Linux 系统安全检查（shell）

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#!/bin/bash echo " (__)" echo " (oo)" echo " /------\/ " echo " / | || " echo " * /\---/\ " echo " ~~ ~~ " echo "Are You Ready?" read key echo "警告：本脚本只作为日常巡检使用，不会对服务器做任何修改，管理员可以根据此报告进行相应的设置。" echo ------------------------------------------------------------------------ echo "查看系统时间" DATE=`date` echo "Date is $DATE" echo ------------------------------------------------------------------------ echo "进行系统时间同步" ntpdate time.nist.gov echo ------------------------开始进行检查---------------------- echo "检查时间为" DATE=`date` echo "Date is $DATE" echo ------------------------主机基本信息检查----------------------- echo "系统版本（Centos或Rehead）" cat /etc/redhat-release echo -------------------------------------------------------------------------- echo "系统位数（32位或64位）" getconf LONG_BIT echo -------------------------检查IP信息----------------------------------------- echo "本机的ip地址是：" ifconfig | grep --color "$[0-9]\{1,3\}\.$\{3\}[0-9]\{1,3\}" echo -------------------------检查系统用户信息--------------------------------------- awk -F":" '{if($2!~/^!|^*/){print "("$1")" " 是一个未被锁定的账户，请管理员检查是否需要锁定它或者删除它。"}}' /etc/shadow echo -------------------------------------------------------------------------- more /etc/login.defs | grep -E "PASS_MAX_DAYS" | grep -v "#" |awk -F' ' '{if($2!=90){print "/etc/login.defs里面的"$1 "设置的是"$2"天，请管理员改成90天。"}}' echo -------------------------------------------------------------------------- more /etc/login.defs | grep -E "PASS_MIN_LEN" | grep -v "#" |awk -F' ' '{if($2!=6){print "/etc/login.defs里面的"$1 "设置的是"$2"个字符，请管理员改成6个字符。"}}' echo -------------------------------------------------------------------------- more /etc/login.defs | grep -E "PASS_WARN_AGE" | grep -v "#" |awk -F' ' '{if($2!=10){print "/etc/login.defs里面的"$1 "设置的是"$2"天，请管理员将口令到期警告天数改成10天。"}}' echo -------------------------------------------------------------------------- grep TMOUT /etc/profile /etc/bashrc > /dev/null|| echo "未设置登录超时限制，请设置之，设置方法：在/etc/profile或者/etc/bashrc里面添加TMOUT=600参数" echo ------------------------检查服务运行情况----------------------------------- if ps -elf |grep xinet |grep -v "grep xinet";then echo "xinetd 服务正在运行，请检查是否可以把xinnetd服务关闭" else echo "xinetd 服务未开启" fi echo -------------------------------------------------------------------------- echo "查看系统密码文件修改时间" ls -ltr /etc/passwd echo -------------------------------------------------------------------------- echo "查看是否开启了ssh服务" if service sshd status | grep -E "listening on|active $running$"; then echo "SSH服务已开启" else echo "SSH服务未开启" fi echo -------------------------------------------------------------------------- echo "查看是否开启了TELNET服务" if more /etc/xinetd.d/telnetd 2>&1|grep -E "disable=no"; then echo "TELNET服务已开启 " else echo "TELNET服务未开启 " fi echo -------------------------------------------------------------------------- echo "查看系统SSH远程访问设置策略(host.deny拒绝列表)" if more /etc/hosts.deny | grep -E "sshd: ";more /etc/hosts.deny | grep -E "sshd"; then echo "远程访问策略已设置 " else echo "远程访问策略未设置 " fi echo -------------------------------------------------------------------------- echo "查看系统SSH远程访问设置策略(hosts.allow允许列表)" if more /etc/hosts.allow | grep -E "sshd: ";more /etc/hosts.allow | grep -E "sshd"; then echo "远程访问策略已设置 " else echo "远程访问策略未设置 " fi echo "当hosts.allow和 host.deny相冲突时，以hosts.allow设置为准。" echo ------------------------------------------------------------------------- echo "查看shell是否设置超时锁定策略" if more /etc/profile | grep -E "TIMEOUT= "; then echo "系统设置了超时锁定策略 " else echo "未设置超时锁定策略 " fi echo ------------------------------------------------------------------------- echo "查看syslog日志审计服务是否开启" if service syslog status | egrep " active \(running";then echo "syslog服务已开启" else echo "syslog服务未开启，建议通过service syslog start开启日志审计功能" fi echo ------------------------------------------------------------------------- echo "查看syslog日志是否开启外发" if more /etc/rsyslog.conf | egrep "@...