linux脚本登录启动失败,在Linux上检查用户登录成功与失败的shell脚本

在Linux上检查用户登录成功与失败的shell脚本

Linux管理员的典型任务之一是检查Linux系统中成功和失败的登录尝试。

手动验证它们非常困难，因为“ /var/log/secure”文件的输出看起来很尴尬。

为了使此操作更轻松，更有效，我们需要编写一个bash脚本。

是的，您可以使用以下Bash脚本实现此目的。

这些脚本将显示给定日期登录系统的用户数。此外，它显示成功的登录尝试和失败的登录尝试。

第一个外壳脚本允许您验证“ /var/log/secure”文件中可用日期的用户访问信息。

第二个shell脚本允许您每天发送包含用户访问信息的邮件。

方法1：在Linux上检查用户登录成功与失败的Shell脚本

该脚本使您可以从终端验证给定日期的用户访问信息。

# vi /opt/scripts/user-access-details.sh

#!/bin/bash

echo ""

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"

read yday

MYPATH=/var/log/secure*

tuser=$(grep "$yday" $MYPATH | grep "Accepted|Failed" | wc -l)

suser=$(grep "$yday" $MYPATH | grep "Accepted password|Accepted publickey|keyboard-interactive" | wc -l)

fuser=$(grep "$yday" $MYPATH | grep "Failed password" | wc -l)

scount=$(grep "$yday" $MYPATH | grep "Accepted" | awk '{print $9;}' | sort | uniq -c)

fcount=$(grep "$yday" $MYPATH | grep "Failed" | awk '{print $9;}' | sort | uniq -c)

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

echo " User Access Report on: $yday"

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

echo "Number of Users logged on System: $tuser"

echo "Successful logins attempt: $suser"

echo "Failed logins attempt: $fuser"

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

echo -e "Success User Details:n $scount"

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

echo -e "Failed User Details:n $fcount"

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

将可执行的Linux文件权限设置为“ user-access-details-1.sh”文件。

＃chmod +x /opt/scripts/user-access-details-1.sh

运行脚本时，您将收到类似以下的警报。

# sh /opt/scripts/user-access-details.sh

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

------------------------------------------

User Access Report on: Nov 6

------------------------------------------

Number of Users logged on System: 1

Successful logins attempt: 1

Failed logins attempt: 0

------------------------------------------

Success User Details:

1 root

------------------------------------------

Failed User Details:

------------------------------------------

运行脚本时，您将收到类似以下的警报。

# sh /opt/scripts/user-access-details.sh

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

------------------------------------------

User Access Report on: Nov 30

------------------------------------------

Number of Users logged on System: 20

Successful logins attempt: 14

Failed logins attempt: 6

------------------------------------------

Success User Details:

1 daygeek

1 root

3 u1

4 u2

1 u3

2 u4

2 u5

------------------------------------------

Failed User Details:

3 u1

3 u4

------------------------------------------

方法2：使用shell脚本通过电子邮件警报检查成功和失败的用户登录尝试。

该shell脚本允许您每天通过电子邮件发送包含用户访问详细信息的邮件，以获取昨天的日期。

# vi /opt/scripts/user-access-details-2.sh

#!/bin/bash

/tmp/u-access.txt

SUBJECT="User Access Reports on "date""

MESSAGE="/tmp/u-access.txt"

TO="daygeek@gmail.com"

MYPATH=/var/log/secure*

yday=$(date --date='yesterday' | awk '{print $2,$3}')

tuser=$(grep "$yday" $MYPATH | grep "Accepted|Failed" | wc -l)

suser=$(grep "$yday" $MYPATH | grep "Accepted password|Accepted publickey|keyboard-interactive" | wc -l)

fuser=$(grep "$yday" $MYPATH | grep "Failed password" | wc -l)

scount=$(grep "$yday" $MYPATH | grep "Accepted" | awk '{print $9;}' | sort | uniq -c)

fcount=$(grep "$yday" $MYPATH | grep "Failed" | awk '{print $9;}' | sort | uniq -c)