " User Access Report on: $yday"
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echo "--------------------------------------------"
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echo "Number of Users logged on System: $tuser"
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echo "Successful logins attempt: $suser"
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echo "Failed logins attempt: $fuser"
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echo "--------------------------------------------"
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echo -e "Success User Details:\n $scount"
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echo "--------------------------------------------"
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echo -e "Failed User Details:\n $fcount"
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echo "--------------------------------------------"
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```
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Set an executable **[Linux file permission][3]** to **“user-access-details-1.sh”** file.
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```
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# chmod +x /opt/scripts/user-access-details-1.sh
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```
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When you run the script you will receive an alert like the one below.
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```
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# sh /opt/scripts/user-access-details.sh
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Enter the Date, Use Double Space for date from 1 to 9 (Nov 3) and use Single Space for date from 10 to 31 (Nov 30): Nov 6
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------------------------------------------
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User Access Report on: Nov 6
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------------------------------------------
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Number of Users logged on System: 1
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Successful logins attempt: 1
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Failed logins attempt: 0
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------------------------------------------
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Success User Details:
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1 root
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------------------------------------------
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Failed User Details:
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------------------------------------------
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```
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When you run the script you will receive an alert like the one below.
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```
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# sh /opt/scripts/user-access-details.sh
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Enter the Date, Use Double Space for date from 1 to 9 (Nov 3) and use Single Space for date from 10 to 31 (Nov 30): Nov 30
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------------------------------------------
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User Access Report on: Nov 30
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------------------------------------------
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Number of Users logged on System: 20
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Successful logins attempt: 14
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Failed logins attempt: 6
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------------------------------------------
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Success User Details:
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1 daygeek
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1 root
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3 u1
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4 u2
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1 u3
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2 u4
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2 u5
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------------------------------------------
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Failed User Details:
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3 u1
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3 u4
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------------------------------------------
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```
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### Method-2 : Bash Script to Check Successful and Failed User Login Attempts With eMail Alert.
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This Bash script allows you to send a mail with user access details on a daily basis via email for yesterday’s date.
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```
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# vi /opt/scripts/user-access-details-2.sh
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#!/bin/bash
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/tmp/u-access.txt
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SUBJECT="User Access Reports on "date""
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MESSAGE="/tmp/u-access.txt"
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TO="[email protected]"
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MYPATH=/var/log/secure*
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yday=$(date --date='yesterday' | awk '{print $2,$3}')
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tuser=$(grep "$yday" $MYPATH | grep "Accepted|Failed" | wc -l)
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suser=$(grep "$yday" $MYPATH | grep "Accepted password|Accepted publickey|keyboard-interactive" | wc -l)
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fuser=$(grep "$yday" $MYPATH | grep "Failed password" | wc -l)
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scount=$(grep "$yday" $MYPATH | grep "Accepted" | awk '{print $9;}' | sort | uniq -c)
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fcount=$(grep "$yday" $MYPATH | grep "Failed" | awk '{print $9;}' | sort | uniq -c)
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echo "--------------------------------------------" >> $MESSAGE
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echo " User Access Report on: $yday" >> $MESSAGE
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echo "--------------------------------------------" >> $MESSAGE
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echo "Number of Users logged on System: $tuser" >> $MESSAGE
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echo "Successful logins attempt: $suser" >> $MESSAGE
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echo "Failed logins attempt: $fuser" >> $MESSAGE
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echo "--------------------------------------------" >> $MESSAGE
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echo -e "Success User Details:\n $scount" >> $MESSAGE
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echo "--------------------------------------------" >> $MESSAGE
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echo -e "Failed User Details:\n $fcount" >> $MESSAGE
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echo "--------------------------------------------" >> $MESSAGE
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mail -s "$SUBJECT" "$TO" < $MESSAGE
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```
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Set an executable permission to **“user-access-details-2.sh”** file.
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```
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# chmod +x /opt/scripts/user-access-details-2.sh
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```
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Finally add a **[cronjob][4]** to automate this. It will run everyday at 8’o clock.
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```
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# crontab -e
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0 8 * * * /bin/bash /opt/scripts/user-access-details-2.sh
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```
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**Note:** You will be getting an email alert everyday at 8 o’clock, which is for previous day’s user access information.
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/bash-script-to-check-successful-and-failed-user-login-attempts-on-linux/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/category/bash-script/
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[2]: https://www.2daygeek.com/category/shell-script/
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[3]: https://www.2daygeek.com/understanding-linux-file-permissions/
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[4]: https://www.2daygeek.com/linux-crontab-cron-job-to-schedule-jobs-task/
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