记录命令md5值来判断命令是否被修改

Posted 2021-03-06

使用场景：

操作系统安装完成后，执行下面脚本，记录命令的md5值，当命令被修改之后，再次使用脚本即可检查出来。

记录位置为该用户家目录下面的 .UserCheckCom.txt 文件（有个 点 ，是隐藏文件，需注意）

使用方法：

1.记录当前命令：
sh CheckCommDDCW.sh
2.记录新增命令或被修改命令(关键词add可以替换为任意非空字符串)：
sh CheckCommDDCW.sh add

代码如下：

git下载：https://codeload.github.com/ddcw/shell/zip/master

#!/bin/env bash
#write by ddcw
#https://cloud.tencent.com/developer/column/6121
#scriptname:CheckCommDDCW.sh
begintime=`date +%s`
file_name=~/.UserCheckCom.txt
new_comm_n=0
change_comm_n=0
new_comm=""
change_comm=""
[ -f ${file_name} ] || touch ${file_name}
for i in $(compgen -c)
do
    if which $i >/dev/null  2>&1 
    then
        md5_n=$(md5sum $(which $i) | awk ‘{print $1}‘)
        if  cat ${file_name} | grep "#$i#" >/dev/null  2>&1 
        then
        #   echo $(cat ${file_name} | grep "#$i#")
            md5_o=$(cat ${file_name} | grep "#$i#" | tail -1 | awk ‘{print $NF}‘)
            if [ "${md5_n}" != "${md5_o}" ]
            then
                #echo -e "COMMD 33[1;41;33m $i 33[0m may be Changed: old_MD5: ${md5_o}    new_MD5: ${md5_n}"
                [ -z $1 ] || echo -e "#${i}# 	 $(date +%Y%m%d-%H:%M:%S) 	 ${md5_n}" >> ${file_name}
                change_comm_n=$[ ${change_comm_n} + 1]
                change_comm="${change_comm}  ${i}"
            fi
        else
            if [ "${i}" != ‘[‘ ]
            then
                new_comm_n=$[ ${new_comm_n} + 1]
                new_comm="${new_comm}  ${i}"
                #echo -e "33[32;40m$i 33[0m"
                echo -e "#${i}# 	 $(date +%Y%m%d-%H:%M:%S) 	 ${md5_n}" >> ${file_name}
            fi
        fi
    fi  
done
echo ""
if [ ${new_comm_n} -gt 0 ]
then
    echo -e "33[31;40m Total Add  ${new_comm_n} commd 33[0m"
    echo "${new_comm}"
else
    echo -e "33[32;40m No Command  Added ,It‘s Seccurity!33[0m
"
fi
if [ ${change_comm_n} -gt 0 ]
then
    echo -e "33[31;40m Total Changed  ${change_comm_n} commd 33[0m"
    echo "${change_comm}"
else
    echo -e "33[32;40m No Command Changed  ,It‘s Seccurity!33[0m"
fi
endtime=`date +%s`
costm=`echo ${begintime} ${endtime} | awk ‘{print ($2-$1)/60}‘`
echo -e "
33[32;40m `date +%Y%m%d-%H:%M:%S` cost ${costm} minutes33[0m"