\.|@..\.|@.\.|\*.\* @...\.|\*\.\* @..\.|\*\.\* @.\.";then echo "客户端syslog日志已开启外发" else echo "客户端syslog日志未开启外发" fi echo ------------------------------------------------------------------------- echo "查看passwd文件中有哪些特权用户" awk -F: '$3==0 {print $1}' /etc/passwd echo ------------------------------------------------------------------------ echo "查看系统中是否存在空口令账户" awk -F: '($2=="!!") {print $1}' /etc/shadow echo "该结果不适用于Ubuntu系统" echo ------------------------------------------------------------------------ echo "查看系统中root用户外连情况" lsof -u root |egrep "ESTABLISHED|SYN_SENT|LISTENING" echo ----------------------------状态解释------------------------------ echo "ESTABLISHED的意思是建立连接。表示两台机器正在通信。" echo "LISTENING的" echo "SYN_SENT状态表示请求连接" echo ------------------------------------------------------------------------ echo "查看系统中root用户TCP连接情况" lsof -u root |egrep "TCP" echo ------------------------------------------------------------------------ echo "查看系统中存在哪些非系统默认用户" echo "root:x:“该值大于500为新创建用户，小于或等于500为系统初始用户”" more /etc/passwd |awk -F ":" '{if($3>500){print "/etc/passwd里面的"$1 "的值为"$3"，请管理员确认该账户是否正常。"}}' echo ------------------------------------------------------------------------ echo "检查系统守护进程" more /etc/xinetd.d/rsync | grep -v "^#" echo ------------------------------------------------------------------------ echo "检查系统是否存在入侵行为" more /var/log/secure |grep refused echo ------------------------------------------------------------------------ echo "-----------------------检查系统是否存在PHP脚本后门---------------------" if find / -type f -name *.php | xargs egrep -l "mysql_query$$query, $dbconn$|专用网马|udf.dll|class PHPzip\{|ZIP压缩程序荒野无灯修改版|$writabledb|AnonymousUserName|eval$|Root_CSS\($|黑狼PHP木马|eval$gzuncompress\(base64_decode|if\(empty\($_SESSION|$shellname|$work_dir |PHP木马|Array\("$filename"| eval\($_POST\[|class packdir|disk_total_space|wscript.shell|cmd.exe|shell.application|documents and settings|system32|serv-u|提权|phpspy|后门" |sort -n|uniq -c |sort -rn 1>/dev/null 2>&1;then echo "检测到PHP脚本后门" find / -type f -name *.php | xargs egrep -l "mysql_query\($query, $dbconn$|专用网马|udf.dll|class PHPzip\{|ZIP压缩程序荒野无灯修改版|$writabledb|AnonymousUserName|eval$|Root_CSS\($|黑狼PHP木马|eval$gzuncompress\(base64_decode|if\(empty\($_SESSION|$shellname|$work_dir |PHP木马|Array\("$filename"| eval\($_POST\[|class packdir|disk_total_space|wscript.shell|cmd.exe|shell.application|documents and settings|system32|serv-u|提权|phpspy|后门" |sort -n|uniq -c |sort -rn find / -type f -name *.php | xargs egrep -l "mysql_query\($query, $dbconn$|专用网马|udf.dll|class PHPzip\{|ZIP压缩程序荒野无灯修改版|$writabledb|AnonymousUserName|eval$|Root_CSS\($|黑狼PHP木马|eval$gzuncompress\(base64_decode|if\(empty\($_SESSION|$shellname|$work_dir |PHP木马|Array\("$filename"| eval\($_POST\[|class packdir|disk_total_space|wscript.shell|cmd.exe|shell.application|documents and settings|system32|serv-u|提权|phpspy|后门" |sort -n|uniq -c |sort -rn |awk '{print $2}' | xargs -I{} cp {} /tmp/ echo "后门样本已拷贝到/tmp/目录" else echo "未检测到PHP脚本后门" fi echo ------------------------------------------------------------------------ echo "-----------------------检查系统是否存在JSP脚本后门---------------------" find / -type f -name *.jsp | xargs egrep -l "InputStreamReader\(this.is$|W_SESSION_ATTRIBUTE|strFileManag|getHostAddress|wscript.shell|gethostbyname|cmd.exe|documents and settings|system32|serv-u|提权|jspspy|后门" |sort -n|uniq -c |sort -rn 2>&1 find / -type f -name *.jsp | xargs egrep -l "InputStreamReader$this.is$|W_SESSION_ATTRIBUTE|strFileManag|getHostAddress|wscript.shell|gethostbyname|cmd.exe|documents and settings|system32|serv-u|提权|jspspy|后门" |sort -n|uniq -c |sort -rn| awk '{print $2}' | xargs -I{} cp {} /tmp/ 2>&1 echo ------------------------------------------------------------------------ echo "----------------------检查系统是否存在HTML恶意代码---------------------" if find / -type f -name *.html | xargs egrep -l "WriteData|svchost.exe|DropPath|wsh.Run|WindowBomb|a1.createInstance|CurrentVersion|myEncString|DropFileName|a = prototype;|204.351.440.495.232.315.444.550.64.330" 1>/dev/null 2>&1;then echo "发现HTML恶意代码" find / -type f -name *.html | xargs egrep -l "WriteData|svchost.exe|DropPath|wsh.Run|WindowBomb|a1.createInstance|CurrentVersion|myEncString|DropFileName|a = prototype;|204.351.440.495.232.315.444.550.64.330" |sort -n|uniq -c |sort -rn find / -type f -name *.html | xargs egrep -l "WriteData|svchost.exe|DropPath|wsh.Run|WindowBomb|a1.createInstance|CurrentVersion|myEncString|DropFileName|a = prototype;|204.351.440.495.232.315.444.550.64.330" |sort -n|uniq -c |sort -rn| awk '{print $2}' | xargs -I{} cp {} /tmp/ echo "后门样本已拷贝到/tmp/目录" else echo "未检测到HTML恶意代码" fi echo "----------------------检查系统是否存在perl恶意程序----------------------" if find / -type f -name *.pl | xargs egrep -l "SHELLPASSWORD|shcmd|backdoor|setsockopt|IO::Socket::INET;" 1>/dev/null 2>&1;then echo "发现perl恶意程序" find / -type f -name *.pl | xargs egrep -l "SHELLPASSWORD|shcmd|backdoor|setsockopt|IO::Socket::INET;"|sort -n|uniq -c |sort -rn find / -type f -name *.pl | xargs egrep -l "SHELLPASSWORD|shcmd|backdoor|setsockopt|IO::Socket::INET;"|sort -n|uniq -c |sort -rn| awk '{print $2}' | xargs -I{} cp {} /tmp/ echo "可疑样本已拷贝到/tmp/目录" else echo "未检测到perl恶意程序" fi echo "----------------------检查系统是否存在Python恶意程序----------------------" find / -type f -name *.py | xargs egrep -l "execCmd|cat /etc/issue|getAppProc|exploitdb" |sort -n|uniq -c |sort -rn find / -type f -name *.py | xargs egrep -l "execCmd|cat /etc/issue|getAppProc|exploitdb" |sort -n|uniq -c |sort -rn| awk '{print $2}' | xargs -I{} cp {} /tmp/ echo ------------------------------------------------------------------------ echo "-----------------------检查系统是否存在恶意程序---------------------" find / -type f -perm -111 |xargs egrep "UpdateProcessER12CUpdateGatesE6C|CmdMsg\.cpp|MiniHttpHelper.cpp|y4'r3 1uCky k1d\!|execve@@GLIBC_2.0|initfini.c|ptmalloc_unlock_all2|_IO_wide_data_2|system@@GLIBC_2.0|socket@@GLIBC_2.0|gettimeofday@@GLIBC_2.0|execl@@GLIBC_2.2.5|WwW.SoQoR.NeT|2.6.17-2.6.24.1.c|Local Root Exploit|close@@GLIBC_2.0|syscall\(\__NR\_vmsplice,|Linux vmsplice Local Root Exploit|It looks like the exploit failed|getting root shell" 2>/dev/null echo ------------------------------------------------------------------------ echo "检查网络连接和监听端口" netstat -an echo "--------------------------路由表、网络连接、接口信息--------------" netstat -rn echo "------------------------查看网卡详细信息--------------------------" ifconfig -a echo ------------------------------------------------------------------------ echo "查看正常情况下登录到本机的所有用户的历史记录" last echo ------------------------------------------------------------------------ echo "检查系统中core文件是否开启" ulimit -c echo "core是unix系统的内核。当你的程序出现内存越界的时候,操作系统会中止你的进程,并将当前内存状态倒出到core文件中,以便进一步分析，如果返回结果为0，则是关闭了此功能，系统不会生成core文件" echo ------------------------------------------------------------------------ echo "检查系统中关键文件修改时间" ls -ltr /bin/ls /bin/login /etc/passwd /bin/ps /usr/bin/top /etc/shadow|awk '{print "文件名："$8" ""最后修改时间："$6" "$7}' echo "ls文件：是存储ls命令的功能函数，被删除以后，就无法执行ls命令，黑客可利用篡改ls文件来执行后门或其他程序。 login文件：login是控制用户登录的文件，一旦被篡改或删除，系统将无法切换用户或登陆用户 user/bin/passwd是一个命令，可以为用户添加、更改密码，但是，用户的密码并不保存在/etc/passwd当中，而是保存在了/etc/shadow当中 etc/passwd是一个文件，主要是保存用户信息。 sbin/portmap是文件转换服务，缺少该文件后，无法使用磁盘挂载、转换类型等功能。 bin/ps 进程查看命令功能支持文件，文件损坏或被更改后，无法正常使用ps命令。 usr/bin/top top命令支持文件，是Linux下常用的性能分析工具,能够实时显示系统中各个进程的资源占用状况。 etc/shadow shadow 是 /etc/passwd 的影子文件，密码存放在该文件当中，并且只有root用户可读。" echo -------------------------------------------------------------------------- echo "-------------------查看系统日志文件是否存在--------------------" log=/var/log/syslog log2=/var/log/messages if [ -e "$log" ]; then echo "syslog日志文件存在！ " else echo "/var/log/syslog日志文件不存在！ " fi if [ -e "$log2" ]; then echo "/var/log/messages日志文件存在！ " else echo "/var/log/messages日志文件不存在！ " fi echo -------------------------------------------------------------------------- echo "检查系统文件完整性2(MD5检查)" echo "该项会获取部分关键文件的MD5值并入库，默认保存在/etc/md5db中" echo "如果第一次执行，则会提示md5sum: /sbin/portmap: 没有那个文件或目录" echo "第二次重复检查时，则会对MD5DB中的MD5值进行匹配，来判断文件是否被更改过" file="/etc/md5db" if [ -e "$file" ]; then md5sum -c /etc/md5db 2>&1; else md5sum /etc/passwd >>/etc/md5db md5sum /etc/shadow >>/etc/md5db md5sum /etc/group >>/etc/md5db md5sum /usr/bin/passwd >>/etc/md5db md5sum /sbin/portmap>>/etc/md5db md5sum /bin/login >>/etc/md5db md5sum /bin/ls >>/etc/md5db md5sum /bin/ps >>/etc/md5db md5sum /usr/bin/top >>/etc/md5db; fi echo ---------------------------------------------------------------------- echo "------------------------主机性能检查--------------------------------" echo "CPU检查" dmesg | grep -i cpu echo ----------------------------------------------------------------------- more /proc/cpuinfo echo ----------------------------------------------------------------------- echo "内存状态检查" vmstat 2 5 echo ----------------------------------------------------------------------- more /proc/meminfo echo ----------------------------------------------------------------------- free -m echo ----------------------------------------------------------------------- echo "文件系统使用情况" df -h echo ----------------------------------------------------------------------- echo "网卡使用情况" lspci -tv echo ---------------------------------------------------------------------- echo "查看僵尸进程" ps -ef | grep zombie echo ---------------------------------------------------------------------- echo "耗CPU最多的进程" ps auxf |sort -nr -k 3 |head -5 echo ---------------------------------------------------------------------- echo "耗内存最多的进程" ps auxf |sort -nr -k 4 |head -5 echo ---------------------------------------------------------------------- echo --------------------------------------------------------------------- echo "COPY RIGHT " echo "QQ：" echo ----------------------结束时间为------------------------------------- DATE=`date` echo "Date is $DATE" echo ----------------------------------------------------------------------

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